./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a 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_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI --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 ebe8677bb7c1f5255df364410243bb239a688bf1d1729cbbc508fc2f6afa38f5 --- 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-5e519f3 [2022-11-03 03:28:36,078 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:28:36,081 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:28:36,142 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:28:36,143 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:28:36,149 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:28:36,150 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:28:36,152 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:28:36,155 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:28:36,156 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:28:36,157 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:28:36,169 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:28:36,169 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:28:36,171 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:28:36,172 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:28:36,173 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:28:36,175 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:28:36,176 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:28:36,182 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:28:36,194 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:28:36,196 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:28:36,206 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:28:36,208 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:28:36,209 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:28:36,213 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:28:36,214 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:28:36,214 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:28:36,215 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:28:36,220 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:28:36,221 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:28:36,222 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:28:36,223 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:28:36,226 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:28:36,227 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:28:36,229 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:28:36,229 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:28:36,230 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:28:36,230 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:28:36,231 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:28:36,232 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:28:36,233 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:28:36,234 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 03:28:36,281 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:28:36,281 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:28:36,287 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:28:36,288 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:28:36,289 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:28:36,289 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:28:36,289 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:28:36,290 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:28:36,290 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:28:36,290 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 03:28:36,291 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:28:36,292 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:28:36,292 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 03:28:36,292 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 03:28:36,292 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:28:36,293 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 03:28:36,293 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 03:28:36,293 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 03:28:36,294 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:28:36,294 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:28:36,294 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:28:36,295 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:28:36,295 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:28:36,297 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 03:28:36,297 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:28:36,298 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 03:28:36,298 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:28:36,298 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 03:28:36,298 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:28:36,299 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 03:28:36,299 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:28:36,299 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:28:36,300 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:28:36,300 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:28:36,300 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 03:28:36,300 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:28:36,301 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 03:28:36,301 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 03:28:36,301 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 03:28:36,301 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 03:28:36,302 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:28:36,302 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_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ebe8677bb7c1f5255df364410243bb239a688bf1d1729cbbc508fc2f6afa38f5 [2022-11-03 03:28:36,700 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:28:36,740 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:28:36,743 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:28:36,756 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:28:36,757 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:28:36,758 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-1.c [2022-11-03 03:28:36,847 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/data/3a5daeef3/bb2c8926abe84f419c11640056e4cb02/FLAGef76a3adc [2022-11-03 03:28:37,583 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:28:37,584 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-1.c [2022-11-03 03:28:37,615 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/data/3a5daeef3/bb2c8926abe84f419c11640056e4cb02/FLAGef76a3adc [2022-11-03 03:28:37,872 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/data/3a5daeef3/bb2c8926abe84f419c11640056e4cb02 [2022-11-03 03:28:37,876 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:28:37,881 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:28:37,885 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:28:37,885 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:28:37,890 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:28:37,891 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:28:37" (1/1) ... [2022-11-03 03:28:37,892 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4fd9f7ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:37, skipping insertion in model container [2022-11-03 03:28:37,893 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:28:37" (1/1) ... [2022-11-03 03:28:37,902 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:28:37,956 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:28:38,195 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-1.c[913,926] [2022-11-03 03:28:38,251 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-1.c[5977,5990] [2022-11-03 03:28:38,338 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:28:38,350 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 03:28:38,364 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-1.c[913,926] [2022-11-03 03:28:38,383 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-1.c[5977,5990] [2022-11-03 03:28:38,435 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:28:38,460 INFO L208 MainTranslator]: Completed translation [2022-11-03 03:28:38,461 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38 WrapperNode [2022-11-03 03:28:38,461 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:28:38,462 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 03:28:38,462 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 03:28:38,462 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 03:28:38,476 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,509 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,589 INFO L138 Inliner]: procedures = 60, calls = 67, calls flagged for inlining = 34, calls inlined = 34, statements flattened = 712 [2022-11-03 03:28:38,589 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 03:28:38,590 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 03:28:38,590 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 03:28:38,591 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 03:28:38,618 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,619 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,622 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,623 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,650 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,676 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,679 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,682 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,687 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 03:28:38,688 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 03:28:38,688 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 03:28:38,689 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 03:28:38,690 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (1/1) ... [2022-11-03 03:28:38,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:28:38,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:28:38,756 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 03:28:38,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 03:28:38,814 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 03:28:38,814 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-03 03:28:38,815 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-03 03:28:38,815 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2022-11-03 03:28:38,815 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2022-11-03 03:28:38,815 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-03 03:28:38,816 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-03 03:28:38,816 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-03 03:28:38,816 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-03 03:28:38,816 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-03 03:28:38,817 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-03 03:28:38,817 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-03 03:28:38,817 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-03 03:28:38,817 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-03 03:28:38,817 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-03 03:28:38,818 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 03:28:38,818 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-03 03:28:38,818 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-03 03:28:38,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 03:28:38,819 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 03:28:38,819 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-03 03:28:38,819 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-03 03:28:38,819 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-03 03:28:38,819 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-03 03:28:38,964 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 03:28:38,967 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 03:28:39,985 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 03:28:40,426 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 03:28:40,427 INFO L300 CfgBuilder]: Removed 13 assume(true) statements. [2022-11-03 03:28:40,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:28:40 BoogieIcfgContainer [2022-11-03 03:28:40,431 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 03:28:40,434 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 03:28:40,434 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 03:28:40,439 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 03:28:40,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 03:28:37" (1/3) ... [2022-11-03 03:28:40,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1594bbbb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:28:40, skipping insertion in model container [2022-11-03 03:28:40,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:28:38" (2/3) ... [2022-11-03 03:28:40,441 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1594bbbb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:28:40, skipping insertion in model container [2022-11-03 03:28:40,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:28:40" (3/3) ... [2022-11-03 03:28:40,443 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.06.cil-1.c [2022-11-03 03:28:40,468 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 03:28:40,469 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-03 03:28:40,567 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 03:28:40,586 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;@4d499cc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 03:28:40,586 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-03 03:28:40,601 INFO L276 IsEmpty]: Start isEmpty. Operand has 179 states, 138 states have (on average 1.5579710144927537) internal successors, (215), 145 states have internal predecessors, (215), 28 states have call successors, (28), 10 states have call predecessors, (28), 10 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-03 03:28:40,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-03 03:28:40,621 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:28:40,622 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:28:40,624 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:28:40,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:28:40,634 INFO L85 PathProgramCache]: Analyzing trace with hash 671133741, now seen corresponding path program 1 times [2022-11-03 03:28:40,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:28:40,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020691603] [2022-11-03 03:28:40,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:28:40,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:28:40,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:28:41,110 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:28:41,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:28:41,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020691603] [2022-11-03 03:28:41,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020691603] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:28:41,113 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:28:41,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:28:41,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170292694] [2022-11-03 03:28:41,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:28:41,124 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:28:41,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:28:41,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:28:41,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:41,177 INFO L87 Difference]: Start difference. First operand has 179 states, 138 states have (on average 1.5579710144927537) internal successors, (215), 145 states have internal predecessors, (215), 28 states have call successors, (28), 10 states have call predecessors, (28), 10 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:28:41,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:28:41,496 INFO L93 Difference]: Finished difference Result 390 states and 590 transitions. [2022-11-03 03:28:41,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:28:41,499 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-11-03 03:28:41,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:28:41,513 INFO L225 Difference]: With dead ends: 390 [2022-11-03 03:28:41,513 INFO L226 Difference]: Without dead ends: 211 [2022-11-03 03:28:41,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:41,523 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 236 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:28:41,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [236 Valid, 285 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:28:41,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-11-03 03:28:41,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 207. [2022-11-03 03:28:41,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 164 states have (on average 1.475609756097561) internal successors, (242), 168 states have internal predecessors, (242), 31 states have call successors, (31), 12 states have call predecessors, (31), 10 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2022-11-03 03:28:41,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 300 transitions. [2022-11-03 03:28:41,604 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 300 transitions. Word has length 28 [2022-11-03 03:28:41,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:28:41,605 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 300 transitions. [2022-11-03 03:28:41,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:28:41,606 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 300 transitions. [2022-11-03 03:28:41,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 03:28:41,609 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:28:41,609 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:28:41,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 03:28:41,610 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:28:41,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:28:41,611 INFO L85 PathProgramCache]: Analyzing trace with hash 1979051324, now seen corresponding path program 1 times [2022-11-03 03:28:41,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:28:41,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388788730] [2022-11-03 03:28:41,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:28:41,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:28:41,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:28:41,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:28:41,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:28:41,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388788730] [2022-11-03 03:28:41,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388788730] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:28:41,816 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:28:41,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:28:41,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360137918] [2022-11-03 03:28:41,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:28:41,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:28:41,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:28:41,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:28:41,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:41,828 INFO L87 Difference]: Start difference. First operand 207 states and 300 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:28:42,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:28:42,040 INFO L93 Difference]: Finished difference Result 363 states and 517 transitions. [2022-11-03 03:28:42,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:28:42,041 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2022-11-03 03:28:42,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:28:42,045 INFO L225 Difference]: With dead ends: 363 [2022-11-03 03:28:42,045 INFO L226 Difference]: Without dead ends: 282 [2022-11-03 03:28:42,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:42,048 INFO L413 NwaCegarLoop]: 217 mSDtfsCounter, 234 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:28:42,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 270 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:28:42,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2022-11-03 03:28:42,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 278. [2022-11-03 03:28:42,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 224 states have (on average 1.4419642857142858) internal successors, (323), 228 states have internal predecessors, (323), 38 states have call successors, (38), 16 states have call predecessors, (38), 14 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2022-11-03 03:28:42,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 395 transitions. [2022-11-03 03:28:42,098 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 395 transitions. Word has length 29 [2022-11-03 03:28:42,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:28:42,099 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 395 transitions. [2022-11-03 03:28:42,100 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:28:42,100 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 395 transitions. [2022-11-03 03:28:42,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-03 03:28:42,102 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:28:42,103 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:28:42,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 03:28:42,103 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:28:42,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:28:42,104 INFO L85 PathProgramCache]: Analyzing trace with hash -451682519, now seen corresponding path program 1 times [2022-11-03 03:28:42,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:28:42,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486033710] [2022-11-03 03:28:42,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:28:42,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:28:42,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:28:42,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:28:42,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:28:42,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486033710] [2022-11-03 03:28:42,260 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486033710] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:28:42,261 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:28:42,261 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:28:42,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790056661] [2022-11-03 03:28:42,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:28:42,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:28:42,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:28:42,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:28:42,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:42,264 INFO L87 Difference]: Start difference. First operand 278 states and 395 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:28:42,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:28:42,509 INFO L93 Difference]: Finished difference Result 518 states and 723 transitions. [2022-11-03 03:28:42,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:28:42,510 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2022-11-03 03:28:42,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:28:42,520 INFO L225 Difference]: With dead ends: 518 [2022-11-03 03:28:42,520 INFO L226 Difference]: Without dead ends: 366 [2022-11-03 03:28:42,529 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:42,531 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 46 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:28:42,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 425 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:28:42,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2022-11-03 03:28:42,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 352. [2022-11-03 03:28:42,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 287 states have (on average 1.421602787456446) internal successors, (408), 293 states have internal predecessors, (408), 44 states have call successors, (44), 21 states have call predecessors, (44), 19 states have return successors, (40), 38 states have call predecessors, (40), 40 states have call successors, (40) [2022-11-03 03:28:42,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 492 transitions. [2022-11-03 03:28:42,638 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 492 transitions. Word has length 30 [2022-11-03 03:28:42,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:28:42,639 INFO L495 AbstractCegarLoop]: Abstraction has 352 states and 492 transitions. [2022-11-03 03:28:42,639 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:28:42,639 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 492 transitions. [2022-11-03 03:28:42,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 03:28:42,645 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:28:42,647 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:28:42,648 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-03 03:28:42,648 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:28:42,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:28:42,649 INFO L85 PathProgramCache]: Analyzing trace with hash -1819075666, now seen corresponding path program 1 times [2022-11-03 03:28:42,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:28:42,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267279894] [2022-11-03 03:28:42,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:28:42,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:28:42,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:28:42,769 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:28:42,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:28:42,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267279894] [2022-11-03 03:28:42,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267279894] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:28:42,771 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:28:42,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:28:42,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848543004] [2022-11-03 03:28:42,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:28:42,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:28:42,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:28:42,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:28:42,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:42,774 INFO L87 Difference]: Start difference. First operand 352 states and 492 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 03:28:42,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:28:42,957 INFO L93 Difference]: Finished difference Result 515 states and 710 transitions. [2022-11-03 03:28:42,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:28:42,958 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2022-11-03 03:28:42,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:28:42,963 INFO L225 Difference]: With dead ends: 515 [2022-11-03 03:28:42,963 INFO L226 Difference]: Without dead ends: 357 [2022-11-03 03:28:42,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:42,978 INFO L413 NwaCegarLoop]: 246 mSDtfsCounter, 32 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:28:42,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 457 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:28:42,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2022-11-03 03:28:43,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 346. [2022-11-03 03:28:43,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 346 states, 281 states have (on average 1.402135231316726) internal successors, (394), 287 states have internal predecessors, (394), 44 states have call successors, (44), 21 states have call predecessors, (44), 19 states have return successors, (40), 38 states have call predecessors, (40), 40 states have call successors, (40) [2022-11-03 03:28:43,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 478 transitions. [2022-11-03 03:28:43,043 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 478 transitions. Word has length 43 [2022-11-03 03:28:43,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:28:43,044 INFO L495 AbstractCegarLoop]: Abstraction has 346 states and 478 transitions. [2022-11-03 03:28:43,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 03:28:43,045 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 478 transitions. [2022-11-03 03:28:43,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-03 03:28:43,059 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:28:43,059 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:28:43,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-03 03:28:43,060 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:28:43,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:28:43,061 INFO L85 PathProgramCache]: Analyzing trace with hash 1062179341, now seen corresponding path program 1 times [2022-11-03 03:28:43,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:28:43,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424646624] [2022-11-03 03:28:43,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:28:43,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:28:43,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:28:43,194 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 03:28:43,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:28:43,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424646624] [2022-11-03 03:28:43,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424646624] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:28:43,198 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:28:43,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:28:43,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156890076] [2022-11-03 03:28:43,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:28:43,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:28:43,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:28:43,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:28:43,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:43,202 INFO L87 Difference]: Start difference. First operand 346 states and 478 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 03:28:43,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:28:43,388 INFO L93 Difference]: Finished difference Result 595 states and 802 transitions. [2022-11-03 03:28:43,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:28:43,389 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2022-11-03 03:28:43,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:28:43,392 INFO L225 Difference]: With dead ends: 595 [2022-11-03 03:28:43,393 INFO L226 Difference]: Without dead ends: 392 [2022-11-03 03:28:43,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:28:43,395 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 220 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:28:43,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 268 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:28:43,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2022-11-03 03:28:43,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 392. [2022-11-03 03:28:43,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 320 states have (on average 1.365625) internal successors, (437), 326 states have internal predecessors, (437), 48 states have call successors, (48), 24 states have call predecessors, (48), 22 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2022-11-03 03:28:43,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 529 transitions. [2022-11-03 03:28:43,438 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 529 transitions. Word has length 46 [2022-11-03 03:28:43,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:28:43,438 INFO L495 AbstractCegarLoop]: Abstraction has 392 states and 529 transitions. [2022-11-03 03:28:43,439 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 03:28:43,439 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 529 transitions. [2022-11-03 03:28:43,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-03 03:28:43,441 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:28:43,441 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:28:43,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-03 03:28:43,442 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:28:43,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:28:43,443 INFO L85 PathProgramCache]: Analyzing trace with hash 1000749722, now seen corresponding path program 1 times [2022-11-03 03:28:43,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:28:43,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643250830] [2022-11-03 03:28:43,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:28:43,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:28:43,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:28:43,625 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 03:28:43,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:28:43,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643250830] [2022-11-03 03:28:43,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643250830] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:28:43,626 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:28:43,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 03:28:43,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396210645] [2022-11-03 03:28:43,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:28:43,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:28:43,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:28:43,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:28:43,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:28:43,629 INFO L87 Difference]: Start difference. First operand 392 states and 529 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 03:28:43,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:28:43,953 INFO L93 Difference]: Finished difference Result 432 states and 576 transitions. [2022-11-03 03:28:43,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:28:43,954 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2022-11-03 03:28:43,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:28:43,958 INFO L225 Difference]: With dead ends: 432 [2022-11-03 03:28:43,958 INFO L226 Difference]: Without dead ends: 429 [2022-11-03 03:28:43,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:28:43,960 INFO L413 NwaCegarLoop]: 225 mSDtfsCounter, 404 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:28:43,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [404 Valid, 266 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:28:43,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 429 states. [2022-11-03 03:28:44,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 429 to 391. [2022-11-03 03:28:44,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 320 states have (on average 1.359375) internal successors, (435), 325 states have internal predecessors, (435), 47 states have call successors, (47), 24 states have call predecessors, (47), 22 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2022-11-03 03:28:44,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 526 transitions. [2022-11-03 03:28:44,011 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 526 transitions. Word has length 47 [2022-11-03 03:28:44,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:28:44,012 INFO L495 AbstractCegarLoop]: Abstraction has 391 states and 526 transitions. [2022-11-03 03:28:44,012 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 03:28:44,012 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 526 transitions. [2022-11-03 03:28:44,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-03 03:28:44,014 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:28:44,014 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:28:44,014 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-03 03:28:44,015 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:28:44,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:28:44,016 INFO L85 PathProgramCache]: Analyzing trace with hash 957489648, now seen corresponding path program 1 times [2022-11-03 03:28:44,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:28:44,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680584488] [2022-11-03 03:28:44,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:28:44,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:28:44,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:28:44,287 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 03:28:44,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:28:44,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680584488] [2022-11-03 03:28:44,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680584488] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:28:44,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610291901] [2022-11-03 03:28:44,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:28:44,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:28:44,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:28:44,294 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:28:44,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 03:28:44,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:28:44,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:28:44,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:28:44,905 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:28:44,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:28:45,137 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 03:28:45,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610291901] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:28:45,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1294558679] [2022-11-03 03:28:45,172 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2022-11-03 03:28:45,173 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:28:45,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:28:45,187 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:28:45,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:28:50,127 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 125 for LOIs [2022-11-03 03:28:50,163 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 140 for LOIs [2022-11-03 03:28:50,207 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 296 for LOIs [2022-11-03 03:28:52,746 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:29:21,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7374#(and (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t1_pc~0 0) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t2_i~0 0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~t1_st~0 0) (= ~c_num_read~0 1) (<= ~p_num_write~0 1) (= ~m_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= 0 (+ ~q_buf_0~0 2147483648)) (= ~p_dw_pc~0 1) (= ~q_write_ev~0 2) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (<= ~p_last_write~0 2147483647) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= 0 ~t4_pc~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2022-11-03 03:29:21,945 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:29:21,945 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:29:21,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2022-11-03 03:29:21,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571598441] [2022-11-03 03:29:21,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:29:21,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:29:21,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:21,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:29:21,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 03:29:21,949 INFO L87 Difference]: Start difference. First operand 391 states and 526 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-03 03:29:22,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:22,483 INFO L93 Difference]: Finished difference Result 834 states and 1094 transitions. [2022-11-03 03:29:22,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:29:22,489 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2022-11-03 03:29:22,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:22,498 INFO L225 Difference]: With dead ends: 834 [2022-11-03 03:29:22,498 INFO L226 Difference]: Without dead ends: 831 [2022-11-03 03:29:22,499 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 29.2s TimeCoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 03:29:22,504 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 356 mSDsluCounter, 908 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 1041 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:22,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 1041 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:29:22,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 831 states. [2022-11-03 03:29:22,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 831 to 600. [2022-11-03 03:29:22,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 497 states have (on average 1.3440643863179074) internal successors, (668), 504 states have internal predecessors, (668), 66 states have call successors, (66), 37 states have call predecessors, (66), 35 states have return successors, (63), 59 states have call predecessors, (63), 63 states have call successors, (63) [2022-11-03 03:29:22,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 797 transitions. [2022-11-03 03:29:22,598 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 797 transitions. Word has length 48 [2022-11-03 03:29:22,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:22,598 INFO L495 AbstractCegarLoop]: Abstraction has 600 states and 797 transitions. [2022-11-03 03:29:22,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-03 03:29:22,599 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 797 transitions. [2022-11-03 03:29:22,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-03 03:29:22,600 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:22,601 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:22,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 03:29:22,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:22,824 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:22,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:22,825 INFO L85 PathProgramCache]: Analyzing trace with hash 1290668848, now seen corresponding path program 1 times [2022-11-03 03:29:22,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:22,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883135324] [2022-11-03 03:29:22,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:22,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:22,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:22,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:29:22,956 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:22,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883135324] [2022-11-03 03:29:22,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883135324] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:22,957 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:29:22,957 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 03:29:22,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381399805] [2022-11-03 03:29:22,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:22,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:29:22,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:22,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:29:22,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:29:22,961 INFO L87 Difference]: Start difference. First operand 600 states and 797 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 03:29:23,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:23,353 INFO L93 Difference]: Finished difference Result 828 states and 1156 transitions. [2022-11-03 03:29:23,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:29:23,354 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 50 [2022-11-03 03:29:23,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:23,358 INFO L225 Difference]: With dead ends: 828 [2022-11-03 03:29:23,359 INFO L226 Difference]: Without dead ends: 708 [2022-11-03 03:29:23,360 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:29:23,361 INFO L413 NwaCegarLoop]: 336 mSDtfsCounter, 378 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 587 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:23,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [378 Valid, 587 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:29:23,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2022-11-03 03:29:23,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 707. [2022-11-03 03:29:23,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 707 states, 582 states have (on average 1.3573883161512028) internal successors, (790), 590 states have internal predecessors, (790), 82 states have call successors, (82), 43 states have call predecessors, (82), 41 states have return successors, (79), 74 states have call predecessors, (79), 79 states have call successors, (79) [2022-11-03 03:29:23,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 707 states to 707 states and 951 transitions. [2022-11-03 03:29:23,438 INFO L78 Accepts]: Start accepts. Automaton has 707 states and 951 transitions. Word has length 50 [2022-11-03 03:29:23,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:23,439 INFO L495 AbstractCegarLoop]: Abstraction has 707 states and 951 transitions. [2022-11-03 03:29:23,439 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 03:29:23,440 INFO L276 IsEmpty]: Start isEmpty. Operand 707 states and 951 transitions. [2022-11-03 03:29:23,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-03 03:29:23,442 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:23,442 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:23,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-03 03:29:23,443 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:23,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:23,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1206678856, now seen corresponding path program 2 times [2022-11-03 03:29:23,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:23,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269506017] [2022-11-03 03:29:23,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:23,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:23,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:23,489 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:29:23,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:23,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269506017] [2022-11-03 03:29:23,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1269506017] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:23,490 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:29:23,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:29:23,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886295936] [2022-11-03 03:29:23,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:23,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:23,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:23,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:23,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:23,492 INFO L87 Difference]: Start difference. First operand 707 states and 951 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 03:29:23,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:23,641 INFO L93 Difference]: Finished difference Result 1037 states and 1384 transitions. [2022-11-03 03:29:23,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:23,642 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 61 [2022-11-03 03:29:23,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:23,647 INFO L225 Difference]: With dead ends: 1037 [2022-11-03 03:29:23,647 INFO L226 Difference]: Without dead ends: 649 [2022-11-03 03:29:23,648 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:23,649 INFO L413 NwaCegarLoop]: 235 mSDtfsCounter, 232 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 280 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 [2022-11-03 03:29:23,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 280 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:23,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 649 states. [2022-11-03 03:29:23,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 649 to 640. [2022-11-03 03:29:23,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 525 states have (on average 1.3504761904761904) internal successors, (709), 534 states have internal predecessors, (709), 76 states have call successors, (76), 39 states have call predecessors, (76), 37 states have return successors, (73), 67 states have call predecessors, (73), 73 states have call successors, (73) [2022-11-03 03:29:23,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 858 transitions. [2022-11-03 03:29:23,719 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 858 transitions. Word has length 61 [2022-11-03 03:29:23,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:23,720 INFO L495 AbstractCegarLoop]: Abstraction has 640 states and 858 transitions. [2022-11-03 03:29:23,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 03:29:23,720 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 858 transitions. [2022-11-03 03:29:23,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-03 03:29:23,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:23,723 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:23,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-03 03:29:23,723 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:23,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:23,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1695452793, now seen corresponding path program 1 times [2022-11-03 03:29:23,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:23,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857491012] [2022-11-03 03:29:23,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:23,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:23,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:23,902 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:29:23,902 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:23,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857491012] [2022-11-03 03:29:23,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857491012] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:29:23,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72598329] [2022-11-03 03:29:23,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:23,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:23,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:29:23,905 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:29:23,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 03:29:24,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:24,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:29:24,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:29:24,141 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 03:29:24,142 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:29:24,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72598329] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:24,142 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:29:24,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 03:29:24,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309653875] [2022-11-03 03:29:24,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:24,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:24,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:24,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:24,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:29:24,144 INFO L87 Difference]: Start difference. First operand 640 states and 858 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-03 03:29:24,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:24,374 INFO L93 Difference]: Finished difference Result 767 states and 1017 transitions. [2022-11-03 03:29:24,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:24,375 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2022-11-03 03:29:24,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:24,377 INFO L225 Difference]: With dead ends: 767 [2022-11-03 03:29:24,377 INFO L226 Difference]: Without dead ends: 233 [2022-11-03 03:29:24,378 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:29:24,379 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 25 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:24,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 426 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:29:24,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2022-11-03 03:29:24,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 233. [2022-11-03 03:29:24,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 182 states have (on average 1.467032967032967) internal successors, (267), 185 states have internal predecessors, (267), 38 states have call successors, (38), 13 states have call predecessors, (38), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2022-11-03 03:29:24,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 341 transitions. [2022-11-03 03:29:24,407 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 341 transitions. Word has length 73 [2022-11-03 03:29:24,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:24,407 INFO L495 AbstractCegarLoop]: Abstraction has 233 states and 341 transitions. [2022-11-03 03:29:24,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-03 03:29:24,408 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 341 transitions. [2022-11-03 03:29:24,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-03 03:29:24,409 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:24,410 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:24,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 03:29:24,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 03:29:24,627 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:24,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:24,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1440814551, now seen corresponding path program 1 times [2022-11-03 03:29:24,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:24,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607894674] [2022-11-03 03:29:24,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:24,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:24,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:24,835 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 03:29:24,835 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:24,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607894674] [2022-11-03 03:29:24,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607894674] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:29:24,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426474616] [2022-11-03 03:29:24,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:24,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:24,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:29:24,851 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:29:24,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 03:29:25,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:25,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:29:25,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:29:25,139 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:29:25,140 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:29:25,140 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426474616] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:25,140 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:29:25,140 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 03:29:25,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775325637] [2022-11-03 03:29:25,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:25,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:25,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:25,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:25,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:29:25,143 INFO L87 Difference]: Start difference. First operand 233 states and 341 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 03:29:25,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:25,308 INFO L93 Difference]: Finished difference Result 680 states and 1012 transitions. [2022-11-03 03:29:25,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:25,309 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2022-11-03 03:29:25,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:25,314 INFO L225 Difference]: With dead ends: 680 [2022-11-03 03:29:25,315 INFO L226 Difference]: Without dead ends: 453 [2022-11-03 03:29:25,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:29:25,317 INFO L413 NwaCegarLoop]: 200 mSDtfsCounter, 152 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:25,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 342 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:25,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2022-11-03 03:29:25,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 447. [2022-11-03 03:29:25,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 354 states have (on average 1.463276836158192) internal successors, (518), 358 states have internal predecessors, (518), 68 states have call successors, (68), 25 states have call predecessors, (68), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2022-11-03 03:29:25,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 652 transitions. [2022-11-03 03:29:25,367 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 652 transitions. Word has length 95 [2022-11-03 03:29:25,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:25,367 INFO L495 AbstractCegarLoop]: Abstraction has 447 states and 652 transitions. [2022-11-03 03:29:25,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 03:29:25,368 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 652 transitions. [2022-11-03 03:29:25,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-03 03:29:25,377 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:25,378 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:25,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 03:29:25,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:25,593 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:25,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:25,593 INFO L85 PathProgramCache]: Analyzing trace with hash -1773668105, now seen corresponding path program 1 times [2022-11-03 03:29:25,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:25,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967282008] [2022-11-03 03:29:25,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:25,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:25,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:25,741 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 03:29:25,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:25,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967282008] [2022-11-03 03:29:25,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967282008] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:29:25,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593308453] [2022-11-03 03:29:25,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:25,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:25,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:29:25,746 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:29:25,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 03:29:25,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:25,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:29:25,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:29:26,027 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-03 03:29:26,027 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:29:26,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593308453] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:26,028 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:29:26,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 03:29:26,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493569188] [2022-11-03 03:29:26,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:26,032 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:26,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:26,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:26,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:29:26,034 INFO L87 Difference]: Start difference. First operand 447 states and 652 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 03:29:26,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:26,225 INFO L93 Difference]: Finished difference Result 1316 states and 1951 transitions. [2022-11-03 03:29:26,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:26,226 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2022-11-03 03:29:26,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:26,232 INFO L225 Difference]: With dead ends: 1316 [2022-11-03 03:29:26,232 INFO L226 Difference]: Without dead ends: 875 [2022-11-03 03:29:26,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:29:26,238 INFO L413 NwaCegarLoop]: 199 mSDtfsCounter, 155 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:26,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 341 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:26,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2022-11-03 03:29:26,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 867. [2022-11-03 03:29:26,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 867 states, 692 states have (on average 1.4566473988439306) internal successors, (1008), 698 states have internal predecessors, (1008), 126 states have call successors, (126), 49 states have call predecessors, (126), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2022-11-03 03:29:26,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1258 transitions. [2022-11-03 03:29:26,361 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1258 transitions. Word has length 95 [2022-11-03 03:29:26,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:26,361 INFO L495 AbstractCegarLoop]: Abstraction has 867 states and 1258 transitions. [2022-11-03 03:29:26,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 03:29:26,362 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1258 transitions. [2022-11-03 03:29:26,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-03 03:29:26,368 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:26,368 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:26,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 03:29:26,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:26,583 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:26,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:26,584 INFO L85 PathProgramCache]: Analyzing trace with hash 459325911, now seen corresponding path program 1 times [2022-11-03 03:29:26,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:26,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558190264] [2022-11-03 03:29:26,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:26,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:26,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:26,746 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 03:29:26,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:26,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558190264] [2022-11-03 03:29:26,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558190264] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:29:26,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6272287] [2022-11-03 03:29:26,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:26,747 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:26,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:29:26,749 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:29:26,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 03:29:26,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:26,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:29:26,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:29:27,020 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 03:29:27,020 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:29:27,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6272287] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:27,020 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:29:27,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 03:29:27,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828999046] [2022-11-03 03:29:27,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:27,022 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:27,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:27,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:27,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:29:27,023 INFO L87 Difference]: Start difference. First operand 867 states and 1258 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 03:29:27,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:27,310 INFO L93 Difference]: Finished difference Result 2564 states and 3779 transitions. [2022-11-03 03:29:27,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:27,311 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2022-11-03 03:29:27,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:27,322 INFO L225 Difference]: With dead ends: 2564 [2022-11-03 03:29:27,322 INFO L226 Difference]: Without dead ends: 1703 [2022-11-03 03:29:27,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:29:27,328 INFO L413 NwaCegarLoop]: 198 mSDtfsCounter, 161 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:27,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 340 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:27,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1703 states. [2022-11-03 03:29:27,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1703 to 1691. [2022-11-03 03:29:27,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1691 states, 1356 states have (on average 1.448377581120944) internal successors, (1964), 1366 states have internal predecessors, (1964), 238 states have call successors, (238), 97 states have call predecessors, (238), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2022-11-03 03:29:27,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1691 states to 1691 states and 2438 transitions. [2022-11-03 03:29:27,539 INFO L78 Accepts]: Start accepts. Automaton has 1691 states and 2438 transitions. Word has length 95 [2022-11-03 03:29:27,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:27,539 INFO L495 AbstractCegarLoop]: Abstraction has 1691 states and 2438 transitions. [2022-11-03 03:29:27,540 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 03:29:27,540 INFO L276 IsEmpty]: Start isEmpty. Operand 1691 states and 2438 transitions. [2022-11-03 03:29:27,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-03 03:29:27,544 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:27,545 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:27,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 03:29:27,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 03:29:27,762 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:27,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:27,762 INFO L85 PathProgramCache]: Analyzing trace with hash -1774755145, now seen corresponding path program 1 times [2022-11-03 03:29:27,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:27,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742705118] [2022-11-03 03:29:27,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:27,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:27,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:27,896 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:29:27,897 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:27,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742705118] [2022-11-03 03:29:27,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [742705118] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:27,897 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:29:27,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:29:27,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780261231] [2022-11-03 03:29:27,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:27,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:27,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:27,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:27,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:27,900 INFO L87 Difference]: Start difference. First operand 1691 states and 2438 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 03:29:28,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:28,207 INFO L93 Difference]: Finished difference Result 3007 states and 4401 transitions. [2022-11-03 03:29:28,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:28,208 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 95 [2022-11-03 03:29:28,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:28,222 INFO L225 Difference]: With dead ends: 3007 [2022-11-03 03:29:28,223 INFO L226 Difference]: Without dead ends: 2131 [2022-11-03 03:29:28,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:28,228 INFO L413 NwaCegarLoop]: 228 mSDtfsCounter, 73 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 386 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:28,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 386 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:28,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2131 states. [2022-11-03 03:29:28,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2131 to 1975. [2022-11-03 03:29:28,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1975 states, 1624 states have (on average 1.4901477832512315) internal successors, (2420), 1634 states have internal predecessors, (2420), 246 states have call successors, (246), 105 states have call predecessors, (246), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2022-11-03 03:29:28,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1975 states to 1975 states and 2910 transitions. [2022-11-03 03:29:28,488 INFO L78 Accepts]: Start accepts. Automaton has 1975 states and 2910 transitions. Word has length 95 [2022-11-03 03:29:28,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:28,489 INFO L495 AbstractCegarLoop]: Abstraction has 1975 states and 2910 transitions. [2022-11-03 03:29:28,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 03:29:28,490 INFO L276 IsEmpty]: Start isEmpty. Operand 1975 states and 2910 transitions. [2022-11-03 03:29:28,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-03 03:29:28,497 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:28,498 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:28,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-03 03:29:28,498 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:28,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:28,499 INFO L85 PathProgramCache]: Analyzing trace with hash -629173050, now seen corresponding path program 1 times [2022-11-03 03:29:28,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:28,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574045564] [2022-11-03 03:29:28,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:28,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:28,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:28,616 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-11-03 03:29:28,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:28,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574045564] [2022-11-03 03:29:28,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574045564] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:28,617 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:29:28,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:29:28,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561803558] [2022-11-03 03:29:28,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:28,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:28,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:28,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:28,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:28,619 INFO L87 Difference]: Start difference. First operand 1975 states and 2910 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 03:29:29,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:29,143 INFO L93 Difference]: Finished difference Result 5840 states and 8703 transitions. [2022-11-03 03:29:29,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:29,144 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2022-11-03 03:29:29,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:29,168 INFO L225 Difference]: With dead ends: 5840 [2022-11-03 03:29:29,168 INFO L226 Difference]: Without dead ends: 3871 [2022-11-03 03:29:29,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:29,180 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 150 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:29,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 310 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:29,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3871 states. [2022-11-03 03:29:29,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3871 to 3843. [2022-11-03 03:29:29,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3843 states, 3164 states have (on average 1.4778761061946903) internal successors, (4676), 3182 states have internal predecessors, (4676), 470 states have call successors, (470), 209 states have call predecessors, (470), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2022-11-03 03:29:29,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3843 states to 3843 states and 5614 transitions. [2022-11-03 03:29:29,649 INFO L78 Accepts]: Start accepts. Automaton has 3843 states and 5614 transitions. Word has length 127 [2022-11-03 03:29:29,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:29,650 INFO L495 AbstractCegarLoop]: Abstraction has 3843 states and 5614 transitions. [2022-11-03 03:29:29,650 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 03:29:29,650 INFO L276 IsEmpty]: Start isEmpty. Operand 3843 states and 5614 transitions. [2022-11-03 03:29:29,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-03 03:29:29,663 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:29,664 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:29,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-03 03:29:29,664 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:29,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:29,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1407102595, now seen corresponding path program 1 times [2022-11-03 03:29:29,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:29,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583969141] [2022-11-03 03:29:29,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:29,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:29,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:29,791 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-11-03 03:29:29,791 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:29,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583969141] [2022-11-03 03:29:29,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583969141] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:29,792 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:29:29,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:29:29,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622075455] [2022-11-03 03:29:29,793 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:29,793 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:29,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:29,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:29,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:29,795 INFO L87 Difference]: Start difference. First operand 3843 states and 5614 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 03:29:30,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:30,792 INFO L93 Difference]: Finished difference Result 11372 states and 16791 transitions. [2022-11-03 03:29:30,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:30,793 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2022-11-03 03:29:30,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:30,841 INFO L225 Difference]: With dead ends: 11372 [2022-11-03 03:29:30,842 INFO L226 Difference]: Without dead ends: 7535 [2022-11-03 03:29:30,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:30,858 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 153 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:30,858 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 310 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:30,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7535 states. [2022-11-03 03:29:31,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7535 to 7483. [2022-11-03 03:29:31,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7483 states, 6164 states have (on average 1.464633354964309) internal successors, (9028), 6198 states have internal predecessors, (9028), 902 states have call successors, (902), 417 states have call predecessors, (902), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2022-11-03 03:29:31,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7483 states to 7483 states and 10830 transitions. [2022-11-03 03:29:31,838 INFO L78 Accepts]: Start accepts. Automaton has 7483 states and 10830 transitions. Word has length 127 [2022-11-03 03:29:31,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:31,838 INFO L495 AbstractCegarLoop]: Abstraction has 7483 states and 10830 transitions. [2022-11-03 03:29:31,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 03:29:31,840 INFO L276 IsEmpty]: Start isEmpty. Operand 7483 states and 10830 transitions. [2022-11-03 03:29:31,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-03 03:29:31,867 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:31,867 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:31,868 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-11-03 03:29:31,868 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:31,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:31,869 INFO L85 PathProgramCache]: Analyzing trace with hash -772464092, now seen corresponding path program 1 times [2022-11-03 03:29:31,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:31,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599761650] [2022-11-03 03:29:31,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:31,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:31,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:31,991 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-11-03 03:29:31,992 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:31,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599761650] [2022-11-03 03:29:31,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599761650] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:31,992 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:29:31,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:29:31,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335348932] [2022-11-03 03:29:31,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:31,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:31,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:31,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:31,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:31,995 INFO L87 Difference]: Start difference. First operand 7483 states and 10830 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 03:29:33,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:33,940 INFO L93 Difference]: Finished difference Result 22148 states and 32375 transitions. [2022-11-03 03:29:33,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:33,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2022-11-03 03:29:33,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:34,018 INFO L225 Difference]: With dead ends: 22148 [2022-11-03 03:29:34,018 INFO L226 Difference]: Without dead ends: 14671 [2022-11-03 03:29:34,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:29:34,048 INFO L413 NwaCegarLoop]: 189 mSDtfsCounter, 155 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:34,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 331 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:34,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14671 states. [2022-11-03 03:29:35,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14671 to 14571. [2022-11-03 03:29:35,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14571 states, 12004 states have (on average 1.4505164945018327) internal successors, (17412), 12070 states have internal predecessors, (17412), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2022-11-03 03:29:35,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14571 states to 14571 states and 20878 transitions. [2022-11-03 03:29:35,936 INFO L78 Accepts]: Start accepts. Automaton has 14571 states and 20878 transitions. Word has length 127 [2022-11-03 03:29:35,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:35,937 INFO L495 AbstractCegarLoop]: Abstraction has 14571 states and 20878 transitions. [2022-11-03 03:29:35,937 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 03:29:35,938 INFO L276 IsEmpty]: Start isEmpty. Operand 14571 states and 20878 transitions. [2022-11-03 03:29:35,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-11-03 03:29:35,998 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:35,999 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:35,999 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-03 03:29:35,999 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:36,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:36,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1858098539, now seen corresponding path program 1 times [2022-11-03 03:29:36,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:36,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402714942] [2022-11-03 03:29:36,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:36,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:36,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:36,478 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-03 03:29:36,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:36,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402714942] [2022-11-03 03:29:36,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402714942] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:29:36,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500521635] [2022-11-03 03:29:36,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:36,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:36,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:29:36,483 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:29:36,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 03:29:36,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:36,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:29:36,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:29:36,802 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-03 03:29:36,803 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:29:36,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500521635] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:36,803 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:29:36,803 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:29:36,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274798903] [2022-11-03 03:29:36,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:36,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:36,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:36,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:36,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:29:36,806 INFO L87 Difference]: Start difference. First operand 14571 states and 20878 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 03:29:38,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:38,600 INFO L93 Difference]: Finished difference Result 22115 states and 32244 transitions. [2022-11-03 03:29:38,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:38,601 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 146 [2022-11-03 03:29:38,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:38,669 INFO L225 Difference]: With dead ends: 22115 [2022-11-03 03:29:38,669 INFO L226 Difference]: Without dead ends: 14639 [2022-11-03 03:29:38,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:29:38,701 INFO L413 NwaCegarLoop]: 268 mSDtfsCounter, 147 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:38,701 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 413 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:29:38,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14639 states. [2022-11-03 03:29:40,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14639 to 14507. [2022-11-03 03:29:40,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14507 states, 11940 states have (on average 1.4314907872696818) internal successors, (17092), 12006 states have internal predecessors, (17092), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2022-11-03 03:29:40,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14507 states to 14507 states and 20558 transitions. [2022-11-03 03:29:40,697 INFO L78 Accepts]: Start accepts. Automaton has 14507 states and 20558 transitions. Word has length 146 [2022-11-03 03:29:40,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:40,699 INFO L495 AbstractCegarLoop]: Abstraction has 14507 states and 20558 transitions. [2022-11-03 03:29:40,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 03:29:40,699 INFO L276 IsEmpty]: Start isEmpty. Operand 14507 states and 20558 transitions. [2022-11-03 03:29:40,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-11-03 03:29:40,764 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:40,764 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:40,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 03:29:40,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 03:29:40,979 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:40,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:40,979 INFO L85 PathProgramCache]: Analyzing trace with hash -1760401513, now seen corresponding path program 1 times [2022-11-03 03:29:40,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:40,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960686174] [2022-11-03 03:29:40,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:40,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:41,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:41,380 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 12 proven. 43 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-03 03:29:41,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:41,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960686174] [2022-11-03 03:29:41,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960686174] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:29:41,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087966903] [2022-11-03 03:29:41,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:41,382 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:41,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:29:41,383 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:29:41,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 03:29:41,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:41,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 832 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:29:41,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:29:41,694 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-03 03:29:41,694 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:29:41,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087966903] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:41,695 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:29:41,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:29:41,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97431150] [2022-11-03 03:29:41,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:41,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:41,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:41,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:41,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:29:41,698 INFO L87 Difference]: Start difference. First operand 14507 states and 20558 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 03:29:43,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:43,605 INFO L93 Difference]: Finished difference Result 25657 states and 35851 transitions. [2022-11-03 03:29:43,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:43,606 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 146 [2022-11-03 03:29:43,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:43,688 INFO L225 Difference]: With dead ends: 25657 [2022-11-03 03:29:43,689 INFO L226 Difference]: Without dead ends: 18277 [2022-11-03 03:29:43,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:29:43,724 INFO L413 NwaCegarLoop]: 173 mSDtfsCounter, 159 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:43,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 212 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:43,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18277 states. [2022-11-03 03:29:46,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18277 to 18277. [2022-11-03 03:29:46,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18277 states, 15330 states have (on average 1.381996086105675) internal successors, (21186), 15396 states have internal predecessors, (21186), 1860 states have call successors, (1860), 1087 states have call predecessors, (1860), 1086 states have return successors, (1858), 1794 states have call predecessors, (1858), 1858 states have call successors, (1858) [2022-11-03 03:29:46,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18277 states to 18277 states and 24904 transitions. [2022-11-03 03:29:46,394 INFO L78 Accepts]: Start accepts. Automaton has 18277 states and 24904 transitions. Word has length 146 [2022-11-03 03:29:46,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:46,395 INFO L495 AbstractCegarLoop]: Abstraction has 18277 states and 24904 transitions. [2022-11-03 03:29:46,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 03:29:46,395 INFO L276 IsEmpty]: Start isEmpty. Operand 18277 states and 24904 transitions. [2022-11-03 03:29:46,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-11-03 03:29:46,444 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:46,444 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:46,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 03:29:46,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:46,657 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:46,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:46,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1940893130, now seen corresponding path program 1 times [2022-11-03 03:29:46,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:46,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108579641] [2022-11-03 03:29:46,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:46,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:46,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:47,102 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 12 proven. 44 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-03 03:29:47,103 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:47,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108579641] [2022-11-03 03:29:47,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108579641] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:29:47,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423499034] [2022-11-03 03:29:47,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:47,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:47,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:29:47,105 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:29:47,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 03:29:47,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:47,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 831 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:29:47,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:29:47,447 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 96 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 03:29:47,448 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:29:47,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423499034] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:47,448 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:29:47,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:29:47,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327726114] [2022-11-03 03:29:47,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:47,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:29:47,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:47,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:29:47,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:29:47,451 INFO L87 Difference]: Start difference. First operand 18277 states and 24904 transitions. Second operand has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 03:29:50,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:50,158 INFO L93 Difference]: Finished difference Result 27709 states and 38446 transitions. [2022-11-03 03:29:50,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:29:50,158 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 147 [2022-11-03 03:29:50,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:50,246 INFO L225 Difference]: With dead ends: 27709 [2022-11-03 03:29:50,246 INFO L226 Difference]: Without dead ends: 18345 [2022-11-03 03:29:50,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:29:50,279 INFO L413 NwaCegarLoop]: 275 mSDtfsCounter, 139 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 419 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:50,280 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 419 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:50,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18345 states. [2022-11-03 03:29:52,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18345 to 18213. [2022-11-03 03:29:52,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18213 states, 15266 states have (on average 1.3626359229660683) internal successors, (20802), 15332 states have internal predecessors, (20802), 1860 states have call successors, (1860), 1087 states have call predecessors, (1860), 1086 states have return successors, (1858), 1794 states have call predecessors, (1858), 1858 states have call successors, (1858) [2022-11-03 03:29:52,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18213 states to 18213 states and 24520 transitions. [2022-11-03 03:29:52,123 INFO L78 Accepts]: Start accepts. Automaton has 18213 states and 24520 transitions. Word has length 147 [2022-11-03 03:29:52,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:29:52,124 INFO L495 AbstractCegarLoop]: Abstraction has 18213 states and 24520 transitions. [2022-11-03 03:29:52,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 03:29:52,124 INFO L276 IsEmpty]: Start isEmpty. Operand 18213 states and 24520 transitions. [2022-11-03 03:29:52,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-11-03 03:29:52,169 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:29:52,170 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:29:52,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 03:29:52,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:52,386 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:29:52,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:29:52,387 INFO L85 PathProgramCache]: Analyzing trace with hash 525898986, now seen corresponding path program 1 times [2022-11-03 03:29:52,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:29:52,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967664495] [2022-11-03 03:29:52,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:52,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:29:52,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:52,754 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-03 03:29:52,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:29:52,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967664495] [2022-11-03 03:29:52,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967664495] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:29:52,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967303000] [2022-11-03 03:29:52,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:29:52,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:29:52,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:29:52,757 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:29:52,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 03:29:53,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:29:53,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 837 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 03:29:53,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:29:53,084 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:29:53,084 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:29:53,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967303000] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:29:53,085 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:29:53,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2022-11-03 03:29:53,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183182111] [2022-11-03 03:29:53,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:29:53,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:29:53,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:29:53,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:29:53,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-03 03:29:53,087 INFO L87 Difference]: Start difference. First operand 18213 states and 24520 transitions. Second operand has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 03:29:56,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:29:56,747 INFO L93 Difference]: Finished difference Result 55291 states and 74364 transitions. [2022-11-03 03:29:56,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:29:56,748 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 147 [2022-11-03 03:29:56,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:29:56,893 INFO L225 Difference]: With dead ends: 55291 [2022-11-03 03:29:56,894 INFO L226 Difference]: Without dead ends: 37085 [2022-11-03 03:29:56,935 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-11-03 03:29:56,936 INFO L413 NwaCegarLoop]: 314 mSDtfsCounter, 176 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 746 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:29:56,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 746 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:29:56,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37085 states. [2022-11-03 03:30:00,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37085 to 37017. [2022-11-03 03:30:00,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37017 states, 31134 states have (on average 1.35254063082161) internal successors, (42110), 31328 states have internal predecessors, (42110), 3648 states have call successors, (3648), 2171 states have call predecessors, (3648), 2234 states have return successors, (3838), 3518 states have call predecessors, (3838), 3646 states have call successors, (3838) [2022-11-03 03:30:00,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37017 states to 37017 states and 49596 transitions. [2022-11-03 03:30:00,702 INFO L78 Accepts]: Start accepts. Automaton has 37017 states and 49596 transitions. Word has length 147 [2022-11-03 03:30:00,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:30:00,703 INFO L495 AbstractCegarLoop]: Abstraction has 37017 states and 49596 transitions. [2022-11-03 03:30:00,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 03:30:00,703 INFO L276 IsEmpty]: Start isEmpty. Operand 37017 states and 49596 transitions. [2022-11-03 03:30:00,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-11-03 03:30:00,813 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:30:00,814 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:30:00,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 03:30:01,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:30:01,042 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:30:01,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:30:01,043 INFO L85 PathProgramCache]: Analyzing trace with hash 1446096569, now seen corresponding path program 1 times [2022-11-03 03:30:01,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:30:01,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797968653] [2022-11-03 03:30:01,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:30:01,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:30:01,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:30:01,746 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 11 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-03 03:30:01,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:30:01,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797968653] [2022-11-03 03:30:01,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797968653] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:30:01,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258442009] [2022-11-03 03:30:01,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:30:01,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:30:01,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:30:01,750 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:30:01,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 03:30:02,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:30:02,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 834 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:30:02,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:30:02,077 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-03 03:30:02,077 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:30:02,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258442009] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:30:02,078 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:30:02,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:30:02,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013120300] [2022-11-03 03:30:02,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:30:02,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:30:02,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:30:02,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:30:02,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:30:02,082 INFO L87 Difference]: Start difference. First operand 37017 states and 49596 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 03:30:06,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:30:06,711 INFO L93 Difference]: Finished difference Result 86373 states and 117601 transitions. [2022-11-03 03:30:06,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:30:06,715 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 147 [2022-11-03 03:30:06,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:30:07,126 INFO L225 Difference]: With dead ends: 86373 [2022-11-03 03:30:07,126 INFO L226 Difference]: Without dead ends: 49363 [2022-11-03 03:30:07,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:30:07,206 INFO L413 NwaCegarLoop]: 177 mSDtfsCounter, 83 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:30:07,207 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 319 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:30:07,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49363 states. [2022-11-03 03:30:11,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49363 to 40805. [2022-11-03 03:30:11,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40805 states, 34660 states have (on average 1.3813040969417196) internal successors, (47876), 34856 states have internal predecessors, (47876), 3779 states have call successors, (3779), 2302 states have call predecessors, (3779), 2365 states have return successors, (3969), 3647 states have call predecessors, (3969), 3777 states have call successors, (3969) [2022-11-03 03:30:11,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40805 states to 40805 states and 55624 transitions. [2022-11-03 03:30:11,771 INFO L78 Accepts]: Start accepts. Automaton has 40805 states and 55624 transitions. Word has length 147 [2022-11-03 03:30:11,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:30:11,772 INFO L495 AbstractCegarLoop]: Abstraction has 40805 states and 55624 transitions. [2022-11-03 03:30:11,772 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 03:30:11,772 INFO L276 IsEmpty]: Start isEmpty. Operand 40805 states and 55624 transitions. [2022-11-03 03:30:11,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-11-03 03:30:11,890 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:30:11,890 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:30:11,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 03:30:12,106 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:30:12,107 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:30:12,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:30:12,107 INFO L85 PathProgramCache]: Analyzing trace with hash -1583295136, now seen corresponding path program 2 times [2022-11-03 03:30:12,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:30:12,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344889856] [2022-11-03 03:30:12,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:30:12,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:30:12,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:30:12,311 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2022-11-03 03:30:12,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:30:12,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344889856] [2022-11-03 03:30:12,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344889856] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:30:12,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222553554] [2022-11-03 03:30:12,313 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:30:12,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:30:12,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:30:12,314 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:30:12,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40cd5b83-7fd9-4cde-b390-7ce3ceeb7b26/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 03:30:12,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:30:12,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:30:12,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 831 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:30:12,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:30:12,622 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-03 03:30:12,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:30:12,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222553554] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:30:12,623 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:30:12,623 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 03:30:12,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886341557] [2022-11-03 03:30:12,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:30:12,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:30:12,625 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:30:12,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:30:12,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:30:12,626 INFO L87 Difference]: Start difference. First operand 40805 states and 55624 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11)