./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.14.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.14.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur --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 5519dfe0be74dafaa274c71ed936f0e7133f32a3aa7e45c032b5d5b905afa484 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-26 00:21:06,300 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 00:21:06,302 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 00:21:06,326 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 00:21:06,331 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 00:21:06,335 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 00:21:06,337 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 00:21:06,339 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 00:21:06,341 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 00:21:06,342 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 00:21:06,343 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 00:21:06,345 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 00:21:06,345 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 00:21:06,347 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 00:21:06,348 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 00:21:06,349 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 00:21:06,351 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 00:21:06,352 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 00:21:06,354 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 00:21:06,356 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 00:21:06,358 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 00:21:06,360 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 00:21:06,361 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 00:21:06,363 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 00:21:06,367 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 00:21:06,367 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 00:21:06,368 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 00:21:06,369 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 00:21:06,370 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 00:21:06,371 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 00:21:06,371 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 00:21:06,372 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 00:21:06,373 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 00:21:06,375 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 00:21:06,376 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 00:21:06,376 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 00:21:06,377 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 00:21:06,378 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 00:21:06,378 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 00:21:06,380 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 00:21:06,381 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 00:21:06,382 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-26 00:21:06,410 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 00:21:06,411 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 00:21:06,411 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 00:21:06,412 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 00:21:06,412 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 00:21:06,413 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 00:21:06,413 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 00:21:06,414 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 00:21:06,414 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 00:21:06,414 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 00:21:06,415 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 00:21:06,415 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 00:21:06,415 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 00:21:06,416 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 00:21:06,416 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 00:21:06,416 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 00:21:06,417 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 00:21:06,417 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 00:21:06,418 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 00:21:06,418 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-26 00:21:06,419 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 00:21:06,419 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-26 00:21:06,419 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 00:21:06,420 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 00:21:06,420 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 00:21:06,420 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 00:21:06,421 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-26 00:21:06,421 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 00:21:06,421 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 00:21:06,421 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 00:21:06,422 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 00:21:06,422 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 00:21:06,422 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:21:06,423 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 00:21:06,423 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 00:21:06,423 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 00:21:06,424 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 00:21:06,424 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 00:21:06,424 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 00:21:06,424 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 00:21:06,425 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 00:21:06,425 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5519dfe0be74dafaa274c71ed936f0e7133f32a3aa7e45c032b5d5b905afa484 [2022-11-26 00:21:06,770 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 00:21:06,810 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 00:21:06,813 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 00:21:06,815 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 00:21:06,817 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 00:21:06,819 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.14.cil.c [2022-11-26 00:21:10,090 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 00:21:10,422 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 00:21:10,423 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.14.cil.c [2022-11-26 00:21:10,455 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/data/e046947aa/849fe32c2ebe445da81eff17a7632344/FLAG9c6f3d0d9 [2022-11-26 00:21:10,470 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/data/e046947aa/849fe32c2ebe445da81eff17a7632344 [2022-11-26 00:21:10,473 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 00:21:10,475 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 00:21:10,476 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 00:21:10,476 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 00:21:10,480 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 00:21:10,481 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:21:10" (1/1) ... [2022-11-26 00:21:10,483 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f7be4a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:10, skipping insertion in model container [2022-11-26 00:21:10,483 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:21:10" (1/1) ... [2022-11-26 00:21:10,491 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 00:21:10,536 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 00:21:10,694 WARN L237 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_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.14.cil.c[911,924] [2022-11-26 00:21:10,763 WARN L237 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_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.14.cil.c[8416,8429] [2022-11-26 00:21:10,908 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:21:10,927 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 00:21:10,942 WARN L237 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_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.14.cil.c[911,924] [2022-11-26 00:21:10,994 WARN L237 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_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.14.cil.c[8416,8429] [2022-11-26 00:21:11,083 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:21:11,126 INFO L208 MainTranslator]: Completed translation [2022-11-26 00:21:11,127 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11 WrapperNode [2022-11-26 00:21:11,127 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 00:21:11,129 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 00:21:11,129 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 00:21:11,129 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 00:21:11,138 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,156 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,213 INFO L138 Inliner]: procedures = 79, calls = 98, calls flagged for inlining = 47, calls inlined = 47, statements flattened = 1081 [2022-11-26 00:21:11,213 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 00:21:11,214 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 00:21:11,214 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 00:21:11,214 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 00:21:11,225 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,225 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,231 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,231 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,246 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,262 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,267 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,287 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,293 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 00:21:11,294 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 00:21:11,295 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 00:21:11,295 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 00:21:11,296 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (1/1) ... [2022-11-26 00:21:11,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:21:11,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:21:11,333 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 00:21:11,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 00:21:11,418 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 00:21:11,418 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-26 00:21:11,419 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-26 00:21:11,419 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2022-11-26 00:21:11,419 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2022-11-26 00:21:11,419 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-26 00:21:11,419 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-26 00:21:11,420 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-26 00:21:11,420 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-26 00:21:11,421 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2022-11-26 00:21:11,421 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2022-11-26 00:21:11,421 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-26 00:21:11,421 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-26 00:21:11,422 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-26 00:21:11,422 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-26 00:21:11,422 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2022-11-26 00:21:11,422 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2022-11-26 00:21:11,422 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2022-11-26 00:21:11,423 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2022-11-26 00:21:11,423 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2022-11-26 00:21:11,423 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2022-11-26 00:21:11,424 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-26 00:21:11,424 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-26 00:21:11,425 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 00:21:11,425 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-26 00:21:11,425 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-26 00:21:11,426 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2022-11-26 00:21:11,428 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2022-11-26 00:21:11,429 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 00:21:11,429 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 00:21:11,429 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-26 00:21:11,429 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-26 00:21:11,430 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-26 00:21:11,430 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-26 00:21:11,600 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 00:21:11,603 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 00:21:12,822 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2022-11-26 00:21:12,823 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##55: assume 1 == ~q_free~0;~c_dr_st~0 := 2;~c_dr_pc~0 := 2;~a_t~0 := do_read_c_~a~0#1; [2022-11-26 00:21:12,979 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 00:21:13,775 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 00:21:13,776 INFO L300 CfgBuilder]: Removed 19 assume(true) statements. [2022-11-26 00:21:13,781 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:21:13 BoogieIcfgContainer [2022-11-26 00:21:13,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 00:21:13,787 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 00:21:13,788 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 00:21:13,793 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 00:21:13,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 12:21:10" (1/3) ... [2022-11-26 00:21:13,797 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d661896 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:21:13, skipping insertion in model container [2022-11-26 00:21:13,797 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:21:11" (2/3) ... [2022-11-26 00:21:13,799 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d661896 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:21:13, skipping insertion in model container [2022-11-26 00:21:13,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:21:13" (3/3) ... [2022-11-26 00:21:13,801 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.14.cil.c [2022-11-26 00:21:13,827 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 00:21:13,828 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-26 00:21:13,922 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 00:21:13,930 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@778fed4c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 00:21:13,930 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-26 00:21:13,961 INFO L276 IsEmpty]: Start isEmpty. Operand has 273 states, 211 states have (on average 1.5497630331753554) internal successors, (327), 219 states have internal predecessors, (327), 44 states have call successors, (44), 15 states have call predecessors, (44), 15 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2022-11-26 00:21:13,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-26 00:21:13,975 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:13,976 INFO L195 NwaCegarLoop]: 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] [2022-11-26 00:21:13,976 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:13,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:13,982 INFO L85 PathProgramCache]: Analyzing trace with hash -1796501634, now seen corresponding path program 1 times [2022-11-26 00:21:13,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:13,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024215063] [2022-11-26 00:21:13,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:13,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:14,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:14,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:21:14,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:14,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024215063] [2022-11-26 00:21:14,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024215063] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:14,432 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:21:14,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-26 00:21:14,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246372044] [2022-11-26 00:21:14,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:14,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 00:21:14,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:14,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 00:21:14,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-26 00:21:14,493 INFO L87 Difference]: Start difference. First operand has 273 states, 211 states have (on average 1.5497630331753554) internal successors, (327), 219 states have internal predecessors, (327), 44 states have call successors, (44), 15 states have call predecessors, (44), 15 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:21:15,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:15,141 INFO L93 Difference]: Finished difference Result 668 states and 1008 transitions. [2022-11-26 00:21:15,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-26 00:21:15,144 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2022-11-26 00:21:15,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:15,160 INFO L225 Difference]: With dead ends: 668 [2022-11-26 00:21:15,160 INFO L226 Difference]: Without dead ends: 396 [2022-11-26 00:21:15,166 INFO L412 NwaCegarLoop]: 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 [2022-11-26 00:21:15,170 INFO L413 NwaCegarLoop]: 404 mSDtfsCounter, 465 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 465 SdHoareTripleChecker+Valid, 720 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:15,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [465 Valid, 720 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 00:21:15,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2022-11-26 00:21:15,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 385. [2022-11-26 00:21:15,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 292 states have (on average 1.4623287671232876) internal successors, (427), 297 states have internal predecessors, (427), 64 states have call successors, (64), 29 states have call predecessors, (64), 27 states have return successors, (63), 60 states have call predecessors, (63), 60 states have call successors, (63) [2022-11-26 00:21:15,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 554 transitions. [2022-11-26 00:21:15,265 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 554 transitions. Word has length 44 [2022-11-26 00:21:15,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:15,266 INFO L495 AbstractCegarLoop]: Abstraction has 385 states and 554 transitions. [2022-11-26 00:21:15,266 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:21:15,267 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 554 transitions. [2022-11-26 00:21:15,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-26 00:21:15,269 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:15,269 INFO L195 NwaCegarLoop]: 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] [2022-11-26 00:21:15,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-26 00:21:15,270 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:15,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:15,271 INFO L85 PathProgramCache]: Analyzing trace with hash -185394926, now seen corresponding path program 1 times [2022-11-26 00:21:15,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:15,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251788389] [2022-11-26 00:21:15,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:15,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:15,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:15,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:21:15,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:15,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251788389] [2022-11-26 00:21:15,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251788389] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:15,473 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:21:15,474 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-26 00:21:15,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387230486] [2022-11-26 00:21:15,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:15,476 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 00:21:15,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:15,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 00:21:15,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:15,509 INFO L87 Difference]: Start difference. First operand 385 states and 554 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:21:16,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:16,716 INFO L93 Difference]: Finished difference Result 922 states and 1277 transitions. [2022-11-26 00:21:16,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-26 00:21:16,717 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2022-11-26 00:21:16,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:16,725 INFO L225 Difference]: With dead ends: 922 [2022-11-26 00:21:16,725 INFO L226 Difference]: Without dead ends: 456 [2022-11-26 00:21:16,731 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-11-26 00:21:16,733 INFO L413 NwaCegarLoop]: 475 mSDtfsCounter, 986 mSDsluCounter, 746 mSDsCounter, 0 mSdLazyCounter, 813 mSolverCounterSat, 300 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 995 SdHoareTripleChecker+Valid, 1221 SdHoareTripleChecker+Invalid, 1113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 300 IncrementalHoareTripleChecker+Valid, 813 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:16,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [995 Valid, 1221 Invalid, 1113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [300 Valid, 813 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-26 00:21:16,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2022-11-26 00:21:16,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 371. [2022-11-26 00:21:16,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 278 states have (on average 1.4172661870503598) internal successors, (394), 283 states have internal predecessors, (394), 64 states have call successors, (64), 29 states have call predecessors, (64), 27 states have return successors, (60), 60 states have call predecessors, (60), 60 states have call successors, (60) [2022-11-26 00:21:16,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 518 transitions. [2022-11-26 00:21:16,818 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 518 transitions. Word has length 45 [2022-11-26 00:21:16,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:16,819 INFO L495 AbstractCegarLoop]: Abstraction has 371 states and 518 transitions. [2022-11-26 00:21:16,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:21:16,820 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 518 transitions. [2022-11-26 00:21:16,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-26 00:21:16,830 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:16,830 INFO L195 NwaCegarLoop]: 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] [2022-11-26 00:21:16,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-26 00:21:16,831 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:16,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:16,842 INFO L85 PathProgramCache]: Analyzing trace with hash -1067856178, now seen corresponding path program 1 times [2022-11-26 00:21:16,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:16,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243605533] [2022-11-26 00:21:16,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:16,843 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:16,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:17,176 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:21:17,176 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:17,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243605533] [2022-11-26 00:21:17,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243605533] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:17,179 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:21:17,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-26 00:21:17,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231002996] [2022-11-26 00:21:17,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:17,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-26 00:21:17,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:17,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-26 00:21:17,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-26 00:21:17,182 INFO L87 Difference]: Start difference. First operand 371 states and 518 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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) [2022-11-26 00:21:18,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:18,336 INFO L93 Difference]: Finished difference Result 673 states and 886 transitions. [2022-11-26 00:21:18,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-26 00:21:18,337 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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 46 [2022-11-26 00:21:18,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:18,340 INFO L225 Difference]: With dead ends: 673 [2022-11-26 00:21:18,340 INFO L226 Difference]: Without dead ends: 499 [2022-11-26 00:21:18,341 INFO L412 NwaCegarLoop]: 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 [2022-11-26 00:21:18,342 INFO L413 NwaCegarLoop]: 220 mSDtfsCounter, 561 mSDsluCounter, 776 mSDsCounter, 0 mSdLazyCounter, 1093 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 594 SdHoareTripleChecker+Valid, 996 SdHoareTripleChecker+Invalid, 1207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 1093 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:18,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [594 Valid, 996 Invalid, 1207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 1093 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-26 00:21:18,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2022-11-26 00:21:18,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 473. [2022-11-26 00:21:18,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 346 states have (on average 1.3757225433526012) internal successors, (476), 351 states have internal predecessors, (476), 84 states have call successors, (84), 43 states have call predecessors, (84), 41 states have return successors, (80), 80 states have call predecessors, (80), 80 states have call successors, (80) [2022-11-26 00:21:18,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 640 transitions. [2022-11-26 00:21:18,392 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 640 transitions. Word has length 46 [2022-11-26 00:21:18,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:18,393 INFO L495 AbstractCegarLoop]: Abstraction has 473 states and 640 transitions. [2022-11-26 00:21:18,393 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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) [2022-11-26 00:21:18,393 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 640 transitions. [2022-11-26 00:21:18,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-26 00:21:18,394 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:18,394 INFO L195 NwaCegarLoop]: 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] [2022-11-26 00:21:18,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-26 00:21:18,395 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:18,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:18,395 INFO L85 PathProgramCache]: Analyzing trace with hash -1278044163, now seen corresponding path program 1 times [2022-11-26 00:21:18,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:18,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352554776] [2022-11-26 00:21:18,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:18,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:18,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:18,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:21:18,447 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:18,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352554776] [2022-11-26 00:21:18,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352554776] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:18,447 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:21:18,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-26 00:21:18,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027463745] [2022-11-26 00:21:18,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:18,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:21:18,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:18,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:21:18,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-26 00:21:18,450 INFO L87 Difference]: Start difference. First operand 473 states and 640 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) [2022-11-26 00:21:18,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:18,616 INFO L93 Difference]: Finished difference Result 738 states and 976 transitions. [2022-11-26 00:21:18,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:21:18,617 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 [2022-11-26 00:21:18,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:18,618 INFO L225 Difference]: With dead ends: 738 [2022-11-26 00:21:18,619 INFO L226 Difference]: Without dead ends: 192 [2022-11-26 00:21:18,620 INFO L412 NwaCegarLoop]: 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 [2022-11-26 00:21:18,630 INFO L413 NwaCegarLoop]: 316 mSDtfsCounter, 365 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:18,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [365 Valid, 316 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:21:18,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-11-26 00:21:18,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2022-11-26 00:21:18,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 157 states have (on average 1.535031847133758) internal successors, (241), 159 states have internal predecessors, (241), 28 states have call successors, (28), 7 states have call predecessors, (28), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2022-11-26 00:21:18,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 295 transitions. [2022-11-26 00:21:18,655 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 295 transitions. Word has length 47 [2022-11-26 00:21:18,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:18,657 INFO L495 AbstractCegarLoop]: Abstraction has 192 states and 295 transitions. [2022-11-26 00:21:18,657 INFO L496 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) [2022-11-26 00:21:18,657 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 295 transitions. [2022-11-26 00:21:18,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-26 00:21:18,662 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:18,662 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:21:18,663 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-26 00:21:18,664 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:18,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:18,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1068119296, now seen corresponding path program 1 times [2022-11-26 00:21:18,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:18,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997426480] [2022-11-26 00:21:18,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:18,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:18,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:18,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:21:18,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:18,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997426480] [2022-11-26 00:21:18,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997426480] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:18,866 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:21:18,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-26 00:21:18,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649138177] [2022-11-26 00:21:18,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:18,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 00:21:18,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:18,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 00:21:18,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-26 00:21:18,886 INFO L87 Difference]: Start difference. First operand 192 states and 295 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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) [2022-11-26 00:21:20,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:20,025 INFO L93 Difference]: Finished difference Result 1080 states and 1770 transitions. [2022-11-26 00:21:20,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-26 00:21:20,026 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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 68 [2022-11-26 00:21:20,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:20,040 INFO L225 Difference]: With dead ends: 1080 [2022-11-26 00:21:20,040 INFO L226 Difference]: Without dead ends: 894 [2022-11-26 00:21:20,042 INFO L412 NwaCegarLoop]: 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 [2022-11-26 00:21:20,048 INFO L413 NwaCegarLoop]: 552 mSDtfsCounter, 1337 mSDsluCounter, 821 mSDsCounter, 0 mSdLazyCounter, 605 mSolverCounterSat, 246 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1354 SdHoareTripleChecker+Valid, 1373 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 605 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:20,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1354 Valid, 1373 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [246 Valid, 605 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-26 00:21:20,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 894 states. [2022-11-26 00:21:20,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 894 to 881. [2022-11-26 00:21:20,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 881 states, 737 states have (on average 1.5318860244233379) internal successors, (1129), 742 states have internal predecessors, (1129), 113 states have call successors, (113), 31 states have call predecessors, (113), 30 states have return successors, (173), 108 states have call predecessors, (173), 111 states have call successors, (173) [2022-11-26 00:21:20,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 881 states to 881 states and 1415 transitions. [2022-11-26 00:21:20,187 INFO L78 Accepts]: Start accepts. Automaton has 881 states and 1415 transitions. Word has length 68 [2022-11-26 00:21:20,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:20,187 INFO L495 AbstractCegarLoop]: Abstraction has 881 states and 1415 transitions. [2022-11-26 00:21:20,187 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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) [2022-11-26 00:21:20,187 INFO L276 IsEmpty]: Start isEmpty. Operand 881 states and 1415 transitions. [2022-11-26 00:21:20,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-26 00:21:20,192 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:20,192 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:21:20,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-26 00:21:20,193 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:20,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:20,194 INFO L85 PathProgramCache]: Analyzing trace with hash -460613682, now seen corresponding path program 1 times [2022-11-26 00:21:20,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:20,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794490689] [2022-11-26 00:21:20,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:20,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:20,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:20,446 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 00:21:20,446 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:20,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794490689] [2022-11-26 00:21:20,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794490689] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:21:20,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932968420] [2022-11-26 00:21:20,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:20,447 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:20,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:21:20,451 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:21:20,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 00:21:20,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:20,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 1063 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-26 00:21:20,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:21:20,989 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-26 00:21:20,990 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:21:20,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932968420] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:20,991 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:21:20,991 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-26 00:21:20,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909275326] [2022-11-26 00:21:20,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:20,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:21:20,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:20,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:21:20,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:20,994 INFO L87 Difference]: Start difference. First operand 881 states and 1415 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 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) [2022-11-26 00:21:21,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:21,418 INFO L93 Difference]: Finished difference Result 2615 states and 4327 transitions. [2022-11-26 00:21:21,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:21:21,419 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 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 137 [2022-11-26 00:21:21,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:21,431 INFO L225 Difference]: With dead ends: 2615 [2022-11-26 00:21:21,431 INFO L226 Difference]: Without dead ends: 1740 [2022-11-26 00:21:21,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:21,438 INFO L413 NwaCegarLoop]: 264 mSDtfsCounter, 243 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:21,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [243 Valid, 498 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:21:21,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1740 states. [2022-11-26 00:21:21,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1740 to 1731. [2022-11-26 00:21:21,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1731 states, 1455 states have (on average 1.5285223367697593) internal successors, (2224), 1463 states have internal predecessors, (2224), 215 states have call successors, (215), 61 states have call predecessors, (215), 60 states have return successors, (333), 207 states have call predecessors, (333), 213 states have call successors, (333) [2022-11-26 00:21:21,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1731 states to 1731 states and 2772 transitions. [2022-11-26 00:21:21,674 INFO L78 Accepts]: Start accepts. Automaton has 1731 states and 2772 transitions. Word has length 137 [2022-11-26 00:21:21,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:21,674 INFO L495 AbstractCegarLoop]: Abstraction has 1731 states and 2772 transitions. [2022-11-26 00:21:21,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 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) [2022-11-26 00:21:21,675 INFO L276 IsEmpty]: Start isEmpty. Operand 1731 states and 2772 transitions. [2022-11-26 00:21:21,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-26 00:21:21,681 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:21,681 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:21:21,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-26 00:21:21,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-26 00:21:21,891 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:21,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:21,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1108245330, now seen corresponding path program 1 times [2022-11-26 00:21:21,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:21,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037637429] [2022-11-26 00:21:21,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:21,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:21,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:22,126 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 00:21:22,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:22,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037637429] [2022-11-26 00:21:22,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037637429] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:21:22,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412066791] [2022-11-26 00:21:22,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:22,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:22,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:21:22,130 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:21:22,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 00:21:22,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:22,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-26 00:21:22,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:21:22,593 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-26 00:21:22,595 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:21:22,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412066791] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:22,598 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:21:22,599 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-26 00:21:22,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172776646] [2022-11-26 00:21:22,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:22,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:21:22,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:22,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:21:22,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:22,605 INFO L87 Difference]: Start difference. First operand 1731 states and 2772 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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) [2022-11-26 00:21:23,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:23,113 INFO L93 Difference]: Finished difference Result 5150 states and 8490 transitions. [2022-11-26 00:21:23,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:21:23,114 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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 137 [2022-11-26 00:21:23,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:23,139 INFO L225 Difference]: With dead ends: 5150 [2022-11-26 00:21:23,139 INFO L226 Difference]: Without dead ends: 3425 [2022-11-26 00:21:23,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:23,150 INFO L413 NwaCegarLoop]: 264 mSDtfsCounter, 246 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:23,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [246 Valid, 498 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:21:23,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3425 states. [2022-11-26 00:21:23,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3425 to 3411. [2022-11-26 00:21:23,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3411 states, 2876 states have (on average 1.5243393602225312) internal successors, (4384), 2890 states have internal predecessors, (4384), 414 states have call successors, (414), 121 states have call predecessors, (414), 120 states have return successors, (644), 400 states have call predecessors, (644), 412 states have call successors, (644) [2022-11-26 00:21:23,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3411 states to 3411 states and 5442 transitions. [2022-11-26 00:21:23,526 INFO L78 Accepts]: Start accepts. Automaton has 3411 states and 5442 transitions. Word has length 137 [2022-11-26 00:21:23,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:23,526 INFO L495 AbstractCegarLoop]: Abstraction has 3411 states and 5442 transitions. [2022-11-26 00:21:23,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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) [2022-11-26 00:21:23,527 INFO L276 IsEmpty]: Start isEmpty. Operand 3411 states and 5442 transitions. [2022-11-26 00:21:23,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-26 00:21:23,536 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:23,537 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:21:23,552 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-26 00:21:23,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:23,745 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:23,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:23,746 INFO L85 PathProgramCache]: Analyzing trace with hash -1709577266, now seen corresponding path program 1 times [2022-11-26 00:21:23,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:23,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517310215] [2022-11-26 00:21:23,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:23,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:23,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:24,040 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 00:21:24,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:24,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517310215] [2022-11-26 00:21:24,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517310215] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:21:24,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666110526] [2022-11-26 00:21:24,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:24,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:24,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:21:24,044 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:21:24,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 00:21:24,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:24,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-26 00:21:24,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:21:24,463 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-26 00:21:24,463 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:21:24,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666110526] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:24,464 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:21:24,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-26 00:21:24,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69367390] [2022-11-26 00:21:24,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:24,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:21:24,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:24,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:21:24,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:24,467 INFO L87 Difference]: Start difference. First operand 3411 states and 5442 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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) [2022-11-26 00:21:25,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:25,158 INFO L93 Difference]: Finished difference Result 10160 states and 16675 transitions. [2022-11-26 00:21:25,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:21:25,159 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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 137 [2022-11-26 00:21:25,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:25,211 INFO L225 Difference]: With dead ends: 10160 [2022-11-26 00:21:25,211 INFO L226 Difference]: Without dead ends: 6755 [2022-11-26 00:21:25,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:25,240 INFO L413 NwaCegarLoop]: 264 mSDtfsCounter, 264 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:25,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 498 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:21:25,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6755 states. [2022-11-26 00:21:25,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6755 to 6731. [2022-11-26 00:21:25,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6731 states, 5688 states have (on average 1.5196905766526019) internal successors, (8644), 5714 states have internal predecessors, (8644), 802 states have call successors, (802), 241 states have call predecessors, (802), 240 states have return successors, (1248), 776 states have call predecessors, (1248), 800 states have call successors, (1248) [2022-11-26 00:21:25,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6731 states to 6731 states and 10694 transitions. [2022-11-26 00:21:25,961 INFO L78 Accepts]: Start accepts. Automaton has 6731 states and 10694 transitions. Word has length 137 [2022-11-26 00:21:25,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:25,962 INFO L495 AbstractCegarLoop]: Abstraction has 6731 states and 10694 transitions. [2022-11-26 00:21:25,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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) [2022-11-26 00:21:25,962 INFO L276 IsEmpty]: Start isEmpty. Operand 6731 states and 10694 transitions. [2022-11-26 00:21:25,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-26 00:21:25,975 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:25,976 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:21:25,988 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-26 00:21:26,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:26,183 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:26,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:26,184 INFO L85 PathProgramCache]: Analyzing trace with hash -18691346, now seen corresponding path program 1 times [2022-11-26 00:21:26,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:26,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822211010] [2022-11-26 00:21:26,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:26,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:26,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:26,382 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 00:21:26,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:26,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822211010] [2022-11-26 00:21:26,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822211010] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:21:26,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115127931] [2022-11-26 00:21:26,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:26,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:26,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:21:26,384 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:21:26,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 00:21:26,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:26,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-26 00:21:26,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:21:26,811 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-26 00:21:26,812 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:21:26,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115127931] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:26,812 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:21:26,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-26 00:21:26,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999562588] [2022-11-26 00:21:26,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:26,814 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:21:26,814 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:26,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:21:26,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:26,815 INFO L87 Difference]: Start difference. First operand 6731 states and 10694 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2022-11-26 00:21:28,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:28,099 INFO L93 Difference]: Finished difference Result 20060 states and 32763 transitions. [2022-11-26 00:21:28,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:21:28,099 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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 137 [2022-11-26 00:21:28,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:28,201 INFO L225 Difference]: With dead ends: 20060 [2022-11-26 00:21:28,201 INFO L226 Difference]: Without dead ends: 13335 [2022-11-26 00:21:28,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:28,329 INFO L413 NwaCegarLoop]: 264 mSDtfsCounter, 267 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:28,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 498 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:21:28,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13335 states. [2022-11-26 00:21:29,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13335 to 13291. [2022-11-26 00:21:29,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13291 states, 11252 states have (on average 1.5147529328119445) internal successors, (17044), 11302 states have internal predecessors, (17044), 1558 states have call successors, (1558), 481 states have call predecessors, (1558), 480 states have return successors, (2420), 1508 states have call predecessors, (2420), 1556 states have call successors, (2420) [2022-11-26 00:21:29,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13291 states to 13291 states and 21022 transitions. [2022-11-26 00:21:29,792 INFO L78 Accepts]: Start accepts. Automaton has 13291 states and 21022 transitions. Word has length 137 [2022-11-26 00:21:29,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:29,792 INFO L495 AbstractCegarLoop]: Abstraction has 13291 states and 21022 transitions. [2022-11-26 00:21:29,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2022-11-26 00:21:29,794 INFO L276 IsEmpty]: Start isEmpty. Operand 13291 states and 21022 transitions. [2022-11-26 00:21:29,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-26 00:21:29,826 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:29,827 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:21:29,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-26 00:21:30,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:30,036 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:30,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:30,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1787303886, now seen corresponding path program 1 times [2022-11-26 00:21:30,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:30,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442418254] [2022-11-26 00:21:30,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:30,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:30,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:30,336 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 00:21:30,337 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:30,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442418254] [2022-11-26 00:21:30,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442418254] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:21:30,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267807489] [2022-11-26 00:21:30,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:30,338 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:30,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:21:30,340 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:21:30,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 00:21:30,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:30,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-26 00:21:30,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:21:30,756 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-26 00:21:30,756 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:21:30,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267807489] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:30,757 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:21:30,757 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-26 00:21:30,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836451088] [2022-11-26 00:21:30,758 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:30,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:21:30,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:30,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:21:30,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:30,760 INFO L87 Difference]: Start difference. First operand 13291 states and 21022 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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) [2022-11-26 00:21:33,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:33,037 INFO L93 Difference]: Finished difference Result 39620 states and 64375 transitions. [2022-11-26 00:21:33,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:21:33,038 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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 137 [2022-11-26 00:21:33,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:33,226 INFO L225 Difference]: With dead ends: 39620 [2022-11-26 00:21:33,226 INFO L226 Difference]: Without dead ends: 26335 [2022-11-26 00:21:33,297 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:33,299 INFO L413 NwaCegarLoop]: 264 mSDtfsCounter, 258 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:33,301 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [258 Valid, 498 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:21:33,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26335 states. [2022-11-26 00:21:35,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26335 to 26251. [2022-11-26 00:21:35,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26251 states, 22260 states have (on average 1.5096136567834681) internal successors, (33604), 22358 states have internal predecessors, (33604), 3030 states have call successors, (3030), 961 states have call predecessors, (3030), 960 states have return successors, (4692), 2932 states have call predecessors, (4692), 3028 states have call successors, (4692) [2022-11-26 00:21:36,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26251 states to 26251 states and 41326 transitions. [2022-11-26 00:21:36,024 INFO L78 Accepts]: Start accepts. Automaton has 26251 states and 41326 transitions. Word has length 137 [2022-11-26 00:21:36,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:36,025 INFO L495 AbstractCegarLoop]: Abstraction has 26251 states and 41326 transitions. [2022-11-26 00:21:36,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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) [2022-11-26 00:21:36,026 INFO L276 IsEmpty]: Start isEmpty. Operand 26251 states and 41326 transitions. [2022-11-26 00:21:36,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-26 00:21:36,072 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:36,072 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:21:36,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-26 00:21:36,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:36,282 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:36,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:36,282 INFO L85 PathProgramCache]: Analyzing trace with hash -760295698, now seen corresponding path program 1 times [2022-11-26 00:21:36,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:36,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438728973] [2022-11-26 00:21:36,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:36,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:36,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:36,477 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 00:21:36,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:36,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438728973] [2022-11-26 00:21:36,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438728973] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:21:36,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754890291] [2022-11-26 00:21:36,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:36,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:21:36,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:21:36,480 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:21:36,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 00:21:36,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:36,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-26 00:21:36,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:21:36,918 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-26 00:21:36,918 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:21:36,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754890291] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:36,919 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:21:36,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-26 00:21:36,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505848857] [2022-11-26 00:21:36,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:36,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:21:36,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:36,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:21:36,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:36,924 INFO L87 Difference]: Start difference. First operand 26251 states and 41326 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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) [2022-11-26 00:21:40,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:40,552 INFO L93 Difference]: Finished difference Result 78260 states and 126471 transitions. [2022-11-26 00:21:40,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:21:40,553 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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 137 [2022-11-26 00:21:40,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:41,122 INFO L225 Difference]: With dead ends: 78260 [2022-11-26 00:21:41,122 INFO L226 Difference]: Without dead ends: 52015 [2022-11-26 00:21:41,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:41,275 INFO L413 NwaCegarLoop]: 264 mSDtfsCounter, 252 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:41,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 498 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:21:41,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52015 states. [2022-11-26 00:21:45,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52015 to 51851. [2022-11-26 00:21:45,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51851 states, 44036 states have (on average 1.5043146516486512) internal successors, (66244), 44230 states have internal predecessors, (66244), 5894 states have call successors, (5894), 1921 states have call predecessors, (5894), 1920 states have return successors, (9092), 5700 states have call predecessors, (9092), 5892 states have call successors, (9092) [2022-11-26 00:21:46,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51851 states to 51851 states and 81230 transitions. [2022-11-26 00:21:46,154 INFO L78 Accepts]: Start accepts. Automaton has 51851 states and 81230 transitions. Word has length 137 [2022-11-26 00:21:46,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:21:46,155 INFO L495 AbstractCegarLoop]: Abstraction has 51851 states and 81230 transitions. [2022-11-26 00:21:46,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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) [2022-11-26 00:21:46,155 INFO L276 IsEmpty]: Start isEmpty. Operand 51851 states and 81230 transitions. [2022-11-26 00:21:46,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-26 00:21:46,247 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:21:46,248 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:21:46,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-26 00:21:46,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c2abf6c-2398-4c62-9f72-bb9fdf86ee7a/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-26 00:21:46,457 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:21:46,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:21:46,458 INFO L85 PathProgramCache]: Analyzing trace with hash 796220942, now seen corresponding path program 1 times [2022-11-26 00:21:46,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:21:46,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366285531] [2022-11-26 00:21:46,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:21:46,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:21:46,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:21:47,252 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-26 00:21:47,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:21:47,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366285531] [2022-11-26 00:21:47,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366285531] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:21:47,253 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:21:47,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-26 00:21:47,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524044535] [2022-11-26 00:21:47,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:21:47,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 00:21:47,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:21:47,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 00:21:47,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:21:47,256 INFO L87 Difference]: Start difference. First operand 51851 states and 81230 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-26 00:21:55,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:21:55,132 INFO L93 Difference]: Finished difference Result 145299 states and 229460 transitions. [2022-11-26 00:21:55,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 00:21:55,140 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2022-11-26 00:21:55,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:21:55,853 INFO L225 Difference]: With dead ends: 145299 [2022-11-26 00:21:55,853 INFO L226 Difference]: Without dead ends: 93455 [2022-11-26 00:21:56,470 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-26 00:21:56,471 INFO L413 NwaCegarLoop]: 290 mSDtfsCounter, 1007 mSDsluCounter, 563 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1014 SdHoareTripleChecker+Valid, 853 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:21:56,472 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1014 Valid, 853 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 00:21:56,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93455 states. [2022-11-26 00:22:03,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93455 to 82187. [2022-11-26 00:22:03,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82187 states, 69764 states have (on average 1.4981365747376871) internal successors, (104516), 70086 states have internal predecessors, (104516), 9350 states have call successors, (9350), 3073 states have call predecessors, (9350), 3072 states have return successors, (14852), 9028 states have call predecessors, (14852), 9348 states have call successors, (14852) [2022-11-26 00:22:04,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82187 states to 82187 states and 128718 transitions. [2022-11-26 00:22:04,041 INFO L78 Accepts]: Start accepts. Automaton has 82187 states and 128718 transitions. Word has length 137 [2022-11-26 00:22:04,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:22:04,043 INFO L495 AbstractCegarLoop]: Abstraction has 82187 states and 128718 transitions. [2022-11-26 00:22:04,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-26 00:22:04,043 INFO L276 IsEmpty]: Start isEmpty. Operand 82187 states and 128718 transitions. [2022-11-26 00:22:04,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-11-26 00:22:04,186 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:22:04,187 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:22:04,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-26 00:22:04,187 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:22:04,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:22:04,188 INFO L85 PathProgramCache]: Analyzing trace with hash 1052156983, now seen corresponding path program 1 times [2022-11-26 00:22:04,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:22:04,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562559240] [2022-11-26 00:22:04,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:22:04,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:22:04,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:22:05,314 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-26 00:22:05,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:22:05,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562559240] [2022-11-26 00:22:05,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562559240] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:22:05,315 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:22:05,315 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-26 00:22:05,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448752057] [2022-11-26 00:22:05,316 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:22:05,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 00:22:05,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:22:05,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 00:22:05,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:22:05,318 INFO L87 Difference]: Start difference. First operand 82187 states and 128718 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)