./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/nested6.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/nested6.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9 --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 327b0d5e70f014fe291a4771fe2bbb17cb1148e77fe8f6a261d10a47df8adacc --- 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-6b4ec56 [2022-11-20 19:52:02,275 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 19:52:02,277 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 19:52:02,318 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 19:52:02,322 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 19:52:02,326 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 19:52:02,330 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 19:52:02,335 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 19:52:02,338 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 19:52:02,344 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 19:52:02,345 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 19:52:02,346 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 19:52:02,347 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 19:52:02,348 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 19:52:02,349 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 19:52:02,350 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 19:52:02,351 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 19:52:02,352 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 19:52:02,354 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 19:52:02,356 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 19:52:02,358 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 19:52:02,359 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 19:52:02,361 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 19:52:02,362 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 19:52:02,366 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 19:52:02,366 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 19:52:02,366 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 19:52:02,367 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 19:52:02,368 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 19:52:02,369 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 19:52:02,369 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 19:52:02,370 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 19:52:02,371 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 19:52:02,372 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 19:52:02,374 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 19:52:02,374 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 19:52:02,375 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 19:52:02,375 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 19:52:02,376 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 19:52:02,377 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 19:52:02,378 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 19:52:02,379 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 19:52:02,422 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 19:52:02,424 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 19:52:02,425 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 19:52:02,425 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 19:52:02,427 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 19:52:02,427 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 19:52:02,427 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 19:52:02,427 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 19:52:02,428 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 19:52:02,428 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 19:52:02,429 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 19:52:02,429 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 19:52:02,430 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 19:52:02,430 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 19:52:02,430 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 19:52:02,430 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 19:52:02,430 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 19:52:02,431 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 19:52:02,432 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 19:52:02,432 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 19:52:02,432 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 19:52:02,432 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 19:52:02,433 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 19:52:02,433 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 19:52:02,433 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 19:52:02,433 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 19:52:02,434 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 19:52:02,434 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 19:52:02,435 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 19:52:02,435 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 19:52:02,435 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 19:52:02,435 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 19:52:02,436 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 19:52:02,436 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 19:52:02,436 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 19:52:02,436 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 19:52:02,437 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 19:52:02,437 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 19:52:02,437 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 19:52:02,438 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 19:52:02,438 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 19:52:02,439 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_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 327b0d5e70f014fe291a4771fe2bbb17cb1148e77fe8f6a261d10a47df8adacc [2022-11-20 19:52:02,822 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 19:52:02,870 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 19:52:02,873 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 19:52:02,875 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 19:52:02,876 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 19:52:02,877 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/loop-invgen/nested6.i [2022-11-20 19:52:06,306 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 19:52:06,651 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 19:52:06,652 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/sv-benchmarks/c/loop-invgen/nested6.i [2022-11-20 19:52:06,660 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/data/5501832b1/bea610519d2947a491977acc5d98c1a9/FLAG53494de17 [2022-11-20 19:52:06,688 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/data/5501832b1/bea610519d2947a491977acc5d98c1a9 [2022-11-20 19:52:06,692 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 19:52:06,695 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 19:52:06,700 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 19:52:06,701 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 19:52:06,705 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 19:52:06,706 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:52:06" (1/1) ... [2022-11-20 19:52:06,709 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d7ceaa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:06, skipping insertion in model container [2022-11-20 19:52:06,709 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:52:06" (1/1) ... [2022-11-20 19:52:06,719 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 19:52:06,742 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 19:52:06,968 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_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/sv-benchmarks/c/loop-invgen/nested6.i[893,906] [2022-11-20 19:52:06,989 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 19:52:07,001 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 19:52:07,020 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_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/sv-benchmarks/c/loop-invgen/nested6.i[893,906] [2022-11-20 19:52:07,033 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 19:52:07,048 INFO L208 MainTranslator]: Completed translation [2022-11-20 19:52:07,048 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07 WrapperNode [2022-11-20 19:52:07,048 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 19:52:07,049 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 19:52:07,049 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 19:52:07,049 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 19:52:07,056 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,068 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,087 INFO L138 Inliner]: procedures = 16, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 58 [2022-11-20 19:52:07,087 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 19:52:07,088 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 19:52:07,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 19:52:07,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 19:52:07,099 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,099 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,100 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,100 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,103 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,108 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,109 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,110 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,111 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 19:52:07,112 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 19:52:07,112 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 19:52:07,112 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 19:52:07,113 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (1/1) ... [2022-11-20 19:52:07,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 19:52:07,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:52:07,147 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 19:52:07,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 19:52:07,215 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 19:52:07,215 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 19:52:07,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 19:52:07,216 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 19:52:07,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-20 19:52:07,216 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-20 19:52:07,288 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 19:52:07,291 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 19:52:07,437 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 19:52:07,466 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 19:52:07,467 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-20 19:52:07,470 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:52:07 BoogieIcfgContainer [2022-11-20 19:52:07,470 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 19:52:07,473 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 19:52:07,473 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 19:52:07,477 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 19:52:07,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 07:52:06" (1/3) ... [2022-11-20 19:52:07,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53f1576e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:52:07, skipping insertion in model container [2022-11-20 19:52:07,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:52:07" (2/3) ... [2022-11-20 19:52:07,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53f1576e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:52:07, skipping insertion in model container [2022-11-20 19:52:07,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:52:07" (3/3) ... [2022-11-20 19:52:07,481 INFO L112 eAbstractionObserver]: Analyzing ICFG nested6.i [2022-11-20 19:52:07,505 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 19:52:07,505 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 19:52:07,566 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 19:52:07,574 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;@29acca98, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 19:52:07,574 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 19:52:07,579 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 19:52:07,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 19:52:07,588 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:07,589 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:07,590 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:07,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:07,597 INFO L85 PathProgramCache]: Analyzing trace with hash -561695839, now seen corresponding path program 1 times [2022-11-20 19:52:07,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:07,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082677673] [2022-11-20 19:52:07,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:07,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:07,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:08,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:52:08,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:08,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082677673] [2022-11-20 19:52:08,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082677673] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:52:08,042 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:52:08,043 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 19:52:08,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101427324] [2022-11-20 19:52:08,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:52:08,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:52:08,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:08,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:52:08,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 19:52:08,115 INFO L87 Difference]: Start difference. First operand has 21 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:52:08,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:08,318 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2022-11-20 19:52:08,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 19:52:08,322 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 19:52:08,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:08,332 INFO L225 Difference]: With dead ends: 46 [2022-11-20 19:52:08,332 INFO L226 Difference]: Without dead ends: 22 [2022-11-20 19:52:08,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 19:52:08,340 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 11 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:08,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 53 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:52:08,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-20 19:52:08,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-20 19:52:08,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 19:52:08,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2022-11-20 19:52:08,446 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 10 [2022-11-20 19:52:08,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:08,448 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2022-11-20 19:52:08,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:52:08,449 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2022-11-20 19:52:08,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 19:52:08,452 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:08,452 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:08,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 19:52:08,454 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:08,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:08,456 INFO L85 PathProgramCache]: Analyzing trace with hash -724613692, now seen corresponding path program 1 times [2022-11-20 19:52:08,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:08,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851578884] [2022-11-20 19:52:08,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:08,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:08,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:08,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:52:08,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:08,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851578884] [2022-11-20 19:52:08,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851578884] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:52:08,626 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:52:08,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 19:52:08,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246662517] [2022-11-20 19:52:08,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:52:08,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 19:52:08,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:08,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 19:52:08,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 19:52:08,631 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:52:08,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:08,867 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2022-11-20 19:52:08,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 19:52:08,868 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 19:52:08,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:08,869 INFO L225 Difference]: With dead ends: 33 [2022-11-20 19:52:08,870 INFO L226 Difference]: Without dead ends: 31 [2022-11-20 19:52:08,870 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-20 19:52:08,872 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 13 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:08,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 59 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 19:52:08,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-20 19:52:08,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2022-11-20 19:52:08,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 19:52:08,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-20 19:52:08,892 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 11 [2022-11-20 19:52:08,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:08,892 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-20 19:52:08,893 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:52:08,893 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-20 19:52:08,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 19:52:08,894 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:08,894 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:08,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-20 19:52:08,895 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:08,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:08,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1677400223, now seen corresponding path program 1 times [2022-11-20 19:52:08,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:08,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508490398] [2022-11-20 19:52:08,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:08,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:08,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:09,053 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:52:09,054 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:09,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508490398] [2022-11-20 19:52:09,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508490398] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:52:09,055 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:52:09,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 19:52:09,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153259086] [2022-11-20 19:52:09,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:52:09,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:52:09,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:09,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:52:09,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 19:52:09,058 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 19:52:09,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:09,139 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2022-11-20 19:52:09,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 19:52:09,140 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-11-20 19:52:09,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:09,141 INFO L225 Difference]: With dead ends: 38 [2022-11-20 19:52:09,141 INFO L226 Difference]: Without dead ends: 36 [2022-11-20 19:52:09,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 19:52:09,147 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 6 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:09,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 54 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:52:09,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-20 19:52:09,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-20 19:52:09,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 19:52:09,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2022-11-20 19:52:09,170 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 15 [2022-11-20 19:52:09,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:09,171 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2022-11-20 19:52:09,172 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 19:52:09,172 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2022-11-20 19:52:09,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-20 19:52:09,174 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:09,175 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:09,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-20 19:52:09,178 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:09,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:09,182 INFO L85 PathProgramCache]: Analyzing trace with hash -990865919, now seen corresponding path program 1 times [2022-11-20 19:52:09,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:09,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457781925] [2022-11-20 19:52:09,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:09,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:09,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:09,480 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:52:09,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:09,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457781925] [2022-11-20 19:52:09,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457781925] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 19:52:09,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374628252] [2022-11-20 19:52:09,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:09,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:09,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:52:09,486 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:52:09,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 19:52:09,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:09,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 19:52:09,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:52:09,704 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 19:52:09,704 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:52:09,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374628252] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:52:09,705 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 19:52:09,705 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2022-11-20 19:52:09,705 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476456762] [2022-11-20 19:52:09,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:52:09,706 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:52:09,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:09,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:52:09,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2022-11-20 19:52:09,707 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 19:52:09,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:09,866 INFO L93 Difference]: Finished difference Result 95 states and 125 transitions. [2022-11-20 19:52:09,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 19:52:09,867 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-11-20 19:52:09,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:09,871 INFO L225 Difference]: With dead ends: 95 [2022-11-20 19:52:09,872 INFO L226 Difference]: Without dead ends: 62 [2022-11-20 19:52:09,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-20 19:52:09,883 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 25 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:09,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 61 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:52:09,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-20 19:52:09,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 40. [2022-11-20 19:52:09,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 31 states have internal predecessors, (37), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 19:52:09,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2022-11-20 19:52:09,914 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 19 [2022-11-20 19:52:09,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:09,914 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2022-11-20 19:52:09,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 19:52:09,915 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2022-11-20 19:52:09,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-20 19:52:09,917 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:09,918 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:09,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-20 19:52:10,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:10,125 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:10,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:10,126 INFO L85 PathProgramCache]: Analyzing trace with hash -588741990, now seen corresponding path program 1 times [2022-11-20 19:52:10,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:10,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811085771] [2022-11-20 19:52:10,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:10,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:10,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:10,402 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 19:52:10,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:10,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811085771] [2022-11-20 19:52:10,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811085771] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 19:52:10,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163885550] [2022-11-20 19:52:10,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:10,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:10,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:52:10,411 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:52:10,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 19:52:10,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:10,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 19:52:10,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:52:10,555 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 19:52:10,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:52:10,650 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 19:52:10,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163885550] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:52:10,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [296005911] [2022-11-20 19:52:10,686 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-20 19:52:10,686 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:52:10,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:52:10,698 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:52:10,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:52:12,463 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 19:52:12,470 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:52:13,507 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '754#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:52:13,508 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:52:13,508 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 19:52:13,508 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 13 [2022-11-20 19:52:13,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477696339] [2022-11-20 19:52:13,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 19:52:13,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-20 19:52:13,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:13,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-20 19:52:13,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2022-11-20 19:52:13,511 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-20 19:52:14,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:14,147 INFO L93 Difference]: Finished difference Result 105 states and 140 transitions. [2022-11-20 19:52:14,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-20 19:52:14,148 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 26 [2022-11-20 19:52:14,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:14,155 INFO L225 Difference]: With dead ends: 105 [2022-11-20 19:52:14,155 INFO L226 Difference]: Without dead ends: 82 [2022-11-20 19:52:14,156 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=219, Invalid=1341, Unknown=0, NotChecked=0, Total=1560 [2022-11-20 19:52:14,158 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 53 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:14,159 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 104 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 19:52:14,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-20 19:52:14,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 58. [2022-11-20 19:52:14,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 45 states have internal predecessors, (55), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-20 19:52:14,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 75 transitions. [2022-11-20 19:52:14,203 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 75 transitions. Word has length 26 [2022-11-20 19:52:14,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:14,203 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 75 transitions. [2022-11-20 19:52:14,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-20 19:52:14,206 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 75 transitions. [2022-11-20 19:52:14,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-20 19:52:14,208 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:14,208 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:14,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 19:52:14,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:14,415 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:14,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:14,416 INFO L85 PathProgramCache]: Analyzing trace with hash -733579268, now seen corresponding path program 1 times [2022-11-20 19:52:14,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:14,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283509613] [2022-11-20 19:52:14,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:14,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:14,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:14,592 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-20 19:52:14,593 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:14,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283509613] [2022-11-20 19:52:14,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283509613] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 19:52:14,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428148287] [2022-11-20 19:52:14,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:14,594 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:14,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:52:14,596 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:52:14,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 19:52:14,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:14,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-20 19:52:14,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:52:14,789 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 19:52:14,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:52:14,877 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-20 19:52:14,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [428148287] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:52:14,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1450335742] [2022-11-20 19:52:14,881 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-20 19:52:14,881 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:52:14,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:52:14,882 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:52:14,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:52:16,414 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 19:52:16,419 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:52:17,248 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1257#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:52:17,248 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:52:17,249 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 19:52:17,249 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2022-11-20 19:52:17,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269597135] [2022-11-20 19:52:17,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 19:52:17,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-20 19:52:17,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:17,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-20 19:52:17,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2022-11-20 19:52:17,251 INFO L87 Difference]: Start difference. First operand 58 states and 75 transitions. Second operand has 18 states, 18 states have (on average 2.5) internal successors, (45), 18 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-20 19:52:17,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:17,522 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2022-11-20 19:52:17,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 19:52:17,523 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.5) internal successors, (45), 18 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 34 [2022-11-20 19:52:17,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:17,525 INFO L225 Difference]: With dead ends: 117 [2022-11-20 19:52:17,525 INFO L226 Difference]: Without dead ends: 73 [2022-11-20 19:52:17,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 73 SyntacticMatches, 7 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=166, Invalid=1024, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:52:17,531 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 38 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:17,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 98 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:52:17,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-20 19:52:17,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 63. [2022-11-20 19:52:17,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 47 states have (on average 1.2765957446808511) internal successors, (60), 49 states have internal predecessors, (60), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-20 19:52:17,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 82 transitions. [2022-11-20 19:52:17,563 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 82 transitions. Word has length 34 [2022-11-20 19:52:17,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:17,563 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 82 transitions. [2022-11-20 19:52:17,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.5) internal successors, (45), 18 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-20 19:52:17,564 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 82 transitions. [2022-11-20 19:52:17,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-20 19:52:17,574 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:17,574 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:17,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-20 19:52:17,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:17,780 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:17,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:17,781 INFO L85 PathProgramCache]: Analyzing trace with hash -2108383465, now seen corresponding path program 1 times [2022-11-20 19:52:17,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:17,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075903098] [2022-11-20 19:52:17,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:17,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:17,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:17,910 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-20 19:52:17,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:17,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075903098] [2022-11-20 19:52:17,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075903098] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 19:52:17,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589568693] [2022-11-20 19:52:17,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:17,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:17,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:52:17,915 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:52:17,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 19:52:17,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:17,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 19:52:17,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:52:18,062 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 19:52:18,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:52:18,128 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-20 19:52:18,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589568693] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:52:18,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1103476116] [2022-11-20 19:52:18,131 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-20 19:52:18,132 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:52:18,132 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:52:18,133 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:52:18,133 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:52:19,142 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 42 for LOIs [2022-11-20 19:52:19,231 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:52:20,147 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1772#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:52:20,147 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:52:20,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 19:52:20,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-20 19:52:20,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337527860] [2022-11-20 19:52:20,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 19:52:20,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-20 19:52:20,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:20,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-20 19:52:20,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2022-11-20 19:52:20,153 INFO L87 Difference]: Start difference. First operand 63 states and 82 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-20 19:52:20,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:20,340 INFO L93 Difference]: Finished difference Result 126 states and 166 transitions. [2022-11-20 19:52:20,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 19:52:20,341 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (9), 2 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 36 [2022-11-20 19:52:20,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:20,343 INFO L225 Difference]: With dead ends: 126 [2022-11-20 19:52:20,343 INFO L226 Difference]: Without dead ends: 84 [2022-11-20 19:52:20,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2022-11-20 19:52:20,345 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 55 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:20,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 98 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:52:20,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-20 19:52:20,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 70. [2022-11-20 19:52:20,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 54 states have internal predecessors, (65), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-20 19:52:20,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 93 transitions. [2022-11-20 19:52:20,365 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 93 transitions. Word has length 36 [2022-11-20 19:52:20,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:20,366 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 93 transitions. [2022-11-20 19:52:20,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-20 19:52:20,366 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 93 transitions. [2022-11-20 19:52:20,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-20 19:52:20,368 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:20,368 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:20,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-20 19:52:20,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:20,574 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:20,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:20,574 INFO L85 PathProgramCache]: Analyzing trace with hash -1216896472, now seen corresponding path program 1 times [2022-11-20 19:52:20,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:20,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502210867] [2022-11-20 19:52:20,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:20,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:20,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:20,691 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 28 proven. 1 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-20 19:52:20,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:20,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502210867] [2022-11-20 19:52:20,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502210867] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 19:52:20,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991871675] [2022-11-20 19:52:20,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:20,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:20,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:52:20,694 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:52:20,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 19:52:20,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:52:20,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 19:52:20,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:52:20,906 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 39 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-20 19:52:20,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:52:21,038 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 29 proven. 9 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-20 19:52:21,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [991871675] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:52:21,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [482713403] [2022-11-20 19:52:21,044 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-20 19:52:21,044 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:52:21,045 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:52:21,045 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:52:21,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:52:22,541 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 19:52:22,545 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:52:23,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2374#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:52:23,294 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:52:23,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 19:52:23,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9] total 14 [2022-11-20 19:52:23,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450448702] [2022-11-20 19:52:23,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 19:52:23,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-20 19:52:23,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:23,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-20 19:52:23,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2022-11-20 19:52:23,297 INFO L87 Difference]: Start difference. First operand 70 states and 93 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-20 19:52:24,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:24,104 INFO L93 Difference]: Finished difference Result 151 states and 211 transitions. [2022-11-20 19:52:24,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-20 19:52:24,105 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) Word has length 47 [2022-11-20 19:52:24,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:24,105 INFO L225 Difference]: With dead ends: 151 [2022-11-20 19:52:24,105 INFO L226 Difference]: Without dead ends: 0 [2022-11-20 19:52:24,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 115 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=264, Invalid=1806, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 19:52:24,108 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 59 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:24,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 103 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 19:52:24,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-11-20 19:52:24,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-11-20 19:52:24,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:52:24,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-11-20 19:52:24,110 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 47 [2022-11-20 19:52:24,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:24,110 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-11-20 19:52:24,111 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-20 19:52:24,111 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-11-20 19:52:24,111 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-11-20 19:52:24,114 INFO L805 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-20 19:52:24,126 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-20 19:52:24,320 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:24,323 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-11-20 19:52:25,479 INFO L895 garLoopResultBuilder]: At program point L36-2(lines 36 38) the Hoare annotation is: (let ((.cse0 (* 2 |ULTIMATE.start_main_~i~0#1|))) (and (<= .cse0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|) (<= .cse0 |ULTIMATE.start_main_~k~0#1|))) [2022-11-20 19:52:25,479 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2022-11-20 19:52:25,480 INFO L899 garLoopResultBuilder]: For program point L28(line 28) no Hoare annotation was computed. [2022-11-20 19:52:25,480 INFO L895 garLoopResultBuilder]: At program point L41(line 41) the Hoare annotation is: (and (<= (* 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~k~0#1|) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|)) [2022-11-20 19:52:25,480 INFO L895 garLoopResultBuilder]: At program point L41-1(line 41) the Hoare annotation is: (and (<= (* 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~k~0#1|) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|)) [2022-11-20 19:52:25,480 INFO L895 garLoopResultBuilder]: At program point L37(line 37) the Hoare annotation is: (let ((.cse0 (* 2 |ULTIMATE.start_main_~i~0#1|))) (and (<= .cse0 |ULTIMATE.start_main_~j~0#1|) (<= (+ |ULTIMATE.start_main_~k~0#1| 1) |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~n~0#1|) (<= .cse0 |ULTIMATE.start_main_~k~0#1|))) [2022-11-20 19:52:25,481 INFO L899 garLoopResultBuilder]: For program point L37-1(lines 36 38) no Hoare annotation was computed. [2022-11-20 19:52:25,481 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2022-11-20 19:52:25,481 INFO L895 garLoopResultBuilder]: At program point L33-3(lines 33 45) the Hoare annotation is: (let ((.cse0 (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|)) (.cse1 (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~k~0#1|))) (or (and .cse0 .cse1 (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~j~0#1|)) (and (= |ULTIMATE.start_main_~i~0#1| 0) .cse0 .cse1))) [2022-11-20 19:52:25,481 INFO L899 garLoopResultBuilder]: For program point L29(lines 29 32) no Hoare annotation was computed. [2022-11-20 19:52:25,481 INFO L902 garLoopResultBuilder]: At program point L46(lines 24 48) the Hoare annotation is: true [2022-11-20 19:52:25,481 INFO L899 garLoopResultBuilder]: For program point L42(lines 34 44) no Hoare annotation was computed. [2022-11-20 19:52:25,482 INFO L895 garLoopResultBuilder]: At program point L34-2(lines 34 44) the Hoare annotation is: (and (<= (* 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~k~0#1| |ULTIMATE.start_main_~n~0#1|) (<= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_main_~k~0#1|)) [2022-11-20 19:52:25,482 INFO L902 garLoopResultBuilder]: At program point L47(lines 24 48) the Hoare annotation is: true [2022-11-20 19:52:25,482 INFO L899 garLoopResultBuilder]: For program point L35(lines 35 43) no Hoare annotation was computed. [2022-11-20 19:52:25,482 INFO L899 garLoopResultBuilder]: For program point L18-2(lines 17 22) no Hoare annotation was computed. [2022-11-20 19:52:25,482 INFO L902 garLoopResultBuilder]: At program point __VERIFIER_assertENTRY(lines 17 22) the Hoare annotation is: true [2022-11-20 19:52:25,483 INFO L899 garLoopResultBuilder]: For program point __VERIFIER_assertEXIT(lines 17 22) no Hoare annotation was computed. [2022-11-20 19:52:25,483 INFO L899 garLoopResultBuilder]: For program point L19(line 19) no Hoare annotation was computed. [2022-11-20 19:52:25,483 INFO L899 garLoopResultBuilder]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 19) no Hoare annotation was computed. [2022-11-20 19:52:25,483 INFO L899 garLoopResultBuilder]: For program point L18(lines 18 20) no Hoare annotation was computed. [2022-11-20 19:52:25,487 INFO L444 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:52:25,490 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-20 19:52:25,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 07:52:25 BoogieIcfgContainer [2022-11-20 19:52:25,520 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-20 19:52:25,521 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-20 19:52:25,521 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-20 19:52:25,521 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-20 19:52:25,522 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:52:07" (3/4) ... [2022-11-20 19:52:25,525 INFO L137 WitnessPrinter]: Generating witness for correct program [2022-11-20 19:52:25,531 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2022-11-20 19:52:25,537 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 15 nodes and edges [2022-11-20 19:52:25,537 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2022-11-20 19:52:25,537 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2022-11-20 19:52:25,537 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2022-11-20 19:52:25,566 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/witness.graphml [2022-11-20 19:52:25,566 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-20 19:52:25,567 INFO L158 Benchmark]: Toolchain (without parser) took 18871.78ms. Allocated memory was 132.1MB in the beginning and 302.0MB in the end (delta: 169.9MB). Free memory was 101.5MB in the beginning and 221.9MB in the end (delta: -120.4MB). Peak memory consumption was 50.8MB. Max. memory is 16.1GB. [2022-11-20 19:52:25,567 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 132.1MB. Free memory is still 105.1MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 19:52:25,567 INFO L158 Benchmark]: CACSL2BoogieTranslator took 348.15ms. Allocated memory is still 132.1MB. Free memory was 101.1MB in the beginning and 91.1MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-11-20 19:52:25,568 INFO L158 Benchmark]: Boogie Procedure Inliner took 38.06ms. Allocated memory is still 132.1MB. Free memory was 91.1MB in the beginning and 89.8MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-20 19:52:25,568 INFO L158 Benchmark]: Boogie Preprocessor took 23.44ms. Allocated memory is still 132.1MB. Free memory was 89.8MB in the beginning and 88.6MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 19:52:25,569 INFO L158 Benchmark]: RCFGBuilder took 358.40ms. Allocated memory is still 132.1MB. Free memory was 88.6MB in the beginning and 77.3MB in the end (delta: 11.3MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2022-11-20 19:52:25,569 INFO L158 Benchmark]: TraceAbstraction took 18047.65ms. Allocated memory was 132.1MB in the beginning and 302.0MB in the end (delta: 169.9MB). Free memory was 76.5MB in the beginning and 224.0MB in the end (delta: -147.6MB). Peak memory consumption was 154.3MB. Max. memory is 16.1GB. [2022-11-20 19:52:25,569 INFO L158 Benchmark]: Witness Printer took 45.20ms. Allocated memory is still 302.0MB. Free memory was 224.0MB in the beginning and 221.9MB in the end (delta: 2.1MB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 19:52:25,571 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 132.1MB. Free memory is still 105.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 348.15ms. Allocated memory is still 132.1MB. Free memory was 101.1MB in the beginning and 91.1MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 38.06ms. Allocated memory is still 132.1MB. Free memory was 91.1MB in the beginning and 89.8MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 23.44ms. Allocated memory is still 132.1MB. Free memory was 89.8MB in the beginning and 88.6MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 358.40ms. Allocated memory is still 132.1MB. Free memory was 88.6MB in the beginning and 77.3MB in the end (delta: 11.3MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 18047.65ms. Allocated memory was 132.1MB in the beginning and 302.0MB in the end (delta: 169.9MB). Free memory was 76.5MB in the beginning and 224.0MB in the end (delta: -147.6MB). Peak memory consumption was 154.3MB. Max. memory is 16.1GB. * Witness Printer took 45.20ms. Allocated memory is still 302.0MB. Free memory was 224.0MB in the beginning and 221.9MB in the end (delta: 2.1MB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 17.9s, OverallIterations: 8, TraceHistogramMax: 5, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 286 SdHoareTripleChecker+Valid, 1.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 260 mSDsluCounter, 630 SdHoareTripleChecker+Invalid, 1.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 466 mSDsCounter, 172 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 956 IncrementalHoareTripleChecker+Invalid, 1128 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 172 mSolverCounterUnsat, 164 mSDtfsCounter, 956 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 541 GetRequests, 358 SyntacticMatches, 21 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1668 ImplicationChecksByTransitivity, 5.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=70occurred in iteration=7, InterpolantAutomatonStates: 89, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 8 MinimizatonAttempts, 75 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 65 PreInvPairs, 136 NumberOfFragments, 110 HoareAnnotationTreeSize, 65 FomulaSimplifications, 58 FormulaSimplificationTreeSizeReduction, 0.4s HoareSimplificationTime, 9 FomulaSimplificationsInter, 18196 FormulaSimplificationTreeSizeReductionInter, 0.8s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.4s InterpolantComputationTime, 360 NumberOfCodeBlocks, 360 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 486 ConstructedInterpolants, 0 QuantifiedInterpolants, 1241 SizeOfPredicates, 21 NumberOfNonLiveVariables, 465 ConjunctsInSsa, 31 ConjunctsInUnsatCore, 17 InterpolantComputations, 4 PerfectInterpolantSequences, 389/430 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 33]: Loop Invariant Derived loop invariant: ((k <= n && n <= k) && n <= j) || ((i == 0 && k <= n) && n <= k) - InvariantResult [Line: 34]: Loop Invariant Derived loop invariant: (2 * i <= j && k <= n) && n <= k - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: ((2 * i <= j && k <= n) && j + 1 <= n) && 2 * i <= k RESULT: Ultimate proved your program to be correct! [2022-11-20 19:52:25,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9bd0e4b9-5c73-4ae8-9d5a-c5ed461646aa/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE