./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.04.cil-2.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_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/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_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.04.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/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_2d13a15e-0cda-4465-8de6-be001a2df753/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 a61ec0d9e8ff01aa8900ac2d4a87b40f68db963fb1a53c6fbb2c11c91e3dd345 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:11:18,257 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:11:18,259 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:11:18,296 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:11:18,296 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:11:18,298 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:11:18,300 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:11:18,302 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:11:18,305 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:11:18,306 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:11:18,307 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:11:18,309 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:11:18,309 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:11:18,310 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:11:18,312 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:11:18,313 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:11:18,314 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:11:18,315 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:11:18,317 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:11:18,320 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:11:18,321 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:11:18,323 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:11:18,330 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:11:18,331 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:11:18,334 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:11:18,335 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:11:18,335 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:11:18,336 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:11:18,337 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:11:18,338 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:11:18,338 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:11:18,339 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:11:18,340 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:11:18,341 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:11:18,342 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:11:18,342 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:11:18,343 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:11:18,343 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:11:18,344 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:11:18,345 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:11:18,345 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:11:18,346 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:11:18,373 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:11:18,373 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:11:18,373 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:11:18,374 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:11:18,374 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:11:18,375 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:11:18,375 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:11:18,375 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:11:18,375 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:11:18,375 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:11:18,375 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:11:18,376 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:11:18,376 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:11:18,376 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:11:18,376 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:11:18,376 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:11:18,377 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:11:18,377 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:11:18,378 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:11:18,378 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:11:18,378 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:11:18,378 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:11:18,378 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:11:18,379 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:11:18,379 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:11:18,379 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:11:18,379 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:11:18,379 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:11:18,379 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:11:18,380 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:11:18,380 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:11:18,380 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:11:18,380 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:11:18,381 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:11:18,381 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:11:18,381 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:11:18,381 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:11:18,381 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:11:18,382 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:11:18,382 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:11:18,382 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:11:18,382 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_2d13a15e-0cda-4465-8de6-be001a2df753/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a61ec0d9e8ff01aa8900ac2d4a87b40f68db963fb1a53c6fbb2c11c91e3dd345 [2021-11-23 02:11:18,628 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:11:18,655 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:11:18,659 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:11:18,660 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:11:18,661 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:11:18,662 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.04.cil-2.c [2021-11-23 02:11:18,763 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/data/bf9c03971/ef5787881aff4119910729067e78b4a4/FLAG2b8d76751 [2021-11-23 02:11:19,268 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:11:19,268 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.04.cil-2.c [2021-11-23 02:11:19,280 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/data/bf9c03971/ef5787881aff4119910729067e78b4a4/FLAG2b8d76751 [2021-11-23 02:11:19,607 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/data/bf9c03971/ef5787881aff4119910729067e78b4a4 [2021-11-23 02:11:19,610 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:11:19,611 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:11:19,613 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:11:19,613 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:11:19,617 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:11:19,617 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:11:19" (1/1) ... [2021-11-23 02:11:19,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22c8d81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:19, skipping insertion in model container [2021-11-23 02:11:19,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:11:19" (1/1) ... [2021-11-23 02:11:19,627 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:11:19,676 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:11:19,840 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_2d13a15e-0cda-4465-8de6-be001a2df753/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.04.cil-2.c[914,927] [2021-11-23 02:11:19,897 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_2d13a15e-0cda-4465-8de6-be001a2df753/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.04.cil-2.c[7115,7128] [2021-11-23 02:11:19,989 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:11:20,015 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:11:20,038 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_2d13a15e-0cda-4465-8de6-be001a2df753/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.04.cil-2.c[914,927] [2021-11-23 02:11:20,089 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_2d13a15e-0cda-4465-8de6-be001a2df753/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.04.cil-2.c[7115,7128] [2021-11-23 02:11:20,122 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:11:20,144 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:11:20,145 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20 WrapperNode [2021-11-23 02:11:20,145 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:11:20,146 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:11:20,147 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:11:20,147 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:11:20,157 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,172 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,220 INFO L137 Inliner]: procedures = 61, calls = 70, calls flagged for inlining = 29, calls inlined = 29, statements flattened = 581 [2021-11-23 02:11:20,226 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:11:20,227 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:11:20,227 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:11:20,228 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:11:20,238 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,238 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,247 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,258 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,271 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,305 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,324 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,330 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:11:20,339 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:11:20,340 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:11:20,340 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:11:20,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (1/1) ... [2021-11-23 02:11:20,350 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:11:20,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:11:20,376 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:11:20,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:11:20,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:11:20,431 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:11:20,431 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:11:20,431 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2021-11-23 02:11:20,431 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2021-11-23 02:11:20,432 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2021-11-23 02:11:20,432 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2021-11-23 02:11:20,432 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2021-11-23 02:11:20,432 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2021-11-23 02:11:20,433 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2021-11-23 02:11:20,433 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2021-11-23 02:11:20,433 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2021-11-23 02:11:20,434 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2021-11-23 02:11:20,434 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2021-11-23 02:11:20,434 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2021-11-23 02:11:20,434 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2021-11-23 02:11:20,434 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2021-11-23 02:11:20,434 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2021-11-23 02:11:20,435 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2021-11-23 02:11:20,435 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2021-11-23 02:11:20,435 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2021-11-23 02:11:20,435 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2021-11-23 02:11:20,435 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2021-11-23 02:11:20,435 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:11:20,436 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2021-11-23 02:11:20,436 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2021-11-23 02:11:20,436 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2021-11-23 02:11:20,436 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2021-11-23 02:11:20,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:11:20,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:11:20,437 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2021-11-23 02:11:20,437 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2021-11-23 02:11:20,437 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2021-11-23 02:11:20,438 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2021-11-23 02:11:20,594 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:11:20,596 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:11:21,279 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:11:21,672 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:11:21,672 INFO L301 CfgBuilder]: Removed 11 assume(true) statements. [2021-11-23 02:11:21,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:11:21 BoogieIcfgContainer [2021-11-23 02:11:21,675 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:11:21,677 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:11:21,677 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:11:21,682 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:11:21,682 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:11:19" (1/3) ... [2021-11-23 02:11:21,684 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2183e882 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:11:21, skipping insertion in model container [2021-11-23 02:11:21,684 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:11:20" (2/3) ... [2021-11-23 02:11:21,685 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2183e882 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:11:21, skipping insertion in model container [2021-11-23 02:11:21,686 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:11:21" (3/3) ... [2021-11-23 02:11:21,687 INFO L111 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1+token_ring.04.cil-2.c [2021-11-23 02:11:21,696 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:11:21,696 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:11:21,751 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:11:21,758 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 02:11:21,758 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:11:21,791 INFO L276 IsEmpty]: Start isEmpty. Operand has 178 states, 126 states have (on average 1.5158730158730158) internal successors, (191), 134 states have internal predecessors, (191), 34 states have call successors, (34), 15 states have call predecessors, (34), 15 states have return successors, (34), 32 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:11:21,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 02:11:21,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:21,804 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:21,804 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:21,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:21,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1303704914, now seen corresponding path program 1 times [2021-11-23 02:11:21,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:21,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237578601] [2021-11-23 02:11:21,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:21,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:21,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:22,115 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 02:11:22,116 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:22,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237578601] [2021-11-23 02:11:22,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237578601] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:22,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:22,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:11:22,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621558718] [2021-11-23 02:11:22,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:22,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:11:22,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:22,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:11:22,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:11:22,157 INFO L87 Difference]: Start difference. First operand has 178 states, 126 states have (on average 1.5158730158730158) internal successors, (191), 134 states have internal predecessors, (191), 34 states have call successors, (34), 15 states have call predecessors, (34), 15 states have return successors, (34), 32 states have call predecessors, (34), 34 states have call successors, (34) Second operand has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:11:22,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:22,872 INFO L93 Difference]: Finished difference Result 412 states and 586 transitions. [2021-11-23 02:11:22,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:11:22,874 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-11-23 02:11:22,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:22,896 INFO L225 Difference]: With dead ends: 412 [2021-11-23 02:11:22,896 INFO L226 Difference]: Without dead ends: 237 [2021-11-23 02:11:22,904 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:11:22,909 INFO L933 BasicCegarLoop]: 189 mSDtfsCounter, 386 mSDsluCounter, 623 mSDsCounter, 0 mSdLazyCounter, 597 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 410 SdHoareTripleChecker+Valid, 704 SdHoareTripleChecker+Invalid, 714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:22,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [410 Valid, 704 Invalid, 714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 597 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:11:22,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-11-23 02:11:23,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 224. [2021-11-23 02:11:23,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 160 states have (on average 1.4125) internal successors, (226), 165 states have internal predecessors, (226), 42 states have call successors, (42), 22 states have call predecessors, (42), 20 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-23 02:11:23,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 306 transitions. [2021-11-23 02:11:23,014 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 306 transitions. Word has length 45 [2021-11-23 02:11:23,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:23,015 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 306 transitions. [2021-11-23 02:11:23,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:11:23,016 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 306 transitions. [2021-11-23 02:11:23,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:11:23,025 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:23,025 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:23,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:11:23,026 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:23,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:23,030 INFO L85 PathProgramCache]: Analyzing trace with hash 812664828, now seen corresponding path program 1 times [2021-11-23 02:11:23,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:23,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395801694] [2021-11-23 02:11:23,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:23,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:23,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:23,176 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 02:11:23,177 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:23,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395801694] [2021-11-23 02:11:23,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395801694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:23,178 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:23,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:11:23,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857182080] [2021-11-23 02:11:23,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:23,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:11:23,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:23,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:11:23,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:11:23,188 INFO L87 Difference]: Start difference. First operand 224 states and 306 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:11:23,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:23,302 INFO L93 Difference]: Finished difference Result 449 states and 593 transitions. [2021-11-23 02:11:23,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:11:23,303 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 46 [2021-11-23 02:11:23,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:23,310 INFO L225 Difference]: With dead ends: 449 [2021-11-23 02:11:23,310 INFO L226 Difference]: Without dead ends: 333 [2021-11-23 02:11:23,318 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 02:11:23,320 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 217 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:23,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 272 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:11:23,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2021-11-23 02:11:23,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 319. [2021-11-23 02:11:23,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 225 states have (on average 1.36) internal successors, (306), 230 states have internal predecessors, (306), 58 states have call successors, (58), 36 states have call predecessors, (58), 34 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-23 02:11:23,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 418 transitions. [2021-11-23 02:11:23,389 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 418 transitions. Word has length 46 [2021-11-23 02:11:23,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:23,390 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 418 transitions. [2021-11-23 02:11:23,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:11:23,392 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 418 transitions. [2021-11-23 02:11:23,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 02:11:23,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:23,397 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:23,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:11:23,397 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:23,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:23,398 INFO L85 PathProgramCache]: Analyzing trace with hash 1468698462, now seen corresponding path program 1 times [2021-11-23 02:11:23,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:23,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028241606] [2021-11-23 02:11:23,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:23,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:23,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:23,528 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 02:11:23,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:23,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028241606] [2021-11-23 02:11:23,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028241606] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:23,530 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:23,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:11:23,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242687846] [2021-11-23 02:11:23,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:23,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:11:23,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:23,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:11:23,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:11:23,534 INFO L87 Difference]: Start difference. First operand 319 states and 418 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:11:24,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:24,117 INFO L93 Difference]: Finished difference Result 767 states and 1117 transitions. [2021-11-23 02:11:24,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:11:24,118 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 44 [2021-11-23 02:11:24,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:24,124 INFO L225 Difference]: With dead ends: 767 [2021-11-23 02:11:24,124 INFO L226 Difference]: Without dead ends: 669 [2021-11-23 02:11:24,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:11:24,126 INFO L933 BasicCegarLoop]: 347 mSDtfsCounter, 713 mSDsluCounter, 529 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 722 SdHoareTripleChecker+Valid, 774 SdHoareTripleChecker+Invalid, 626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:24,127 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [722 Valid, 774 Invalid, 626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:11:24,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 669 states. [2021-11-23 02:11:24,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 669 to 656. [2021-11-23 02:11:24,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 656 states, 485 states have (on average 1.4061855670103092) internal successors, (682), 493 states have internal predecessors, (682), 111 states have call successors, (111), 60 states have call predecessors, (111), 58 states have return successors, (137), 104 states have call predecessors, (137), 107 states have call successors, (137) [2021-11-23 02:11:24,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656 states to 656 states and 930 transitions. [2021-11-23 02:11:24,184 INFO L78 Accepts]: Start accepts. Automaton has 656 states and 930 transitions. Word has length 44 [2021-11-23 02:11:24,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:24,184 INFO L470 AbstractCegarLoop]: Abstraction has 656 states and 930 transitions. [2021-11-23 02:11:24,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:11:24,185 INFO L276 IsEmpty]: Start isEmpty. Operand 656 states and 930 transitions. [2021-11-23 02:11:24,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:11:24,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:24,186 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:24,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:11:24,187 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:24,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:24,187 INFO L85 PathProgramCache]: Analyzing trace with hash -1722193966, now seen corresponding path program 1 times [2021-11-23 02:11:24,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:24,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935811681] [2021-11-23 02:11:24,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:24,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:24,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:24,230 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 02:11:24,230 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:24,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935811681] [2021-11-23 02:11:24,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935811681] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:24,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:24,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:11:24,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934469305] [2021-11-23 02:11:24,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:24,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:11:24,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:24,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:11:24,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:11:24,233 INFO L87 Difference]: Start difference. First operand 656 states and 930 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:11:24,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:24,351 INFO L93 Difference]: Finished difference Result 1020 states and 1378 transitions. [2021-11-23 02:11:24,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:11:24,352 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2021-11-23 02:11:24,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:24,359 INFO L225 Difference]: With dead ends: 1020 [2021-11-23 02:11:24,359 INFO L226 Difference]: Without dead ends: 810 [2021-11-23 02:11:24,360 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 02:11:24,362 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 68 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:24,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 392 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:11:24,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2021-11-23 02:11:24,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 806. [2021-11-23 02:11:24,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 806 states, 590 states have (on average 1.3847457627118644) internal successors, (817), 598 states have internal predecessors, (817), 135 states have call successors, (135), 81 states have call predecessors, (135), 79 states have return successors, (161), 128 states have call predecessors, (161), 131 states have call successors, (161) [2021-11-23 02:11:24,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 806 states to 806 states and 1113 transitions. [2021-11-23 02:11:24,423 INFO L78 Accepts]: Start accepts. Automaton has 806 states and 1113 transitions. Word has length 47 [2021-11-23 02:11:24,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:24,424 INFO L470 AbstractCegarLoop]: Abstraction has 806 states and 1113 transitions. [2021-11-23 02:11:24,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:11:24,424 INFO L276 IsEmpty]: Start isEmpty. Operand 806 states and 1113 transitions. [2021-11-23 02:11:24,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 02:11:24,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:24,426 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:24,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:11:24,427 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:24,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:24,427 INFO L85 PathProgramCache]: Analyzing trace with hash 829797201, now seen corresponding path program 1 times [2021-11-23 02:11:24,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:24,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25936667] [2021-11-23 02:11:24,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:24,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:24,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:24,498 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 02:11:24,500 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:24,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25936667] [2021-11-23 02:11:24,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25936667] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:24,501 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:24,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:11:24,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195435585] [2021-11-23 02:11:24,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:24,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:11:24,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:24,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:11:24,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:11:24,504 INFO L87 Difference]: Start difference. First operand 806 states and 1113 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:11:24,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:24,641 INFO L93 Difference]: Finished difference Result 1230 states and 1635 transitions. [2021-11-23 02:11:24,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:11:24,642 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 53 [2021-11-23 02:11:24,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:24,650 INFO L225 Difference]: With dead ends: 1230 [2021-11-23 02:11:24,650 INFO L226 Difference]: Without dead ends: 869 [2021-11-23 02:11:24,652 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 02:11:24,654 INFO L933 BasicCegarLoop]: 217 mSDtfsCounter, 217 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 279 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 02:11:24,655 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 279 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:11:24,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 869 states. [2021-11-23 02:11:24,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 869 to 857. [2021-11-23 02:11:24,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 857 states, 626 states have (on average 1.3722044728434504) internal successors, (859), 634 states have internal predecessors, (859), 143 states have call successors, (143), 88 states have call predecessors, (143), 86 states have return successors, (169), 136 states have call predecessors, (169), 139 states have call successors, (169) [2021-11-23 02:11:24,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 857 states to 857 states and 1171 transitions. [2021-11-23 02:11:24,735 INFO L78 Accepts]: Start accepts. Automaton has 857 states and 1171 transitions. Word has length 53 [2021-11-23 02:11:24,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:24,736 INFO L470 AbstractCegarLoop]: Abstraction has 857 states and 1171 transitions. [2021-11-23 02:11:24,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:11:24,736 INFO L276 IsEmpty]: Start isEmpty. Operand 857 states and 1171 transitions. [2021-11-23 02:11:24,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:11:24,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:24,738 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, 1, 1, 1, 1, 1] [2021-11-23 02:11:24,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:11:24,738 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:24,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:24,739 INFO L85 PathProgramCache]: Analyzing trace with hash -562461094, now seen corresponding path program 1 times [2021-11-23 02:11:24,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:24,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617293789] [2021-11-23 02:11:24,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:24,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:24,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:24,782 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:24,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:24,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617293789] [2021-11-23 02:11:24,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [617293789] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:24,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:11:24,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:11:24,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523223385] [2021-11-23 02:11:24,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:24,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:11:24,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:24,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:11:24,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:11:24,784 INFO L87 Difference]: Start difference. First operand 857 states and 1171 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 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 02:11:25,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:25,016 INFO L93 Difference]: Finished difference Result 966 states and 1303 transitions. [2021-11-23 02:11:25,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:11:25,017 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 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 54 [2021-11-23 02:11:25,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:25,023 INFO L225 Difference]: With dead ends: 966 [2021-11-23 02:11:25,023 INFO L226 Difference]: Without dead ends: 963 [2021-11-23 02:11:25,024 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 02:11:25,025 INFO L933 BasicCegarLoop]: 214 mSDtfsCounter, 392 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 392 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:25,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [392 Valid, 258 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:11:25,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 963 states. [2021-11-23 02:11:25,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 963 to 856. [2021-11-23 02:11:25,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 856 states, 626 states have (on average 1.3674121405750799) internal successors, (856), 633 states have internal predecessors, (856), 142 states have call successors, (142), 88 states have call predecessors, (142), 86 states have return successors, (169), 136 states have call predecessors, (169), 139 states have call successors, (169) [2021-11-23 02:11:25,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 856 states to 856 states and 1167 transitions. [2021-11-23 02:11:25,095 INFO L78 Accepts]: Start accepts. Automaton has 856 states and 1167 transitions. Word has length 54 [2021-11-23 02:11:25,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:25,096 INFO L470 AbstractCegarLoop]: Abstraction has 856 states and 1167 transitions. [2021-11-23 02:11:25,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 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 02:11:25,096 INFO L276 IsEmpty]: Start isEmpty. Operand 856 states and 1167 transitions. [2021-11-23 02:11:25,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 02:11:25,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:25,098 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, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:25,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:11:25,098 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:25,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:25,099 INFO L85 PathProgramCache]: Analyzing trace with hash -257299269, now seen corresponding path program 1 times [2021-11-23 02:11:25,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:25,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011865421] [2021-11-23 02:11:25,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:25,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:25,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:25,177 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:25,177 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:25,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011865421] [2021-11-23 02:11:25,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011865421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:11:25,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568973921] [2021-11-23 02:11:25,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:25,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:25,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:11:25,180 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:11:25,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:11:25,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:25,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:11:25,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:25,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:25,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:26,101 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:26,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568973921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:26,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1106452470] [2021-11-23 02:11:26,124 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2021-11-23 02:11:26,125 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:11:26,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:11:26,138 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:11:26,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:11:29,814 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 125 for LOIs [2021-11-23 02:11:29,841 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 121 for LOIs [2021-11-23 02:11:29,867 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 129 for LOIs [2021-11-23 02:11:30,350 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 125 for LOIs [2021-11-23 02:11:30,417 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 125 for LOIs [2021-11-23 02:11:30,484 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 125 for LOIs [2021-11-23 02:11:30,509 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 132 for LOIs [2021-11-23 02:11:30,534 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:11:43,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1106452470] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:43,776 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:11:43,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [5, 5, 4] total 44 [2021-11-23 02:11:43,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523101847] [2021-11-23 02:11:43,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:43,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 02:11:43,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:43,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 02:11:43,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=1682, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:11:43,779 INFO L87 Difference]: Start difference. First operand 856 states and 1167 transitions. Second operand has 39 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 02:12:01,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:01,820 INFO L93 Difference]: Finished difference Result 1315 states and 1714 transitions. [2021-11-23 02:12:01,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 02:12:01,833 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 55 [2021-11-23 02:12:01,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:01,840 INFO L225 Difference]: With dead ends: 1315 [2021-11-23 02:12:01,841 INFO L226 Difference]: Without dead ends: 905 [2021-11-23 02:12:01,844 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1534 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=620, Invalid=4492, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:12:01,845 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 159 mSDsluCounter, 2510 mSDsCounter, 0 mSdLazyCounter, 4713 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 2596 SdHoareTripleChecker+Invalid, 4890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 4713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:01,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 2596 Invalid, 4890 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [177 Valid, 4713 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2021-11-23 02:12:01,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 905 states. [2021-11-23 02:12:01,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 905 to 890. [2021-11-23 02:12:01,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 890 states, 652 states have (on average 1.3558282208588956) internal successors, (884), 659 states have internal predecessors, (884), 144 states have call successors, (144), 94 states have call predecessors, (144), 92 states have return successors, (171), 138 states have call predecessors, (171), 141 states have call successors, (171) [2021-11-23 02:12:01,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 890 states to 890 states and 1199 transitions. [2021-11-23 02:12:01,918 INFO L78 Accepts]: Start accepts. Automaton has 890 states and 1199 transitions. Word has length 55 [2021-11-23 02:12:01,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:01,919 INFO L470 AbstractCegarLoop]: Abstraction has 890 states and 1199 transitions. [2021-11-23 02:12:01,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 02:12:01,919 INFO L276 IsEmpty]: Start isEmpty. Operand 890 states and 1199 transitions. [2021-11-23 02:12:01,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:12:01,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:01,921 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:12:01,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:02,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 02:12:02,137 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:02,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:02,138 INFO L85 PathProgramCache]: Analyzing trace with hash -802950204, now seen corresponding path program 1 times [2021-11-23 02:12:02,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:02,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802050784] [2021-11-23 02:12:02,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:02,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:02,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:02,195 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:12:02,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:02,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802050784] [2021-11-23 02:12:02,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802050784] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:02,195 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:02,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:02,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387970540] [2021-11-23 02:12:02,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:02,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:02,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:02,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:02,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:02,196 INFO L87 Difference]: Start difference. First operand 890 states and 1199 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 02:12:02,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:02,331 INFO L93 Difference]: Finished difference Result 1341 states and 1755 transitions. [2021-11-23 02:12:02,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:02,331 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 61 [2021-11-23 02:12:02,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:02,339 INFO L225 Difference]: With dead ends: 1341 [2021-11-23 02:12:02,339 INFO L226 Difference]: Without dead ends: 1073 [2021-11-23 02:12:02,340 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 02:12:02,341 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 44 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 439 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:02,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 439 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:02,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1073 states. [2021-11-23 02:12:02,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1073 to 944. [2021-11-23 02:12:02,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 944 states, 696 states have (on average 1.3548850574712643) internal successors, (943), 703 states have internal predecessors, (943), 149 states have call successors, (149), 99 states have call predecessors, (149), 97 states have return successors, (176), 143 states have call predecessors, (176), 146 states have call successors, (176) [2021-11-23 02:12:02,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 944 states to 944 states and 1268 transitions. [2021-11-23 02:12:02,434 INFO L78 Accepts]: Start accepts. Automaton has 944 states and 1268 transitions. Word has length 61 [2021-11-23 02:12:02,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:02,434 INFO L470 AbstractCegarLoop]: Abstraction has 944 states and 1268 transitions. [2021-11-23 02:12:02,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 02:12:02,435 INFO L276 IsEmpty]: Start isEmpty. Operand 944 states and 1268 transitions. [2021-11-23 02:12:02,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 02:12:02,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:02,437 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] [2021-11-23 02:12:02,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:12:02,438 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:02,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:02,438 INFO L85 PathProgramCache]: Analyzing trace with hash -926220964, now seen corresponding path program 1 times [2021-11-23 02:12:02,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:02,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576183323] [2021-11-23 02:12:02,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:02,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:02,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:02,543 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:12:02,543 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:02,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576183323] [2021-11-23 02:12:02,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576183323] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:02,543 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:02,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:12:02,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305139572] [2021-11-23 02:12:02,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:02,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:12:02,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:02,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:12:02,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:12:02,546 INFO L87 Difference]: Start difference. First operand 944 states and 1268 transitions. Second operand has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:12:03,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:03,150 INFO L93 Difference]: Finished difference Result 1624 states and 2085 transitions. [2021-11-23 02:12:03,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:12:03,151 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 63 [2021-11-23 02:12:03,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:03,163 INFO L225 Difference]: With dead ends: 1624 [2021-11-23 02:12:03,164 INFO L226 Difference]: Without dead ends: 1207 [2021-11-23 02:12:03,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:12:03,170 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 348 mSDsluCounter, 569 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 661 SdHoareTripleChecker+Invalid, 682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:03,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [371 Valid, 661 Invalid, 682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 576 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:12:03,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1207 states. [2021-11-23 02:12:03,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1207 to 1172. [2021-11-23 02:12:03,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1172 states, 849 states have (on average 1.3262661955241462) internal successors, (1126), 856 states have internal predecessors, (1126), 189 states have call successors, (189), 134 states have call predecessors, (189), 132 states have return successors, (216), 183 states have call predecessors, (216), 186 states have call successors, (216) [2021-11-23 02:12:03,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1172 states to 1172 states and 1531 transitions. [2021-11-23 02:12:03,276 INFO L78 Accepts]: Start accepts. Automaton has 1172 states and 1531 transitions. Word has length 63 [2021-11-23 02:12:03,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:03,278 INFO L470 AbstractCegarLoop]: Abstraction has 1172 states and 1531 transitions. [2021-11-23 02:12:03,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:12:03,278 INFO L276 IsEmpty]: Start isEmpty. Operand 1172 states and 1531 transitions. [2021-11-23 02:12:03,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:12:03,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:03,281 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] [2021-11-23 02:12:03,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:12:03,281 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:03,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:03,282 INFO L85 PathProgramCache]: Analyzing trace with hash 1131049379, now seen corresponding path program 1 times [2021-11-23 02:12:03,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:03,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2127485473] [2021-11-23 02:12:03,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:03,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:03,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:03,389 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:12:03,389 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:03,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2127485473] [2021-11-23 02:12:03,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2127485473] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:03,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324683060] [2021-11-23 02:12:03,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:03,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:03,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:03,391 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:03,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:12:03,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:03,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:12:03,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:03,804 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:12:03,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:04,019 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:12:04,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324683060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:04,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [233346689] [2021-11-23 02:12:04,022 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2021-11-23 02:12:04,022 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:12:04,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:12:04,023 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:12:04,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:12:10,241 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 125 for LOIs [2021-11-23 02:12:10,262 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 163 for LOIs [2021-11-23 02:12:10,301 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 164 for LOIs [2021-11-23 02:12:10,348 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 129 for LOIs [2021-11-23 02:12:10,666 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 125 for LOIs [2021-11-23 02:12:10,730 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 125 for LOIs [2021-11-23 02:12:10,776 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 125 for LOIs [2021-11-23 02:12:10,794 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 132 for LOIs [2021-11-23 02:12:10,810 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:12:25,714 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24278#(and (= ~q_req_up~0 1) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (<= 0 ~p_dw_pc~0) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~E_3~0 2) (<= ~t1_pc~0 0) (<= 2 ~M_E~0) (<= |#NULL.offset| 0) (= ~t4_i~0 0) (= ~m_i~0 0) (<= ~t2_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= ~E_4~0 2) (= ~E_2~0 2) (<= 0 ~t2_i~0) (= ~c_last_read~0 ~q_buf_0~0) (<= ~t3_st~0 0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (<= ~c_num_read~0 1) (= ~token~0 0) (<= 0 ~t3_st~0) (<= ~m_pc~0 0) (= ~c_dr_pc~0 0) (<= 2 ~E_4~0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (<= ~M_E~0 2) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= ~c_last_read~0 ~p_last_write~0) (<= 0 ~m_pc~0) (= ~E_M~0 2) (= ~a_t~0 0) (<= 0 ~t3_pc~0) (= 0 ~t2_st~0) (<= 1 ~c_num_read~0) (<= 0 ~m_st~0) (<= 0 |#NULL.offset|) (<= ~t4_pc~0 0) (= ~E_1~0 2) (<= 0 ~t4_pc~0) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (<= 0 ~t1_st~0) (<= 0 ~t1_pc~0) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:12:25,714 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:12:25,714 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:12:25,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2021-11-23 02:12:25,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256753390] [2021-11-23 02:12:25,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:12:25,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:12:25,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:25,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:12:25,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 02:12:25,717 INFO L87 Difference]: Start difference. First operand 1172 states and 1531 transitions. Second operand has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2021-11-23 02:12:26,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:26,304 INFO L93 Difference]: Finished difference Result 2717 states and 3398 transitions. [2021-11-23 02:12:26,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:12:26,304 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) Word has length 64 [2021-11-23 02:12:26,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:26,322 INFO L225 Difference]: With dead ends: 2717 [2021-11-23 02:12:26,322 INFO L226 Difference]: Without dead ends: 2714 [2021-11-23 02:12:26,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1043 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 02:12:26,325 INFO L933 BasicCegarLoop]: 329 mSDtfsCounter, 480 mSDsluCounter, 867 mSDsCounter, 0 mSdLazyCounter, 608 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 480 SdHoareTripleChecker+Valid, 1022 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:26,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [480 Valid, 1022 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 608 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:12:26,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2714 states. [2021-11-23 02:12:26,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2714 to 1912. [2021-11-23 02:12:26,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1912 states, 1367 states have (on average 1.3050475493782003) internal successors, (1784), 1374 states have internal predecessors, (1784), 307 states have call successors, (307), 238 states have call predecessors, (307), 236 states have return successors, (334), 301 states have call predecessors, (334), 304 states have call successors, (334) [2021-11-23 02:12:26,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1912 states to 1912 states and 2425 transitions. [2021-11-23 02:12:26,498 INFO L78 Accepts]: Start accepts. Automaton has 1912 states and 2425 transitions. Word has length 64 [2021-11-23 02:12:26,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:26,498 INFO L470 AbstractCegarLoop]: Abstraction has 1912 states and 2425 transitions. [2021-11-23 02:12:26,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2021-11-23 02:12:26,499 INFO L276 IsEmpty]: Start isEmpty. Operand 1912 states and 2425 transitions. [2021-11-23 02:12:26,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:12:26,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:26,501 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:12:26,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:26,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:12:26,725 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:26,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:26,726 INFO L85 PathProgramCache]: Analyzing trace with hash -875100124, now seen corresponding path program 2 times [2021-11-23 02:12:26,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:26,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922238937] [2021-11-23 02:12:26,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:26,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:26,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:26,766 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:12:26,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:26,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922238937] [2021-11-23 02:12:26,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922238937] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:26,767 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:26,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:26,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525988437] [2021-11-23 02:12:26,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:26,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:26,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:26,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:26,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:26,769 INFO L87 Difference]: Start difference. First operand 1912 states and 2425 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 02:12:26,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:26,957 INFO L93 Difference]: Finished difference Result 2680 states and 3357 transitions. [2021-11-23 02:12:26,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:26,957 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 67 [2021-11-23 02:12:26,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:26,967 INFO L225 Difference]: With dead ends: 2680 [2021-11-23 02:12:26,967 INFO L226 Difference]: Without dead ends: 1490 [2021-11-23 02:12:26,970 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 02:12:26,971 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 217 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:26,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 315 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:26,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1490 states. [2021-11-23 02:12:27,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1490 to 1480. [2021-11-23 02:12:27,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1480 states, 1063 states have (on average 1.303857008466604) internal successors, (1386), 1070 states have internal predecessors, (1386), 239 states have call successors, (239), 178 states have call predecessors, (239), 176 states have return successors, (266), 233 states have call predecessors, (266), 236 states have call successors, (266) [2021-11-23 02:12:27,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1480 states to 1480 states and 1891 transitions. [2021-11-23 02:12:27,107 INFO L78 Accepts]: Start accepts. Automaton has 1480 states and 1891 transitions. Word has length 67 [2021-11-23 02:12:27,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:27,107 INFO L470 AbstractCegarLoop]: Abstraction has 1480 states and 1891 transitions. [2021-11-23 02:12:27,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 02:12:27,108 INFO L276 IsEmpty]: Start isEmpty. Operand 1480 states and 1891 transitions. [2021-11-23 02:12:27,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:12:27,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:27,110 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 02:12:27,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:12:27,111 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:27,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:27,111 INFO L85 PathProgramCache]: Analyzing trace with hash -20305958, now seen corresponding path program 1 times [2021-11-23 02:12:27,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:27,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191501322] [2021-11-23 02:12:27,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:27,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:27,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:27,142 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:12:27,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:27,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191501322] [2021-11-23 02:12:27,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191501322] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:27,143 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:27,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:27,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233291569] [2021-11-23 02:12:27,143 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:27,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:27,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:27,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:27,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:27,144 INFO L87 Difference]: Start difference. First operand 1480 states and 1891 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 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 02:12:27,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:27,328 INFO L93 Difference]: Finished difference Result 2511 states and 3124 transitions. [2021-11-23 02:12:27,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:27,328 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 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 02:12:27,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:27,338 INFO L225 Difference]: With dead ends: 2511 [2021-11-23 02:12:27,338 INFO L226 Difference]: Without dead ends: 1654 [2021-11-23 02:12:27,341 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 02:12:27,342 INFO L933 BasicCegarLoop]: 233 mSDtfsCounter, 39 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 430 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:27,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 430 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:27,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1654 states. [2021-11-23 02:12:27,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1654 to 1525. [2021-11-23 02:12:27,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1525 states, 1100 states have (on average 1.3) internal successors, (1430), 1107 states have internal predecessors, (1430), 243 states have call successors, (243), 182 states have call predecessors, (243), 180 states have return successors, (270), 237 states have call predecessors, (270), 240 states have call successors, (270) [2021-11-23 02:12:27,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1525 states to 1525 states and 1943 transitions. [2021-11-23 02:12:27,476 INFO L78 Accepts]: Start accepts. Automaton has 1525 states and 1943 transitions. Word has length 71 [2021-11-23 02:12:27,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:27,476 INFO L470 AbstractCegarLoop]: Abstraction has 1525 states and 1943 transitions. [2021-11-23 02:12:27,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 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 02:12:27,477 INFO L276 IsEmpty]: Start isEmpty. Operand 1525 states and 1943 transitions. [2021-11-23 02:12:27,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 02:12:27,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:27,480 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:12:27,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:12:27,480 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:27,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:27,481 INFO L85 PathProgramCache]: Analyzing trace with hash -729284993, now seen corresponding path program 1 times [2021-11-23 02:12:27,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:27,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56684342] [2021-11-23 02:12:27,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:27,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:27,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:27,542 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:12:27,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:27,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56684342] [2021-11-23 02:12:27,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56684342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:27,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355746660] [2021-11-23 02:12:27,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:27,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:27,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:27,545 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:27,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:12:27,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:27,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:12:27,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:27,794 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:12:27,795 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:27,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355746660] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:27,795 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:27,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:12:27,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601900970] [2021-11-23 02:12:27,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:27,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:27,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:27,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:27,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:27,800 INFO L87 Difference]: Start difference. First operand 1525 states and 1943 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:12:27,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:27,990 INFO L93 Difference]: Finished difference Result 2379 states and 3279 transitions. [2021-11-23 02:12:27,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:27,991 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2021-11-23 02:12:27,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:28,003 INFO L225 Difference]: With dead ends: 2379 [2021-11-23 02:12:28,003 INFO L226 Difference]: Without dead ends: 1944 [2021-11-23 02:12:28,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:28,008 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 208 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:28,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 323 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:28,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1944 states. [2021-11-23 02:12:28,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1944 to 1935. [2021-11-23 02:12:28,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1935 states, 1418 states have (on average 1.3293370944992948) internal successors, (1885), 1428 states have internal predecessors, (1885), 305 states have call successors, (305), 212 states have call predecessors, (305), 210 states have return successors, (358), 296 states have call predecessors, (358), 302 states have call successors, (358) [2021-11-23 02:12:28,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1935 states to 1935 states and 2548 transitions. [2021-11-23 02:12:28,195 INFO L78 Accepts]: Start accepts. Automaton has 1935 states and 2548 transitions. Word has length 81 [2021-11-23 02:12:28,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:28,196 INFO L470 AbstractCegarLoop]: Abstraction has 1935 states and 2548 transitions. [2021-11-23 02:12:28,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:12:28,196 INFO L276 IsEmpty]: Start isEmpty. Operand 1935 states and 2548 transitions. [2021-11-23 02:12:28,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 02:12:28,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:28,199 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:12:28,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:28,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:28,425 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:28,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:28,426 INFO L85 PathProgramCache]: Analyzing trace with hash 366430879, now seen corresponding path program 1 times [2021-11-23 02:12:28,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:28,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9681978] [2021-11-23 02:12:28,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:28,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:28,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:28,479 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:12:28,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:28,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9681978] [2021-11-23 02:12:28,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9681978] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:28,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94742297] [2021-11-23 02:12:28,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:28,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:28,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:28,481 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:28,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:12:28,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:28,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:12:28,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:28,734 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:12:28,734 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:28,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94742297] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:28,734 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:28,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:12:28,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645359350] [2021-11-23 02:12:28,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:28,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:28,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:28,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:28,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:28,736 INFO L87 Difference]: Start difference. First operand 1935 states and 2548 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:12:28,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:28,979 INFO L93 Difference]: Finished difference Result 3594 states and 5114 transitions. [2021-11-23 02:12:28,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:28,980 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2021-11-23 02:12:28,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:28,998 INFO L225 Difference]: With dead ends: 3594 [2021-11-23 02:12:28,998 INFO L226 Difference]: Without dead ends: 2749 [2021-11-23 02:12:29,004 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:29,005 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 211 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:29,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 323 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:29,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2749 states. [2021-11-23 02:12:29,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2749 to 2735. [2021-11-23 02:12:29,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2735 states, 2039 states have (on average 1.356056890632663) internal successors, (2765), 2055 states have internal predecessors, (2765), 424 states have call successors, (424), 272 states have call predecessors, (424), 270 states have return successors, (525), 409 states have call predecessors, (525), 421 states have call successors, (525) [2021-11-23 02:12:29,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2735 states to 2735 states and 3714 transitions. [2021-11-23 02:12:29,232 INFO L78 Accepts]: Start accepts. Automaton has 2735 states and 3714 transitions. Word has length 81 [2021-11-23 02:12:29,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:29,232 INFO L470 AbstractCegarLoop]: Abstraction has 2735 states and 3714 transitions. [2021-11-23 02:12:29,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:12:29,233 INFO L276 IsEmpty]: Start isEmpty. Operand 2735 states and 3714 transitions. [2021-11-23 02:12:29,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 02:12:29,237 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:29,238 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:12:29,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:29,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:12:29,465 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:29,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:29,466 INFO L85 PathProgramCache]: Analyzing trace with hash 1086524031, now seen corresponding path program 1 times [2021-11-23 02:12:29,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:29,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74955062] [2021-11-23 02:12:29,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:29,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:29,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:29,520 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:12:29,521 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:29,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74955062] [2021-11-23 02:12:29,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74955062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:29,521 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:29,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:29,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109269560] [2021-11-23 02:12:29,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:29,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:29,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:29,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:29,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:29,524 INFO L87 Difference]: Start difference. First operand 2735 states and 3714 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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 02:12:29,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:29,807 INFO L93 Difference]: Finished difference Result 4435 states and 6329 transitions. [2021-11-23 02:12:29,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:29,807 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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 81 [2021-11-23 02:12:29,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:29,831 INFO L225 Difference]: With dead ends: 4435 [2021-11-23 02:12:29,831 INFO L226 Difference]: Without dead ends: 3111 [2021-11-23 02:12:29,839 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 02:12:29,841 INFO L933 BasicCegarLoop]: 257 mSDtfsCounter, 56 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:29,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 459 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:29,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3111 states. [2021-11-23 02:12:30,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3111 to 2939. [2021-11-23 02:12:30,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2939 states, 2227 states have (on average 1.3834755276156263) internal successors, (3081), 2243 states have internal predecessors, (3081), 432 states have call successors, (432), 280 states have call predecessors, (432), 278 states have return successors, (533), 417 states have call predecessors, (533), 429 states have call successors, (533) [2021-11-23 02:12:30,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2939 states to 2939 states and 4046 transitions. [2021-11-23 02:12:30,101 INFO L78 Accepts]: Start accepts. Automaton has 2939 states and 4046 transitions. Word has length 81 [2021-11-23 02:12:30,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:30,101 INFO L470 AbstractCegarLoop]: Abstraction has 2939 states and 4046 transitions. [2021-11-23 02:12:30,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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 02:12:30,103 INFO L276 IsEmpty]: Start isEmpty. Operand 2939 states and 4046 transitions. [2021-11-23 02:12:30,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 02:12:30,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:30,110 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:12:30,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:12:30,111 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:30,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:30,111 INFO L85 PathProgramCache]: Analyzing trace with hash -549750117, now seen corresponding path program 1 times [2021-11-23 02:12:30,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:30,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399336874] [2021-11-23 02:12:30,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:30,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:30,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:30,291 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:12:30,292 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:30,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399336874] [2021-11-23 02:12:30,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399336874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:30,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70221124] [2021-11-23 02:12:30,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:30,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:30,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:30,297 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:30,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:12:30,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:30,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:12:30,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:30,550 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:12:30,551 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:30,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70221124] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:30,551 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:30,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [14] total 15 [2021-11-23 02:12:30,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254528445] [2021-11-23 02:12:30,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:30,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:30,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:30,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:30,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:12:30,553 INFO L87 Difference]: Start difference. First operand 2939 states and 4046 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:12:30,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:30,823 INFO L93 Difference]: Finished difference Result 3768 states and 5064 transitions. [2021-11-23 02:12:30,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:30,824 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 102 [2021-11-23 02:12:30,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:30,844 INFO L225 Difference]: With dead ends: 3768 [2021-11-23 02:12:30,844 INFO L226 Difference]: Without dead ends: 2968 [2021-11-23 02:12:30,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:12:30,849 INFO L933 BasicCegarLoop]: 251 mSDtfsCounter, 47 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:30,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 442 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:30,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2968 states. [2021-11-23 02:12:31,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2968 to 2935. [2021-11-23 02:12:31,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2935 states, 2223 states have (on average 1.369770580296896) internal successors, (3045), 2239 states have internal predecessors, (3045), 432 states have call successors, (432), 280 states have call predecessors, (432), 278 states have return successors, (533), 417 states have call predecessors, (533), 429 states have call successors, (533) [2021-11-23 02:12:31,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2935 states to 2935 states and 4010 transitions. [2021-11-23 02:12:31,123 INFO L78 Accepts]: Start accepts. Automaton has 2935 states and 4010 transitions. Word has length 102 [2021-11-23 02:12:31,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:31,124 INFO L470 AbstractCegarLoop]: Abstraction has 2935 states and 4010 transitions. [2021-11-23 02:12:31,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:12:31,124 INFO L276 IsEmpty]: Start isEmpty. Operand 2935 states and 4010 transitions. [2021-11-23 02:12:31,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 02:12:31,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:31,132 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:31,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:31,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:12:31,357 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:31,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:31,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1026807642, now seen corresponding path program 1 times [2021-11-23 02:12:31,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:31,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730509298] [2021-11-23 02:12:31,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:31,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:31,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:31,547 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:12:31,547 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:31,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730509298] [2021-11-23 02:12:31,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730509298] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:31,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137059962] [2021-11-23 02:12:31,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:31,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:31,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:31,549 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:31,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:12:31,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:31,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:12:31,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:31,853 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:12:31,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:31,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137059962] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:31,853 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:31,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2021-11-23 02:12:31,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759228786] [2021-11-23 02:12:31,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:31,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:12:31,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:31,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:12:31,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:12:31,856 INFO L87 Difference]: Start difference. First operand 2935 states and 4010 transitions. Second operand has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:12:32,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:32,245 INFO L93 Difference]: Finished difference Result 3819 states and 5080 transitions. [2021-11-23 02:12:32,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:12:32,246 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 102 [2021-11-23 02:12:32,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:32,277 INFO L225 Difference]: With dead ends: 3819 [2021-11-23 02:12:32,277 INFO L226 Difference]: Without dead ends: 2766 [2021-11-23 02:12:32,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:12:32,282 INFO L933 BasicCegarLoop]: 246 mSDtfsCounter, 208 mSDsluCounter, 866 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 989 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:32,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 989 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:12:32,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2766 states. [2021-11-23 02:12:32,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2766 to 2569. [2021-11-23 02:12:32,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2569 states, 1989 states have (on average 1.3926596279537455) internal successors, (2770), 2005 states have internal predecessors, (2770), 361 states have call successors, (361), 219 states have call predecessors, (361), 217 states have return successors, (462), 346 states have call predecessors, (462), 358 states have call successors, (462) [2021-11-23 02:12:32,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2569 states to 2569 states and 3593 transitions. [2021-11-23 02:12:32,481 INFO L78 Accepts]: Start accepts. Automaton has 2569 states and 3593 transitions. Word has length 102 [2021-11-23 02:12:32,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:32,482 INFO L470 AbstractCegarLoop]: Abstraction has 2569 states and 3593 transitions. [2021-11-23 02:12:32,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:12:32,482 INFO L276 IsEmpty]: Start isEmpty. Operand 2569 states and 3593 transitions. [2021-11-23 02:12:32,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 02:12:32,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:32,491 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:12:32,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:32,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:12:32,717 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:32,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:32,718 INFO L85 PathProgramCache]: Analyzing trace with hash -1000272319, now seen corresponding path program 1 times [2021-11-23 02:12:32,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:32,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511486124] [2021-11-23 02:12:32,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:32,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:32,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:32,801 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:12:32,801 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:32,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511486124] [2021-11-23 02:12:32,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511486124] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:32,802 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:32,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:12:32,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261862888] [2021-11-23 02:12:32,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:32,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:12:32,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:32,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:12:32,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:12:32,805 INFO L87 Difference]: Start difference. First operand 2569 states and 3593 transitions. Second operand has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 02:12:33,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:33,126 INFO L93 Difference]: Finished difference Result 3188 states and 4335 transitions. [2021-11-23 02:12:33,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:12:33,127 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 112 [2021-11-23 02:12:33,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:33,150 INFO L225 Difference]: With dead ends: 3188 [2021-11-23 02:12:33,150 INFO L226 Difference]: Without dead ends: 2568 [2021-11-23 02:12:33,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:12:33,154 INFO L933 BasicCegarLoop]: 238 mSDtfsCounter, 269 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:33,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 395 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:12:33,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2568 states. [2021-11-23 02:12:33,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2568 to 2559. [2021-11-23 02:12:33,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2559 states, 1979 states have (on average 1.3815058110156644) internal successors, (2734), 1995 states have internal predecessors, (2734), 361 states have call successors, (361), 219 states have call predecessors, (361), 217 states have return successors, (462), 346 states have call predecessors, (462), 358 states have call successors, (462) [2021-11-23 02:12:33,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2559 states to 2559 states and 3557 transitions. [2021-11-23 02:12:33,356 INFO L78 Accepts]: Start accepts. Automaton has 2559 states and 3557 transitions. Word has length 112 [2021-11-23 02:12:33,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:33,357 INFO L470 AbstractCegarLoop]: Abstraction has 2559 states and 3557 transitions. [2021-11-23 02:12:33,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 02:12:33,357 INFO L276 IsEmpty]: Start isEmpty. Operand 2559 states and 3557 transitions. [2021-11-23 02:12:33,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 02:12:33,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:33,366 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:12:33,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:12:33,366 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:33,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:33,367 INFO L85 PathProgramCache]: Analyzing trace with hash 893169856, now seen corresponding path program 1 times [2021-11-23 02:12:33,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:33,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858715375] [2021-11-23 02:12:33,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:33,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:33,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:33,448 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 8 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:12:33,449 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:33,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858715375] [2021-11-23 02:12:33,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858715375] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:33,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577899522] [2021-11-23 02:12:33,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:33,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:33,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:33,451 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:33,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:12:33,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:33,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:12:33,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:33,789 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:12:33,790 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:33,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577899522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:33,790 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:33,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2021-11-23 02:12:33,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070651690] [2021-11-23 02:12:33,790 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:33,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:12:33,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:33,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:12:33,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:12:33,792 INFO L87 Difference]: Start difference. First operand 2559 states and 3557 transitions. Second operand has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:12:34,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:34,157 INFO L93 Difference]: Finished difference Result 3108 states and 4182 transitions. [2021-11-23 02:12:34,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:12:34,158 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 112 [2021-11-23 02:12:34,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:34,168 INFO L225 Difference]: With dead ends: 3108 [2021-11-23 02:12:34,168 INFO L226 Difference]: Without dead ends: 2515 [2021-11-23 02:12:34,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:12:34,171 INFO L933 BasicCegarLoop]: 243 mSDtfsCounter, 66 mSDsluCounter, 1289 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 1339 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:34,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 1339 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 347 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:12:34,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2515 states. [2021-11-23 02:12:34,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2515 to 2423. [2021-11-23 02:12:34,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2423 states, 1879 states have (on average 1.3927621075039915) internal successors, (2617), 1895 states have internal predecessors, (2617), 342 states have call successors, (342), 202 states have call predecessors, (342), 200 states have return successors, (443), 327 states have call predecessors, (443), 339 states have call successors, (443) [2021-11-23 02:12:34,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2423 states to 2423 states and 3402 transitions. [2021-11-23 02:12:34,380 INFO L78 Accepts]: Start accepts. Automaton has 2423 states and 3402 transitions. Word has length 112 [2021-11-23 02:12:34,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:34,381 INFO L470 AbstractCegarLoop]: Abstraction has 2423 states and 3402 transitions. [2021-11-23 02:12:34,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:12:34,381 INFO L276 IsEmpty]: Start isEmpty. Operand 2423 states and 3402 transitions. [2021-11-23 02:12:34,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:12:34,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:34,390 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:34,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:34,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:34,605 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:34,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:34,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1972336602, now seen corresponding path program 1 times [2021-11-23 02:12:34,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:34,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662219934] [2021-11-23 02:12:34,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:34,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:34,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:34,678 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:12:34,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:34,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662219934] [2021-11-23 02:12:34,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662219934] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:34,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213067089] [2021-11-23 02:12:34,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:34,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:34,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:34,681 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:34,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:12:34,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:34,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:12:34,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:34,954 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:12:34,954 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:34,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213067089] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:34,954 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:34,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-23 02:12:34,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409370775] [2021-11-23 02:12:34,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:34,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:12:34,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:34,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:12:34,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:12:34,956 INFO L87 Difference]: Start difference. First operand 2423 states and 3402 transitions. Second operand has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-23 02:12:35,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:35,229 INFO L93 Difference]: Finished difference Result 3172 states and 4247 transitions. [2021-11-23 02:12:35,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:12:35,229 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) Word has length 113 [2021-11-23 02:12:35,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:35,240 INFO L225 Difference]: With dead ends: 3172 [2021-11-23 02:12:35,240 INFO L226 Difference]: Without dead ends: 2715 [2021-11-23 02:12:35,243 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:12:35,243 INFO L933 BasicCegarLoop]: 235 mSDtfsCounter, 193 mSDsluCounter, 900 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 1000 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:35,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 1000 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:35,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2715 states. [2021-11-23 02:12:35,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2715 to 2681. [2021-11-23 02:12:35,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2681 states, 2041 states have (on average 1.370406663400294) internal successors, (2797), 2063 states have internal predecessors, (2797), 390 states have call successors, (390), 244 states have call predecessors, (390), 248 states have return successors, (503), 375 states have call predecessors, (503), 387 states have call successors, (503) [2021-11-23 02:12:35,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2681 states to 2681 states and 3690 transitions. [2021-11-23 02:12:35,449 INFO L78 Accepts]: Start accepts. Automaton has 2681 states and 3690 transitions. Word has length 113 [2021-11-23 02:12:35,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:35,452 INFO L470 AbstractCegarLoop]: Abstraction has 2681 states and 3690 transitions. [2021-11-23 02:12:35,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-23 02:12:35,452 INFO L276 IsEmpty]: Start isEmpty. Operand 2681 states and 3690 transitions. [2021-11-23 02:12:35,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 02:12:35,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:35,461 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:12:35,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:35,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:35,677 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:35,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:35,678 INFO L85 PathProgramCache]: Analyzing trace with hash 1479902674, now seen corresponding path program 1 times [2021-11-23 02:12:35,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:35,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380661898] [2021-11-23 02:12:35,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:35,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:35,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:35,767 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:12:35,768 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:35,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380661898] [2021-11-23 02:12:35,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380661898] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:35,768 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:35,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:35,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041248485] [2021-11-23 02:12:35,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:35,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:35,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:35,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:35,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:35,770 INFO L87 Difference]: Start difference. First operand 2681 states and 3690 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:12:36,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:36,156 INFO L93 Difference]: Finished difference Result 6290 states and 9227 transitions. [2021-11-23 02:12:36,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:36,157 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), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 107 [2021-11-23 02:12:36,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:36,175 INFO L225 Difference]: With dead ends: 6290 [2021-11-23 02:12:36,175 INFO L226 Difference]: Without dead ends: 4441 [2021-11-23 02:12:36,186 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 02:12:36,186 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 205 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:36,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 323 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:36,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4441 states. [2021-11-23 02:12:36,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4441 to 4409. [2021-11-23 02:12:36,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4409 states, 3405 states have (on average 1.3923641703377385) internal successors, (4741), 3439 states have internal predecessors, (4741), 626 states have call successors, (626), 372 states have call predecessors, (626), 376 states have return successors, (827), 599 states have call predecessors, (827), 623 states have call successors, (827) [2021-11-23 02:12:36,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4409 states to 4409 states and 6194 transitions. [2021-11-23 02:12:36,502 INFO L78 Accepts]: Start accepts. Automaton has 4409 states and 6194 transitions. Word has length 107 [2021-11-23 02:12:36,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:36,502 INFO L470 AbstractCegarLoop]: Abstraction has 4409 states and 6194 transitions. [2021-11-23 02:12:36,502 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), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:12:36,503 INFO L276 IsEmpty]: Start isEmpty. Operand 4409 states and 6194 transitions. [2021-11-23 02:12:36,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 02:12:36,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:36,518 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:12:36,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:12:36,518 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:36,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:36,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1731962658, now seen corresponding path program 1 times [2021-11-23 02:12:36,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:36,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531512483] [2021-11-23 02:12:36,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:36,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:36,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:36,890 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:12:36,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:36,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531512483] [2021-11-23 02:12:36,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531512483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:36,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838865244] [2021-11-23 02:12:36,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:36,890 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:36,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:36,893 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:36,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:12:37,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:37,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 02:12:37,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:38,265 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 31 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:12:38,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:40,407 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:12:40,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838865244] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:40,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1535085096] [2021-11-23 02:12:40,411 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2021-11-23 02:12:40,413 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:12:40,414 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:12:40,415 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:12:40,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:13:15,137 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 212 for LOIs [2021-11-23 02:13:15,578 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 164 for LOIs [2021-11-23 02:13:15,619 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 78 for LOIs [2021-11-23 02:13:15,629 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 224 for LOIs [2021-11-23 02:13:16,741 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 132 for LOIs [2021-11-23 02:13:16,903 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 78 for LOIs [2021-11-23 02:13:17,034 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 216 for LOIs [2021-11-23 02:13:17,330 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 239 for LOIs [2021-11-23 02:13:17,625 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:13:49,925 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '130753#(and (<= 0 ~c_dr_pc~0) (<= 0 ~p_dw_st~0) (<= 0 ~p_dw_pc~0) (<= 0 ~p_num_write~0) (<= ~c_dr_pc~0 1) (<= ~p_dw_st~0 2) (not (= ~c_num_read~0 ~p_num_write~0)) (or (and (= ~q_req_up~0 1) (= ~E_4~0 2) (= ~t1_pc~0 0) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~q_free~0 1) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~E_3~0 2) (= ~t2_i~0 0) (= ~t4_i~0 0) (= ~c_num_read~0 1) (= ~m_i~0 0) (= ~E_2~0 2) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~E_M~0 2) (= 0 ~t2_st~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (= ~c_dr_st~0 1) (= ~t1_i~0 0) (= |#NULL.base| 0)) (and (= ~q_req_up~0 1) (= ~E_4~0 2) (= ~t1_pc~0 0) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~q_free~0 1) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~E_3~0 2) (= ~t2_i~0 0) (= ~t4_i~0 0) (= ~c_dr_pc~0 1) (= ~m_i~0 0) (= ~E_2~0 2) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~E_M~0 2) (= 0 ~t2_st~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (= ~c_dr_st~0 1) (= ~t1_i~0 0) (= |#NULL.base| 0))) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= ~c_last_read~0 ~p_last_write~0) (<= 0 ~t3_pc~0) (<= 1 ~c_num_read~0) (<= 0 ~m_st~0) (<= ~t4_pc~0 0) (<= 0 ~t4_pc~0) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 ~t1_st~0))' at error location [2021-11-23 02:13:49,925 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:13:49,926 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:13:49,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 16] total 51 [2021-11-23 02:13:49,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440241279] [2021-11-23 02:13:49,926 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:13:49,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 02:13:49,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:13:49,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 02:13:49,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=795, Invalid=10335, Unknown=0, NotChecked=0, Total=11130 [2021-11-23 02:13:49,932 INFO L87 Difference]: Start difference. First operand 4409 states and 6194 transitions. Second operand has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) [2021-11-23 02:14:11,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:11,058 INFO L93 Difference]: Finished difference Result 7278 states and 9683 transitions. [2021-11-23 02:14:11,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 255 states. [2021-11-23 02:14:11,060 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) Word has length 114 [2021-11-23 02:14:11,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:11,082 INFO L225 Difference]: With dead ends: 7278 [2021-11-23 02:14:11,083 INFO L226 Difference]: Without dead ends: 6563 [2021-11-23 02:14:11,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 290 SyntacticMatches, 4 SemanticMatches, 354 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51837 ImplicationChecksByTransitivity, 48.5s TimeCoverageRelationStatistics Valid=11551, Invalid=114829, Unknown=0, NotChecked=0, Total=126380 [2021-11-23 02:14:11,113 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 4870 mSDsluCounter, 3568 mSDsCounter, 0 mSdLazyCounter, 8395 mSolverCounterSat, 3242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4870 SdHoareTripleChecker+Valid, 3404 SdHoareTripleChecker+Invalid, 11637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3242 IncrementalHoareTripleChecker+Valid, 8395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:11,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4870 Valid, 3404 Invalid, 11637 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3242 Valid, 8395 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2021-11-23 02:14:11,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6563 states. [2021-11-23 02:14:11,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6563 to 4685. [2021-11-23 02:14:11,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4685 states, 3589 states have (on average 1.379771524101421) internal successors, (4952), 3625 states have internal predecessors, (4952), 671 states have call successors, (671), 409 states have call predecessors, (671), 423 states have return successors, (884), 652 states have call predecessors, (884), 668 states have call successors, (884) [2021-11-23 02:14:11,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4685 states to 4685 states and 6507 transitions. [2021-11-23 02:14:11,650 INFO L78 Accepts]: Start accepts. Automaton has 4685 states and 6507 transitions. Word has length 114 [2021-11-23 02:14:11,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:11,650 INFO L470 AbstractCegarLoop]: Abstraction has 4685 states and 6507 transitions. [2021-11-23 02:14:11,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) [2021-11-23 02:14:11,651 INFO L276 IsEmpty]: Start isEmpty. Operand 4685 states and 6507 transitions. [2021-11-23 02:14:11,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 02:14:11,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:11,667 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:11,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:11,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-23 02:14:11,887 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:11,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:11,888 INFO L85 PathProgramCache]: Analyzing trace with hash -1117241275, now seen corresponding path program 1 times [2021-11-23 02:14:11,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:11,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447547509] [2021-11-23 02:14:11,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:11,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:11,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:12,033 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 23 proven. 11 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:14:12,033 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:12,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447547509] [2021-11-23 02:14:12,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447547509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:12,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108417111] [2021-11-23 02:14:12,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:12,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:12,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:12,035 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:12,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:14:12,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:12,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:14:12,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:12,349 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:14:12,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:12,641 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:14:12,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108417111] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:12,641 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:14:12,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 20 [2021-11-23 02:14:12,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363401545] [2021-11-23 02:14:12,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:12,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:14:12,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:12,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:14:12,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:14:12,643 INFO L87 Difference]: Start difference. First operand 4685 states and 6507 transitions. Second operand has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:14:13,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:13,389 INFO L93 Difference]: Finished difference Result 6009 states and 8055 transitions. [2021-11-23 02:14:13,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:14:13,390 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 115 [2021-11-23 02:14:13,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:13,411 INFO L225 Difference]: With dead ends: 6009 [2021-11-23 02:14:13,411 INFO L226 Difference]: Without dead ends: 5018 [2021-11-23 02:14:13,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:14:13,417 INFO L933 BasicCegarLoop]: 236 mSDtfsCounter, 311 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 653 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:13,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [315 Valid, 606 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 653 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:14:13,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5018 states. [2021-11-23 02:14:13,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5018 to 4765. [2021-11-23 02:14:13,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4765 states, 3634 states have (on average 1.3767198679141441) internal successors, (5003), 3673 states have internal predecessors, (5003), 690 states have call successors, (690), 418 states have call predecessors, (690), 439 states have return successors, (924), 675 states have call predecessors, (924), 687 states have call successors, (924) [2021-11-23 02:14:13,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4765 states to 4765 states and 6617 transitions. [2021-11-23 02:14:13,872 INFO L78 Accepts]: Start accepts. Automaton has 4765 states and 6617 transitions. Word has length 115 [2021-11-23 02:14:13,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:13,873 INFO L470 AbstractCegarLoop]: Abstraction has 4765 states and 6617 transitions. [2021-11-23 02:14:13,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:14:13,873 INFO L276 IsEmpty]: Start isEmpty. Operand 4765 states and 6617 transitions. [2021-11-23 02:14:13,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:14:13,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:13,891 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:13,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:14,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:14,105 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:14,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:14,106 INFO L85 PathProgramCache]: Analyzing trace with hash -1467232233, now seen corresponding path program 1 times [2021-11-23 02:14:14,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:14,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069950143] [2021-11-23 02:14:14,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:14,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:14,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:14,503 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 27 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:14:14,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:14,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069950143] [2021-11-23 02:14:14,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2069950143] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:14,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42725903] [2021-11-23 02:14:14,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:14,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:14,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:14,505 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:14,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:14:14,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:14,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-23 02:14:14,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:15,633 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 60 proven. 23 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:14:15,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:17,375 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:14:17,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42725903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:14:17,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1765736236] [2021-11-23 02:14:17,378 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2021-11-23 02:14:17,379 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:14:17,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:14:17,380 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:14:17,380 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:14:24,933 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 212 for LOIs [2021-11-23 02:14:25,325 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 161 for LOIs [2021-11-23 02:14:25,364 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 80 for LOIs [2021-11-23 02:14:25,375 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 224 for LOIs [2021-11-23 02:14:26,567 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 132 for LOIs [2021-11-23 02:14:26,735 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 80 for LOIs [2021-11-23 02:14:26,872 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 216 for LOIs [2021-11-23 02:14:27,214 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 239 for LOIs [2021-11-23 02:14:27,488 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:14:59,236 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '165639#(and (= ~q_req_up~0 1) (= ~E_4~0 2) (= ~t1_pc~0 0) (= ~T4_E~0 2) (<= 0 ~p_dw_st~0) (= 0 ~t4_st~0) (= ~T1_E~0 2) (<= 0 ~p_dw_pc~0) (= ~m_st~0 0) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (<= ~p_dw_st~0 2) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= ~t2_i~0 0) (= ~t4_i~0 0) (= ~c_dr_pc~0 1) (= ~c_num_read~0 1) (= ~m_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~E_2~0 2) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (= ~E_M~0 2) (= 0 ~t2_st~0) (<= ~t4_pc~0 0) (= ~E_1~0 2) (= 0 ~t3_st~0) (<= 0 ~t4_pc~0) (= ~M_E~0 2) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (<= 0 ~t1_st~0) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:14:59,236 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:14:59,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:14:59,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 18] total 55 [2021-11-23 02:14:59,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865542467] [2021-11-23 02:14:59,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:14:59,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 02:14:59,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:59,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 02:14:59,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=959, Invalid=11697, Unknown=0, NotChecked=0, Total=12656 [2021-11-23 02:14:59,241 INFO L87 Difference]: Start difference. First operand 4765 states and 6617 transitions. Second operand has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) [2021-11-23 02:15:12,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:12,847 INFO L93 Difference]: Finished difference Result 7049 states and 9319 transitions. [2021-11-23 02:15:12,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2021-11-23 02:15:12,848 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) Word has length 124 [2021-11-23 02:15:12,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:12,870 INFO L225 Difference]: With dead ends: 7049 [2021-11-23 02:15:12,870 INFO L226 Difference]: Without dead ends: 5978 [2021-11-23 02:15:12,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 321 SyntacticMatches, 1 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26860 ImplicationChecksByTransitivity, 40.5s TimeCoverageRelationStatistics Valid=6757, Invalid=62675, Unknown=0, NotChecked=0, Total=69432 [2021-11-23 02:15:12,881 INFO L933 BasicCegarLoop]: 258 mSDtfsCounter, 5226 mSDsluCounter, 2983 mSDsCounter, 0 mSdLazyCounter, 8392 mSolverCounterSat, 3783 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5226 SdHoareTripleChecker+Valid, 2787 SdHoareTripleChecker+Invalid, 12175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3783 IncrementalHoareTripleChecker+Valid, 8392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:12,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5226 Valid, 2787 Invalid, 12175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3783 Valid, 8392 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2021-11-23 02:15:12,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5978 states. [2021-11-23 02:15:13,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5978 to 4581. [2021-11-23 02:15:13,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4581 states, 3522 states have (on average 1.3841567291311754) internal successors, (4875), 3560 states have internal predecessors, (4875), 650 states have call successors, (650), 386 states have call predecessors, (650), 407 states have return successors, (874), 636 states have call predecessors, (874), 647 states have call successors, (874) [2021-11-23 02:15:13,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4581 states to 4581 states and 6399 transitions. [2021-11-23 02:15:13,337 INFO L78 Accepts]: Start accepts. Automaton has 4581 states and 6399 transitions. Word has length 124 [2021-11-23 02:15:13,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:13,338 INFO L470 AbstractCegarLoop]: Abstraction has 4581 states and 6399 transitions. [2021-11-23 02:15:13,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) [2021-11-23 02:15:13,338 INFO L276 IsEmpty]: Start isEmpty. Operand 4581 states and 6399 transitions. [2021-11-23 02:15:13,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 02:15:13,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:13,357 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:13,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:13,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 02:15:13,585 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:13,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:13,586 INFO L85 PathProgramCache]: Analyzing trace with hash 1169428116, now seen corresponding path program 1 times [2021-11-23 02:15:13,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:13,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682686842] [2021-11-23 02:15:13,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:13,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:13,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:13,714 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 38 proven. 9 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:15:13,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:13,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682686842] [2021-11-23 02:15:13,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682686842] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:13,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835725540] [2021-11-23 02:15:13,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:13,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:13,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:13,717 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:13,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:15:13,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:13,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:15:13,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:14,046 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 50 proven. 17 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:15:14,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:14,420 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:15:14,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835725540] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:14,420 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:15:14,420 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 10] total 17 [2021-11-23 02:15:14,420 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485932930] [2021-11-23 02:15:14,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:14,421 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:15:14,421 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:14,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:15:14,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:15:14,422 INFO L87 Difference]: Start difference. First operand 4581 states and 6399 transitions. Second operand has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:15:15,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:15,273 INFO L93 Difference]: Finished difference Result 5236 states and 7140 transitions. [2021-11-23 02:15:15,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:15:15,273 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 125 [2021-11-23 02:15:15,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:15,290 INFO L225 Difference]: With dead ends: 5236 [2021-11-23 02:15:15,291 INFO L226 Difference]: Without dead ends: 4349 [2021-11-23 02:15:15,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:15:15,296 INFO L933 BasicCegarLoop]: 225 mSDtfsCounter, 496 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 498 SdHoareTripleChecker+Valid, 480 SdHoareTripleChecker+Invalid, 777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:15,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [498 Valid, 480 Invalid, 777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:15:15,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4349 states. [2021-11-23 02:15:15,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4349 to 4312. [2021-11-23 02:15:15,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4312 states, 3323 states have (on average 1.393319289798375) internal successors, (4630), 3361 states have internal predecessors, (4630), 614 states have call successors, (614), 356 states have call predecessors, (614), 373 states have return successors, (833), 596 states have call predecessors, (833), 611 states have call successors, (833) [2021-11-23 02:15:15,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4312 states to 4312 states and 6077 transitions. [2021-11-23 02:15:15,855 INFO L78 Accepts]: Start accepts. Automaton has 4312 states and 6077 transitions. Word has length 125 [2021-11-23 02:15:15,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:15,856 INFO L470 AbstractCegarLoop]: Abstraction has 4312 states and 6077 transitions. [2021-11-23 02:15:15,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:15:15,856 INFO L276 IsEmpty]: Start isEmpty. Operand 4312 states and 6077 transitions. [2021-11-23 02:15:15,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:15:15,870 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:15,871 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:15:15,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:16,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 02:15:16,085 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:16,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:16,086 INFO L85 PathProgramCache]: Analyzing trace with hash 597626421, now seen corresponding path program 1 times [2021-11-23 02:15:16,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:16,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761346689] [2021-11-23 02:15:16,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:16,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:16,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:16,150 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:15:16,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:16,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761346689] [2021-11-23 02:15:16,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761346689] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:16,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991246822] [2021-11-23 02:15:16,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:16,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:16,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:16,152 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:16,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:15:16,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:16,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:15:16,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:16,468 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:15:16,469 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:15:16,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991246822] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:15:16,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:15:16,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:15:16,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325788607] [2021-11-23 02:15:16,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:16,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:15:16,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:16,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:15:16,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:15:16,472 INFO L87 Difference]: Start difference. First operand 4312 states and 6077 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:15:16,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:16,904 INFO L93 Difference]: Finished difference Result 7317 states and 10496 transitions. [2021-11-23 02:15:16,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:15:16,905 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 124 [2021-11-23 02:15:16,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:16,922 INFO L225 Difference]: With dead ends: 7317 [2021-11-23 02:15:16,922 INFO L226 Difference]: Without dead ends: 5197 [2021-11-23 02:15:16,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:15:16,936 INFO L933 BasicCegarLoop]: 212 mSDtfsCounter, 200 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:16,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 241 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:15:16,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5197 states. [2021-11-23 02:15:17,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5197 to 5197. [2021-11-23 02:15:17,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5197 states, 4093 states have (on average 1.3642804788663572) internal successors, (5584), 4131 states have internal predecessors, (5584), 651 states have call successors, (651), 433 states have call predecessors, (651), 451 states have return successors, (900), 634 states have call predecessors, (900), 648 states have call successors, (900) [2021-11-23 02:15:17,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5197 states to 5197 states and 7135 transitions. [2021-11-23 02:15:17,499 INFO L78 Accepts]: Start accepts. Automaton has 5197 states and 7135 transitions. Word has length 124 [2021-11-23 02:15:17,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:17,499 INFO L470 AbstractCegarLoop]: Abstraction has 5197 states and 7135 transitions. [2021-11-23 02:15:17,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:15:17,500 INFO L276 IsEmpty]: Start isEmpty. Operand 5197 states and 7135 transitions. [2021-11-23 02:15:17,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:15:17,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:17,514 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:15:17,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:17,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 02:15:17,729 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:17,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:17,730 INFO L85 PathProgramCache]: Analyzing trace with hash 540482196, now seen corresponding path program 1 times [2021-11-23 02:15:17,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:17,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639250291] [2021-11-23 02:15:17,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:17,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:17,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:17,788 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 02:15:17,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:17,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639250291] [2021-11-23 02:15:17,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639250291] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:17,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449664369] [2021-11-23 02:15:17,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:17,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:17,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:17,790 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:17,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:15:17,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:17,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:15:17,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:18,123 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:15:18,124 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:15:18,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449664369] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:15:18,124 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:15:18,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:15:18,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161639482] [2021-11-23 02:15:18,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:18,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:15:18,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:18,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:15:18,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:15:18,125 INFO L87 Difference]: Start difference. First operand 5197 states and 7135 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:15:18,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:18,736 INFO L93 Difference]: Finished difference Result 9198 states and 12997 transitions. [2021-11-23 02:15:18,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:15:18,737 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 124 [2021-11-23 02:15:18,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:18,757 INFO L225 Difference]: With dead ends: 9198 [2021-11-23 02:15:18,757 INFO L226 Difference]: Without dead ends: 6908 [2021-11-23 02:15:18,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:15:18,768 INFO L933 BasicCegarLoop]: 275 mSDtfsCounter, 89 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:18,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 477 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:15:18,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6908 states. [2021-11-23 02:15:19,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6908 to 5795. [2021-11-23 02:15:19,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5795 states, 4635 states have (on average 1.397195253505933) internal successors, (6476), 4673 states have internal predecessors, (6476), 679 states have call successors, (679), 461 states have call predecessors, (679), 479 states have return successors, (928), 662 states have call predecessors, (928), 676 states have call successors, (928) [2021-11-23 02:15:19,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5795 states to 5795 states and 8083 transitions. [2021-11-23 02:15:19,291 INFO L78 Accepts]: Start accepts. Automaton has 5795 states and 8083 transitions. Word has length 124 [2021-11-23 02:15:19,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:19,292 INFO L470 AbstractCegarLoop]: Abstraction has 5795 states and 8083 transitions. [2021-11-23 02:15:19,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:15:19,292 INFO L276 IsEmpty]: Start isEmpty. Operand 5795 states and 8083 transitions. [2021-11-23 02:15:19,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:15:19,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:19,306 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:15:19,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:19,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 02:15:19,533 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:19,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:19,534 INFO L85 PathProgramCache]: Analyzing trace with hash -373576570, now seen corresponding path program 2 times [2021-11-23 02:15:19,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:19,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850167111] [2021-11-23 02:15:19,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:19,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:19,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:19,597 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:15:19,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:19,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850167111] [2021-11-23 02:15:19,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850167111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:19,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442923084] [2021-11-23 02:15:19,598 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:15:19,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:19,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:19,600 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:19,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:15:19,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:15:19,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:19,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:15:19,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:19,922 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:15:19,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:15:19,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442923084] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:15:19,922 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:15:19,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:15:19,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187247373] [2021-11-23 02:15:19,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:19,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:15:19,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:19,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:15:19,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:15:19,926 INFO L87 Difference]: Start difference. First operand 5795 states and 8083 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:15:20,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:20,541 INFO L93 Difference]: Finished difference Result 10960 states and 15854 transitions. [2021-11-23 02:15:20,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:15:20,541 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 124 [2021-11-23 02:15:20,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:20,566 INFO L225 Difference]: With dead ends: 10960 [2021-11-23 02:15:20,566 INFO L226 Difference]: Without dead ends: 7957 [2021-11-23 02:15:20,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:15:20,582 INFO L933 BasicCegarLoop]: 298 mSDtfsCounter, 111 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 487 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:20,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 487 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:15:20,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7957 states. [2021-11-23 02:15:21,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7957 to 7809. [2021-11-23 02:15:21,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7809 states, 6286 states have (on average 1.4000954502068088) internal successors, (8801), 6332 states have internal predecessors, (8801), 897 states have call successors, (897), 607 states have call predecessors, (897), 624 states have return successors, (1341), 871 states have call predecessors, (1341), 894 states have call successors, (1341) [2021-11-23 02:15:21,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7809 states to 7809 states and 11039 transitions. [2021-11-23 02:15:21,273 INFO L78 Accepts]: Start accepts. Automaton has 7809 states and 11039 transitions. Word has length 124 [2021-11-23 02:15:21,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:21,274 INFO L470 AbstractCegarLoop]: Abstraction has 7809 states and 11039 transitions. [2021-11-23 02:15:21,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:15:21,274 INFO L276 IsEmpty]: Start isEmpty. Operand 7809 states and 11039 transitions. [2021-11-23 02:15:21,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 02:15:21,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:21,285 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:15:21,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:21,493 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 02:15:21,493 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:21,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:21,494 INFO L85 PathProgramCache]: Analyzing trace with hash 50856514, now seen corresponding path program 1 times [2021-11-23 02:15:21,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:21,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967003129] [2021-11-23 02:15:21,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:21,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:21,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:21,552 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 02:15:21,553 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:21,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967003129] [2021-11-23 02:15:21,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967003129] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:21,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076403996] [2021-11-23 02:15:21,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:21,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:21,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:21,577 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:21,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:15:21,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:21,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:15:21,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:21,846 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:15:21,846 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:15:21,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076403996] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:15:21,847 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:15:21,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:15:21,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571114159] [2021-11-23 02:15:21,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:21,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:15:21,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:21,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:15:21,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:15:21,849 INFO L87 Difference]: Start difference. First operand 7809 states and 11039 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:15:22,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:22,548 INFO L93 Difference]: Finished difference Result 13984 states and 20260 transitions. [2021-11-23 02:15:22,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:15:22,548 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-23 02:15:22,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:22,572 INFO L225 Difference]: With dead ends: 13984 [2021-11-23 02:15:22,572 INFO L226 Difference]: Without dead ends: 10352 [2021-11-23 02:15:22,584 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:15:22,585 INFO L933 BasicCegarLoop]: 270 mSDtfsCounter, 83 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:22,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 472 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:15:22,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10352 states. [2021-11-23 02:15:23,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10352 to 8981. [2021-11-23 02:15:23,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8981 states, 7338 states have (on average 1.4313164349959118) internal successors, (10503), 7384 states have internal predecessors, (10503), 957 states have call successors, (957), 667 states have call predecessors, (957), 684 states have return successors, (1401), 931 states have call predecessors, (1401), 954 states have call successors, (1401) [2021-11-23 02:15:23,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8981 states to 8981 states and 12861 transitions. [2021-11-23 02:15:23,514 INFO L78 Accepts]: Start accepts. Automaton has 8981 states and 12861 transitions. Word has length 121 [2021-11-23 02:15:23,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:23,514 INFO L470 AbstractCegarLoop]: Abstraction has 8981 states and 12861 transitions. [2021-11-23 02:15:23,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:15:23,515 INFO L276 IsEmpty]: Start isEmpty. Operand 8981 states and 12861 transitions. [2021-11-23 02:15:23,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 02:15:23,521 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:23,521 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 02:15:23,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:23,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 02:15:23,725 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:23,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:23,726 INFO L85 PathProgramCache]: Analyzing trace with hash -521043255, now seen corresponding path program 1 times [2021-11-23 02:15:23,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:23,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576013039] [2021-11-23 02:15:23,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:23,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:23,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:23,785 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-23 02:15:23,785 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:23,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576013039] [2021-11-23 02:15:23,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576013039] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:23,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239503237] [2021-11-23 02:15:23,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:23,786 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:23,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:23,787 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:23,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:15:23,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:23,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:15:23,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:24,074 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:15:24,075 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:15:24,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239503237] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:15:24,075 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:15:24,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:15:24,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670748627] [2021-11-23 02:15:24,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:15:24,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:15:24,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:24,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:15:24,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:15:24,077 INFO L87 Difference]: Start difference. First operand 8981 states and 12861 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:15:24,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:24,847 INFO L93 Difference]: Finished difference Result 16132 states and 23682 transitions. [2021-11-23 02:15:24,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:15:24,847 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-23 02:15:24,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:24,885 INFO L225 Difference]: With dead ends: 16132 [2021-11-23 02:15:24,885 INFO L226 Difference]: Without dead ends: 11854 [2021-11-23 02:15:24,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:15:24,901 INFO L933 BasicCegarLoop]: 276 mSDtfsCounter, 77 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 478 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:24,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 478 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:15:24,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11854 states. [2021-11-23 02:15:25,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11854 to 10679. [2021-11-23 02:15:25,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10679 states, 8856 states have (on average 1.4607046070460705) internal successors, (12936), 8902 states have internal predecessors, (12936), 1047 states have call successors, (1047), 757 states have call predecessors, (1047), 774 states have return successors, (1491), 1021 states have call predecessors, (1491), 1044 states have call successors, (1491) [2021-11-23 02:15:25,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10679 states to 10679 states and 15474 transitions. [2021-11-23 02:15:25,808 INFO L78 Accepts]: Start accepts. Automaton has 10679 states and 15474 transitions. Word has length 121 [2021-11-23 02:15:25,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:25,809 INFO L470 AbstractCegarLoop]: Abstraction has 10679 states and 15474 transitions. [2021-11-23 02:15:25,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:15:25,809 INFO L276 IsEmpty]: Start isEmpty. Operand 10679 states and 15474 transitions. [2021-11-23 02:15:25,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 02:15:25,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:25,819 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:15:25,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:15:26,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:26,019 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:26,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:26,020 INFO L85 PathProgramCache]: Analyzing trace with hash 504977827, now seen corresponding path program 2 times [2021-11-23 02:15:26,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:26,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517192833] [2021-11-23 02:15:26,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:26,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:26,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:15:26,090 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:15:26,091 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:15:26,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517192833] [2021-11-23 02:15:26,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517192833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:15:26,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602458541] [2021-11-23 02:15:26,091 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:15:26,092 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:15:26,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:15:26,093 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:15:26,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:15:26,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:15:26,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:15:26,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:15:26,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:15:26,571 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 56 proven. 10 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:15:26,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:27,012 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 19 proven. 34 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 02:15:27,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602458541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:27,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1949574156] [2021-11-23 02:15:27,015 INFO L159 IcfgInterpreter]: Started Sifa with 64 locations of interest [2021-11-23 02:15:27,015 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:27,016 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:15:27,016 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:15:27,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:15:37,164 INFO L197 IcfgInterpreter]: Interpreting procedure error2 with input of size 79 for LOIs [2021-11-23 02:15:37,171 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events2 with input of size 144 for LOIs [2021-11-23 02:15:37,208 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2021-11-23 02:15:37,674 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2021-11-23 02:18:36,398 WARN L227 SmtUtils]: Spent 2.96m on a formula simplification that was a NOOP. DAG size: 1183 (called from [L 211] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2021-11-23 02:21:32,689 WARN L227 SmtUtils]: Spent 2.94m on a formula simplification that was a NOOP. DAG size: 1183 (called from [L 211] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2021-11-23 02:21:32,694 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread2 with input of size 142 for LOIs [2021-11-23 02:21:32,745 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels2 with input of size 124 for LOIs [2021-11-23 02:21:32,756 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 136 for LOIs [2021-11-23 02:21:33,132 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads2 with input of size 134 for LOIs [2021-11-23 02:21:33,991 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events2 with input of size 144 for LOIs [2021-11-23 02:21:34,024 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:22:28,383 WARN L227 SmtUtils]: Spent 35.37s on a formula simplification. DAG size of input: 1183 DAG size of output: 98 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:22:38,506 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '334157#(and (= ~p_dw_pc~0 0) (= ~c_dr_st~0 0) (= ~p_num_write~0 0) (<= ~local~0 2147483647) (= ~c_num_read~0 0) (= ~q_buf_0~0 0) (= ~t1_pc~0 0) (= ~t1_i~0 1) (not (= ~token~0 (+ ~local~0 4))) (= ~p_last_write~0 0) (<= 0 (+ ~local~0 2147483648)) (= ~c_last_read~0 0) (= 0 ~c_dr_i~0) (= ~q_free~0 0) (= ~q_req_up~0 0) (= ~q_ev~0 0) (= ~m_pc~0 1) (= ~p_dw_i~0 0) (= ~m_i~0 1) (<= ~t3_pc~0 1) (= ~p_dw_st~0 0) (= ~t2_i~0 1) (= ~q_write_ev~0 0) (= ~c_dr_pc~0 0) (= 0 ~t2_pc~0) (= ~q_read_ev~0 0) (= ~m_st~0 1) (= |#NULL.offset| 0) (= ~a_t~0 0) (<= 0 ~t3_pc~0) (= 0 ~t4_pc~0) (= ~t3_i~0 1) (= ~t4_i~0 1) (<= 0 (+ ~token~0 2147483648)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:22:38,506 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:22:38,507 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:22:38,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6] total 13 [2021-11-23 02:22:38,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521768426] [2021-11-23 02:22:38,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:22:38,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:22:38,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:38,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:22:38,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=3252, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:22:38,509 INFO L87 Difference]: Start difference. First operand 10679 states and 15474 transitions. Second operand has 13 states, 13 states have (on average 12.461538461538462) internal successors, (162), 13 states have internal predecessors, (162), 8 states have call successors, (27), 7 states have call predecessors, (27), 8 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-23 02:22:41,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:41,195 INFO L93 Difference]: Finished difference Result 33417 states and 48395 transitions. [2021-11-23 02:22:41,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 02:22:41,195 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 12.461538461538462) internal successors, (162), 13 states have internal predecessors, (162), 8 states have call successors, (27), 7 states have call predecessors, (27), 8 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 121 [2021-11-23 02:22:41,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:41,252 INFO L225 Difference]: With dead ends: 33417 [2021-11-23 02:22:41,253 INFO L226 Difference]: Without dead ends: 23474 [2021-11-23 02:22:41,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 319 SyntacticMatches, 12 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3415 ImplicationChecksByTransitivity, 64.9s TimeCoverageRelationStatistics Valid=923, Invalid=6733, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 02:22:41,281 INFO L933 BasicCegarLoop]: 248 mSDtfsCounter, 1711 mSDsluCounter, 1255 mSDsCounter, 0 mSdLazyCounter, 967 mSolverCounterSat, 690 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1711 SdHoareTripleChecker+Valid, 1297 SdHoareTripleChecker+Invalid, 1657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 690 IncrementalHoareTripleChecker+Valid, 967 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:41,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1711 Valid, 1297 Invalid, 1657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [690 Valid, 967 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:22:41,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23474 states. [2021-11-23 02:22:42,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23474 to 21112. [2021-11-23 02:22:42,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21112 states, 17432 states have (on average 1.4187127122533272) internal successors, (24731), 17510 states have internal predecessors, (24731), 2144 states have call successors, (2144), 1478 states have call predecessors, (2144), 1534 states have return successors, (3037), 2125 states have call predecessors, (3037), 2141 states have call successors, (3037) [2021-11-23 02:22:42,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21112 states to 21112 states and 29912 transitions. [2021-11-23 02:22:42,922 INFO L78 Accepts]: Start accepts. Automaton has 21112 states and 29912 transitions. Word has length 121 [2021-11-23 02:22:42,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:42,923 INFO L470 AbstractCegarLoop]: Abstraction has 21112 states and 29912 transitions. [2021-11-23 02:22:42,923 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 12.461538461538462) internal successors, (162), 13 states have internal predecessors, (162), 8 states have call successors, (27), 7 states have call predecessors, (27), 8 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-23 02:22:42,923 INFO L276 IsEmpty]: Start isEmpty. Operand 21112 states and 29912 transitions. [2021-11-23 02:22:42,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:22:42,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:42,940 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:22:42,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:22:43,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-23 02:22:43,145 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:43,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:43,146 INFO L85 PathProgramCache]: Analyzing trace with hash 907074545, now seen corresponding path program 1 times [2021-11-23 02:22:43,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:43,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996273321] [2021-11-23 02:22:43,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:43,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:43,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:43,221 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 15 proven. 30 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:22:43,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:43,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996273321] [2021-11-23 02:22:43,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996273321] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:22:43,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441338763] [2021-11-23 02:22:43,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:43,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:22:43,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:22:43,238 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:22:43,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:22:43,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:43,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:22:43,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:22:43,516 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:22:43,517 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:22:43,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1441338763] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:43,517 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:22:43,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 02:22:43,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300522260] [2021-11-23 02:22:43,517 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:43,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:22:43,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:43,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:22:43,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:22:43,518 INFO L87 Difference]: Start difference. First operand 21112 states and 29912 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 02:22:45,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:45,048 INFO L93 Difference]: Finished difference Result 30944 states and 43599 transitions. [2021-11-23 02:22:45,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:22:45,048 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 126 [2021-11-23 02:22:45,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:45,099 INFO L225 Difference]: With dead ends: 30944 [2021-11-23 02:22:45,099 INFO L226 Difference]: Without dead ends: 21747 [2021-11-23 02:22:45,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:22:45,122 INFO L933 BasicCegarLoop]: 284 mSDtfsCounter, 222 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 669 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:45,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [222 Valid, 669 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:22:45,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21747 states. [2021-11-23 02:22:46,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21747 to 21389. [2021-11-23 02:22:46,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21389 states, 17664 states have (on average 1.4160439311594204) internal successors, (25013), 17758 states have internal predecessors, (25013), 2152 states have call successors, (2152), 1483 states have call predecessors, (2152), 1571 states have return successors, (3093), 2149 states have call predecessors, (3093), 2149 states have call successors, (3093) [2021-11-23 02:22:46,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21389 states to 21389 states and 30258 transitions. [2021-11-23 02:22:46,799 INFO L78 Accepts]: Start accepts. Automaton has 21389 states and 30258 transitions. Word has length 126 [2021-11-23 02:22:46,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:46,800 INFO L470 AbstractCegarLoop]: Abstraction has 21389 states and 30258 transitions. [2021-11-23 02:22:46,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 02:22:46,800 INFO L276 IsEmpty]: Start isEmpty. Operand 21389 states and 30258 transitions. [2021-11-23 02:22:46,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 02:22:46,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:46,820 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:22:46,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:22:47,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:22:47,033 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:47,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:47,034 INFO L85 PathProgramCache]: Analyzing trace with hash 956732298, now seen corresponding path program 1 times [2021-11-23 02:22:47,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:47,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870709111] [2021-11-23 02:22:47,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:47,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:47,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:47,103 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:22:47,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:47,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870709111] [2021-11-23 02:22:47,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870709111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:22:47,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617075343] [2021-11-23 02:22:47,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:47,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:22:47,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:22:47,105 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:22:47,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:22:47,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:47,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 677 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:22:47,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:22:47,403 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:22:47,403 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:22:47,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617075343] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:47,403 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:22:47,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:22:47,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262431513] [2021-11-23 02:22:47,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:47,404 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:22:47,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:47,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:22:47,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:22:47,405 INFO L87 Difference]: Start difference. First operand 21389 states and 30258 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:22:48,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:48,855 INFO L93 Difference]: Finished difference Result 30654 states and 43380 transitions. [2021-11-23 02:22:48,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:22:48,856 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 127 [2021-11-23 02:22:48,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:48,907 INFO L225 Difference]: With dead ends: 30654 [2021-11-23 02:22:48,908 INFO L226 Difference]: Without dead ends: 21101 [2021-11-23 02:22:48,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:22:48,932 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 28 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:48,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 407 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:22:48,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21101 states. [2021-11-23 02:22:50,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21101 to 21101. [2021-11-23 02:22:50,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21101 states, 17408 states have (on average 1.4171070772058822) internal successors, (24669), 17494 states have internal predecessors, (24669), 2152 states have call successors, (2152), 1483 states have call predecessors, (2152), 1539 states have return successors, (3045), 2125 states have call predecessors, (3045), 2149 states have call successors, (3045) [2021-11-23 02:22:50,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21101 states to 21101 states and 29866 transitions. [2021-11-23 02:22:50,551 INFO L78 Accepts]: Start accepts. Automaton has 21101 states and 29866 transitions. Word has length 127 [2021-11-23 02:22:50,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:50,552 INFO L470 AbstractCegarLoop]: Abstraction has 21101 states and 29866 transitions. [2021-11-23 02:22:50,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:22:50,552 INFO L276 IsEmpty]: Start isEmpty. Operand 21101 states and 29866 transitions. [2021-11-23 02:22:50,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 02:22:50,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:50,566 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:22:50,591 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:22:50,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-23 02:22:50,767 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:50,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:50,767 INFO L85 PathProgramCache]: Analyzing trace with hash 1208385225, now seen corresponding path program 1 times [2021-11-23 02:22:50,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:50,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000362941] [2021-11-23 02:22:50,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:50,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:50,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:50,830 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 16 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:22:50,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:50,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000362941] [2021-11-23 02:22:50,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000362941] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:22:50,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46624240] [2021-11-23 02:22:50,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:50,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:22:50,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:22:50,833 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:22:50,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 02:22:50,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:50,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:22:50,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:22:51,233 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:22:51,233 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:22:51,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46624240] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:51,233 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:22:51,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-23 02:22:51,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433633863] [2021-11-23 02:22:51,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:51,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:22:51,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:51,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:22:51,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:22:51,235 INFO L87 Difference]: Start difference. First operand 21101 states and 29866 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:22:53,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:22:53,702 INFO L93 Difference]: Finished difference Result 49289 states and 69945 transitions. [2021-11-23 02:22:53,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:22:53,703 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2021-11-23 02:22:53,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:22:53,770 INFO L225 Difference]: With dead ends: 49289 [2021-11-23 02:22:53,771 INFO L226 Difference]: Without dead ends: 28969 [2021-11-23 02:22:53,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:22:53,804 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 460 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 483 SdHoareTripleChecker+Valid, 494 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:22:53,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [483 Valid, 494 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:22:53,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28969 states. [2021-11-23 02:22:56,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28969 to 28965. [2021-11-23 02:22:56,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28965 states, 23789 states have (on average 1.3969061330867207) internal successors, (33231), 23911 states have internal predecessors, (33231), 3028 states have call successors, (3028), 2071 states have call predecessors, (3028), 2146 states have return successors, (4307), 2984 states have call predecessors, (4307), 3025 states have call successors, (4307) [2021-11-23 02:22:56,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28965 states to 28965 states and 40566 transitions. [2021-11-23 02:22:56,119 INFO L78 Accepts]: Start accepts. Automaton has 28965 states and 40566 transitions. Word has length 127 [2021-11-23 02:22:56,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:22:56,119 INFO L470 AbstractCegarLoop]: Abstraction has 28965 states and 40566 transitions. [2021-11-23 02:22:56,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:22:56,120 INFO L276 IsEmpty]: Start isEmpty. Operand 28965 states and 40566 transitions. [2021-11-23 02:22:56,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:22:56,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:22:56,140 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:22:56,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:22:56,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:22:56,341 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:22:56,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:22:56,341 INFO L85 PathProgramCache]: Analyzing trace with hash 169455045, now seen corresponding path program 1 times [2021-11-23 02:22:56,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:22:56,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072380795] [2021-11-23 02:22:56,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:56,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:22:56,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:56,609 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:22:56,609 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:22:56,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072380795] [2021-11-23 02:22:56,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072380795] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:22:56,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327464625] [2021-11-23 02:22:56,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:22:56,610 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:22:56,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:22:56,630 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:22:56,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 02:22:56,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:22:56,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:22:56,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:22:57,082 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:22:57,082 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:22:57,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327464625] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:22:57,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:22:57,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-23 02:22:57,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535374654] [2021-11-23 02:22:57,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:22:57,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:22:57,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:57,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:22:57,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:22:57,085 INFO L87 Difference]: Start difference. First operand 28965 states and 40566 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:23:00,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:00,615 INFO L93 Difference]: Finished difference Result 68148 states and 95531 transitions. [2021-11-23 02:23:00,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:23:00,615 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2021-11-23 02:23:00,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:00,729 INFO L225 Difference]: With dead ends: 68148 [2021-11-23 02:23:00,729 INFO L226 Difference]: Without dead ends: 39964 [2021-11-23 02:23:00,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:23:00,772 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 455 mSDsluCounter, 359 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 478 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:00,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [478 Valid, 498 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:23:00,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39964 states. [2021-11-23 02:23:04,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39964 to 39960. [2021-11-23 02:23:04,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39960 states, 32653 states have (on average 1.3757388295103052) internal successors, (44922), 32829 states have internal predecessors, (44922), 4287 states have call successors, (4287), 2915 states have call predecessors, (4287), 3018 states have return successors, (6117), 4217 states have call predecessors, (6117), 4284 states have call successors, (6117) [2021-11-23 02:23:04,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39960 states to 39960 states and 55326 transitions. [2021-11-23 02:23:04,554 INFO L78 Accepts]: Start accepts. Automaton has 39960 states and 55326 transitions. Word has length 129 [2021-11-23 02:23:04,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:04,554 INFO L470 AbstractCegarLoop]: Abstraction has 39960 states and 55326 transitions. [2021-11-23 02:23:04,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:23:04,555 INFO L276 IsEmpty]: Start isEmpty. Operand 39960 states and 55326 transitions. [2021-11-23 02:23:04,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:23:04,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:04,720 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:04,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:04,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-23 02:23:04,929 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:04,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:04,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1175040583, now seen corresponding path program 1 times [2021-11-23 02:23:04,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:04,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652196569] [2021-11-23 02:23:04,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:04,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:04,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:04,990 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:23:04,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:04,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652196569] [2021-11-23 02:23:04,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652196569] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:04,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505940478] [2021-11-23 02:23:04,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:04,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:04,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:04,992 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:05,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 02:23:05,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:05,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:23:05,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:05,361 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:23:05,361 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:23:05,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505940478] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:05,361 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:23:05,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-23 02:23:05,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598388656] [2021-11-23 02:23:05,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:05,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:23:05,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:05,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:23:05,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:23:05,363 INFO L87 Difference]: Start difference. First operand 39960 states and 55326 transitions. Second operand has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:23:10,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:10,881 INFO L93 Difference]: Finished difference Result 94672 states and 131111 transitions. [2021-11-23 02:23:10,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:23:10,881 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2021-11-23 02:23:10,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:11,040 INFO L225 Difference]: With dead ends: 94672 [2021-11-23 02:23:11,040 INFO L226 Difference]: Without dead ends: 55493 [2021-11-23 02:23:11,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:23:11,096 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 620 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 643 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:11,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [643 Valid, 426 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:23:11,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55493 states. [2021-11-23 02:23:16,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55493 to 55489. [2021-11-23 02:23:16,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55489 states, 45122 states have (on average 1.3558352909888747) internal successors, (61178), 45379 states have internal predecessors, (61178), 6095 states have call successors, (6095), 4126 states have call predecessors, (6095), 4270 states have return successors, (8705), 5985 states have call predecessors, (8705), 6092 states have call successors, (8705) [2021-11-23 02:23:16,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55489 states to 55489 states and 75978 transitions. [2021-11-23 02:23:16,628 INFO L78 Accepts]: Start accepts. Automaton has 55489 states and 75978 transitions. Word has length 129 [2021-11-23 02:23:16,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:16,628 INFO L470 AbstractCegarLoop]: Abstraction has 55489 states and 75978 transitions. [2021-11-23 02:23:16,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:23:16,629 INFO L276 IsEmpty]: Start isEmpty. Operand 55489 states and 75978 transitions. [2021-11-23 02:23:16,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 02:23:16,675 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:16,676 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:16,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:16,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-23 02:23:16,881 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:16,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:16,882 INFO L85 PathProgramCache]: Analyzing trace with hash -2119660919, now seen corresponding path program 1 times [2021-11-23 02:23:16,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:16,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347331194] [2021-11-23 02:23:16,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:16,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:16,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:16,972 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 37 proven. 13 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 02:23:16,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:16,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347331194] [2021-11-23 02:23:16,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347331194] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:16,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895330925] [2021-11-23 02:23:16,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:16,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:16,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:16,975 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:16,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2d13a15e-0cda-4465-8de6-be001a2df753/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 02:23:17,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:17,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 710 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:23:17,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:17,392 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:23:17,392 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:23:17,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895330925] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:17,392 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:23:17,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2021-11-23 02:23:17,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825174266] [2021-11-23 02:23:17,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:17,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:23:17,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:17,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:23:17,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:23:17,397 INFO L87 Difference]: Start difference. First operand 55489 states and 75978 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10)