./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7 --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 065397af3cd6d10649fc8ba37687b2a2b7dcb462be78997de981751c3e212e90 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:55:45,099 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:55:45,102 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:55:45,134 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:55:45,135 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:55:45,136 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:55:45,138 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:55:45,141 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:55:45,143 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:55:45,144 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:55:45,146 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:55:45,147 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:55:45,148 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:55:45,149 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:55:45,158 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:55:45,160 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:55:45,161 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:55:45,162 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:55:45,164 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:55:45,168 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:55:45,170 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:55:45,172 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:55:45,173 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:55:45,174 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:55:45,178 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:55:45,179 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:55:45,179 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:55:45,181 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:55:45,181 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:55:45,183 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:55:45,190 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:55:45,191 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:55:45,192 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:55:45,193 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:55:45,195 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:55:45,195 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:55:45,196 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:55:45,196 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:55:45,197 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:55:45,198 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:55:45,199 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:55:45,208 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 17:55:45,248 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:55:45,249 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:55:45,250 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:55:45,250 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:55:45,251 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:55:45,251 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:55:45,251 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:55:45,251 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:55:45,251 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:55:45,251 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:55:45,252 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:55:45,253 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:55:45,253 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:55:45,253 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:55:45,253 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:55:45,253 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:55:45,254 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:55:45,254 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:55:45,254 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:55:45,255 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:55:45,255 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:55:45,255 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:55:45,255 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:55:45,255 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:55:45,255 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:55:45,256 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:55:45,257 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:55:45,257 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:55:45,257 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:55:45,258 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:55:45,258 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:55:45,258 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:55:45,258 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:55:45,259 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:55:45,259 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:55:45,259 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:55:45,259 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:55:45,259 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:55:45,259 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:55:45,260 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:55:45,260 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:55:45,260 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 065397af3cd6d10649fc8ba37687b2a2b7dcb462be78997de981751c3e212e90 [2021-11-25 17:55:45,514 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:55:45,541 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:55:45,544 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:55:45,546 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:55:45,546 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:55:45,548 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-25 17:55:45,622 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/data/30479053e/1ebd8d0da57047dd98289bef6d1fa420/FLAG7ddc8c344 [2021-11-25 17:55:46,100 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:55:46,101 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-25 17:55:46,127 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/data/30479053e/1ebd8d0da57047dd98289bef6d1fa420/FLAG7ddc8c344 [2021-11-25 17:55:46,472 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/data/30479053e/1ebd8d0da57047dd98289bef6d1fa420 [2021-11-25 17:55:46,474 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:55:46,476 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:55:46,477 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:55:46,477 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:55:46,495 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:55:46,496 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,497 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43271776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46, skipping insertion in model container [2021-11-25 17:55:46,497 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,504 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:55:46,548 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:55:46,740 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_cf29f631-7549-4b8f-af41-c40c8e7deb9b/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c[5339,5352] [2021-11-25 17:55:46,768 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:55:46,780 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:55:46,816 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_cf29f631-7549-4b8f-af41-c40c8e7deb9b/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c[5339,5352] [2021-11-25 17:55:46,837 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:55:46,855 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:55:46,856 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46 WrapperNode [2021-11-25 17:55:46,856 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:55:46,857 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:55:46,857 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:55:46,857 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:55:46,865 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,876 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,928 INFO L137 Inliner]: procedures = 23, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 427 [2021-11-25 17:55:46,928 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:55:46,929 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:55:46,929 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:55:46,929 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:55:46,943 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,944 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,955 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,956 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,963 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,984 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,986 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:46,989 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:55:46,990 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:55:46,990 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:55:46,991 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:55:47,006 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (1/1) ... [2021-11-25 17:55:47,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:55:47,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:47,043 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:55:47,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:55:47,094 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:55:47,094 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:55:47,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:55:47,095 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:55:47,220 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:55:47,221 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:55:47,685 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:55:47,815 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:55:47,817 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 17:55:47,820 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:55:47 BoogieIcfgContainer [2021-11-25 17:55:47,821 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:55:47,823 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:55:47,823 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:55:47,826 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:55:47,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:55:46" (1/3) ... [2021-11-25 17:55:47,828 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bb9dcd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:55:47, skipping insertion in model container [2021-11-25 17:55:47,828 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:55:46" (2/3) ... [2021-11-25 17:55:47,828 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bb9dcd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:55:47, skipping insertion in model container [2021-11-25 17:55:47,828 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:55:47" (3/3) ... [2021-11-25 17:55:47,830 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr-var-start-time.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-25 17:55:47,838 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:55:47,838 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:55:47,904 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:55:47,916 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 17:55:47,916 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:55:47,935 INFO L276 IsEmpty]: Start isEmpty. Operand has 84 states, 82 states have (on average 1.6829268292682926) internal successors, (138), 83 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:47,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 17:55:47,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:47,956 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:47,956 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:47,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:47,962 INFO L85 PathProgramCache]: Analyzing trace with hash 518869757, now seen corresponding path program 1 times [2021-11-25 17:55:47,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:47,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125606840] [2021-11-25 17:55:47,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:47,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:48,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:48,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:48,269 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:48,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125606840] [2021-11-25 17:55:48,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125606840] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:48,271 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:48,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:55:48,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275333476] [2021-11-25 17:55:48,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:48,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:55:48,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:48,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:55:48,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:48,316 INFO L87 Difference]: Start difference. First operand has 84 states, 82 states have (on average 1.6829268292682926) internal successors, (138), 83 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:48,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:48,462 INFO L93 Difference]: Finished difference Result 189 states and 295 transitions. [2021-11-25 17:55:48,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:55:48,466 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-25 17:55:48,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:48,479 INFO L225 Difference]: With dead ends: 189 [2021-11-25 17:55:48,479 INFO L226 Difference]: Without dead ends: 127 [2021-11-25 17:55:48,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:48,488 INFO L933 BasicCegarLoop]: 189 mSDtfsCounter, 102 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:48,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 261 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:48,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-25 17:55:48,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2021-11-25 17:55:48,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.4112903225806452) internal successors, (175), 124 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:48,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 175 transitions. [2021-11-25 17:55:48,572 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 175 transitions. Word has length 37 [2021-11-25 17:55:48,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:48,573 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 175 transitions. [2021-11-25 17:55:48,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:48,575 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 175 transitions. [2021-11-25 17:55:48,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 17:55:48,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:48,578 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:48,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:55:48,579 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:48,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:48,581 INFO L85 PathProgramCache]: Analyzing trace with hash 95084108, now seen corresponding path program 1 times [2021-11-25 17:55:48,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:48,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417597574] [2021-11-25 17:55:48,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:48,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:48,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:48,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:48,773 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:48,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417597574] [2021-11-25 17:55:48,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417597574] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:48,774 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:48,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:55:48,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490669843] [2021-11-25 17:55:48,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:48,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:55:48,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:48,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:55:48,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:48,780 INFO L87 Difference]: Start difference. First operand 125 states and 175 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:48,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:48,875 INFO L93 Difference]: Finished difference Result 301 states and 439 transitions. [2021-11-25 17:55:48,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:55:48,876 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 17:55:48,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:48,879 INFO L225 Difference]: With dead ends: 301 [2021-11-25 17:55:48,880 INFO L226 Difference]: Without dead ends: 202 [2021-11-25 17:55:48,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:48,885 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 76 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:48,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 214 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:48,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-25 17:55:48,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2021-11-25 17:55:48,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 199 states have (on average 1.4422110552763818) internal successors, (287), 199 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:48,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 287 transitions. [2021-11-25 17:55:48,934 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 287 transitions. Word has length 40 [2021-11-25 17:55:48,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:48,937 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 287 transitions. [2021-11-25 17:55:48,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:48,939 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 287 transitions. [2021-11-25 17:55:48,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 17:55:48,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:48,942 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:48,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 17:55:48,943 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:48,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:48,945 INFO L85 PathProgramCache]: Analyzing trace with hash -565123036, now seen corresponding path program 1 times [2021-11-25 17:55:48,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:48,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483654978] [2021-11-25 17:55:48,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:48,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:49,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:49,085 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:49,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:49,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483654978] [2021-11-25 17:55:49,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483654978] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:49,086 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:49,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:55:49,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680385525] [2021-11-25 17:55:49,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:49,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:55:49,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:49,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:55:49,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:49,088 INFO L87 Difference]: Start difference. First operand 200 states and 287 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:49,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:49,180 INFO L93 Difference]: Finished difference Result 504 states and 741 transitions. [2021-11-25 17:55:49,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:55:49,181 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-25 17:55:49,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:49,185 INFO L225 Difference]: With dead ends: 504 [2021-11-25 17:55:49,185 INFO L226 Difference]: Without dead ends: 330 [2021-11-25 17:55:49,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:49,188 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 71 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:49,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 199 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:49,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-11-25 17:55:49,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 328. [2021-11-25 17:55:49,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 1.452599388379205) internal successors, (475), 327 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:49,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 475 transitions. [2021-11-25 17:55:49,218 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 475 transitions. Word has length 43 [2021-11-25 17:55:49,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:49,219 INFO L470 AbstractCegarLoop]: Abstraction has 328 states and 475 transitions. [2021-11-25 17:55:49,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:49,219 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 475 transitions. [2021-11-25 17:55:49,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 17:55:49,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:49,221 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:49,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 17:55:49,221 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:49,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:49,222 INFO L85 PathProgramCache]: Analyzing trace with hash 172089258, now seen corresponding path program 1 times [2021-11-25 17:55:49,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:49,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011541238] [2021-11-25 17:55:49,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:49,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:49,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:49,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:49,320 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:49,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011541238] [2021-11-25 17:55:49,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011541238] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:49,320 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:49,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:55:49,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890630032] [2021-11-25 17:55:49,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:49,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:55:49,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:49,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:55:49,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:49,323 INFO L87 Difference]: Start difference. First operand 328 states and 475 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:49,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:49,385 INFO L93 Difference]: Finished difference Result 844 states and 1237 transitions. [2021-11-25 17:55:49,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:55:49,386 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 17:55:49,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:49,390 INFO L225 Difference]: With dead ends: 844 [2021-11-25 17:55:49,390 INFO L226 Difference]: Without dead ends: 542 [2021-11-25 17:55:49,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:55:49,393 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 66 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:49,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 184 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:55:49,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-11-25 17:55:49,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 540. [2021-11-25 17:55:49,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 540 states, 539 states have (on average 1.4452690166975881) internal successors, (779), 539 states have internal predecessors, (779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:49,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 779 transitions. [2021-11-25 17:55:49,458 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 779 transitions. Word has length 46 [2021-11-25 17:55:49,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:49,459 INFO L470 AbstractCegarLoop]: Abstraction has 540 states and 779 transitions. [2021-11-25 17:55:49,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:49,459 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 779 transitions. [2021-11-25 17:55:49,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 17:55:49,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:49,461 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:49,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 17:55:49,461 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:49,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:49,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1011258181, now seen corresponding path program 1 times [2021-11-25 17:55:49,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:49,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165085725] [2021-11-25 17:55:49,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:49,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:49,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:49,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:49,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:49,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165085725] [2021-11-25 17:55:49,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165085725] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:49,605 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:49,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:55:49,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159535603] [2021-11-25 17:55:49,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:49,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:55:49,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:49,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:55:49,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:55:49,608 INFO L87 Difference]: Start difference. First operand 540 states and 779 transitions. Second operand has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:49,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:49,910 INFO L93 Difference]: Finished difference Result 2244 states and 3247 transitions. [2021-11-25 17:55:49,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:55:49,910 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 17:55:49,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:49,922 INFO L225 Difference]: With dead ends: 2244 [2021-11-25 17:55:49,922 INFO L226 Difference]: Without dead ends: 1730 [2021-11-25 17:55:49,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:55:49,931 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 340 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:49,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [340 Valid, 362 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:49,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1730 states. [2021-11-25 17:55:50,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1730 to 1724. [2021-11-25 17:55:50,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1724 states, 1723 states have (on average 1.441091120139292) internal successors, (2483), 1723 states have internal predecessors, (2483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:50,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1724 states to 1724 states and 2483 transitions. [2021-11-25 17:55:50,142 INFO L78 Accepts]: Start accepts. Automaton has 1724 states and 2483 transitions. Word has length 49 [2021-11-25 17:55:50,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:50,145 INFO L470 AbstractCegarLoop]: Abstraction has 1724 states and 2483 transitions. [2021-11-25 17:55:50,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:50,145 INFO L276 IsEmpty]: Start isEmpty. Operand 1724 states and 2483 transitions. [2021-11-25 17:55:50,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 17:55:50,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:50,155 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:50,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 17:55:50,156 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:50,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:50,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1106104100, now seen corresponding path program 1 times [2021-11-25 17:55:50,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:50,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081745615] [2021-11-25 17:55:50,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:50,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:50,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:50,251 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:50,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:50,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081745615] [2021-11-25 17:55:50,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081745615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:50,252 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:50,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:55:50,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33629018] [2021-11-25 17:55:50,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:50,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:55:50,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:50,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:55:50,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:55:50,256 INFO L87 Difference]: Start difference. First operand 1724 states and 2483 transitions. Second operand has 5 states, 5 states have (on average 10.2) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:50,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:50,737 INFO L93 Difference]: Finished difference Result 4430 states and 6427 transitions. [2021-11-25 17:55:50,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:55:50,737 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.2) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 17:55:50,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:50,753 INFO L225 Difference]: With dead ends: 4430 [2021-11-25 17:55:50,753 INFO L226 Difference]: Without dead ends: 2732 [2021-11-25 17:55:50,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:55:50,760 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 446 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 446 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:50,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [446 Valid, 108 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 17:55:50,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2732 states. [2021-11-25 17:55:51,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2732 to 2730. [2021-11-25 17:55:51,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2730 states, 2729 states have (on average 1.4338585562477097) internal successors, (3913), 2729 states have internal predecessors, (3913), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:51,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2730 states to 2730 states and 3913 transitions. [2021-11-25 17:55:51,069 INFO L78 Accepts]: Start accepts. Automaton has 2730 states and 3913 transitions. Word has length 51 [2021-11-25 17:55:51,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:51,070 INFO L470 AbstractCegarLoop]: Abstraction has 2730 states and 3913 transitions. [2021-11-25 17:55:51,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.2) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:51,070 INFO L276 IsEmpty]: Start isEmpty. Operand 2730 states and 3913 transitions. [2021-11-25 17:55:51,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 17:55:51,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:51,071 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:51,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 17:55:51,072 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:51,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:51,072 INFO L85 PathProgramCache]: Analyzing trace with hash 140224777, now seen corresponding path program 1 times [2021-11-25 17:55:51,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:51,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987622610] [2021-11-25 17:55:51,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:51,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:51,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:51,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:51,323 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:51,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987622610] [2021-11-25 17:55:51,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987622610] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:55:51,324 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:55:51,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-25 17:55:51,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028432146] [2021-11-25 17:55:51,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:55:51,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:55:51,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:55:51,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:55:51,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:55:51,327 INFO L87 Difference]: Start difference. First operand 2730 states and 3913 transitions. Second operand has 9 states, 9 states have (on average 5.666666666666667) internal successors, (51), 9 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:52,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:55:52,076 INFO L93 Difference]: Finished difference Result 5162 states and 7419 transitions. [2021-11-25 17:55:52,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 17:55:52,077 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.666666666666667) internal successors, (51), 9 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 17:55:52,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:55:52,108 INFO L225 Difference]: With dead ends: 5162 [2021-11-25 17:55:52,108 INFO L226 Difference]: Without dead ends: 5160 [2021-11-25 17:55:52,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2021-11-25 17:55:52,113 INFO L933 BasicCegarLoop]: 296 mSDtfsCounter, 704 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 704 SdHoareTripleChecker+Valid, 1436 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:55:52,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [704 Valid, 1436 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:55:52,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5160 states. [2021-11-25 17:55:52,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5160 to 2977. [2021-11-25 17:55:52,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2977 states, 2976 states have (on average 1.4341397849462365) internal successors, (4268), 2976 states have internal predecessors, (4268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:52,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2977 states to 2977 states and 4268 transitions. [2021-11-25 17:55:52,475 INFO L78 Accepts]: Start accepts. Automaton has 2977 states and 4268 transitions. Word has length 51 [2021-11-25 17:55:52,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:55:52,475 INFO L470 AbstractCegarLoop]: Abstraction has 2977 states and 4268 transitions. [2021-11-25 17:55:52,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.666666666666667) internal successors, (51), 9 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:55:52,476 INFO L276 IsEmpty]: Start isEmpty. Operand 2977 states and 4268 transitions. [2021-11-25 17:55:52,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 17:55:52,477 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:55:52,478 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:55:52,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 17:55:52,478 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:55:52,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:55:52,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1871190746, now seen corresponding path program 1 times [2021-11-25 17:55:52,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:55:52,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892866421] [2021-11-25 17:55:52,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:52,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:55:52,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:53,208 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:53,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:55:53,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892866421] [2021-11-25 17:55:53,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892866421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:55:53,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739267797] [2021-11-25 17:55:53,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:55:53,209 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:55:53,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:55:53,211 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:55:53,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:55:53,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:55:53,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 17:55:53,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:55:55,308 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:55:55,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:56:04,100 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:56:04,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739267797] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:56:04,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [376258516] [2021-11-25 17:56:04,131 INFO L159 IcfgInterpreter]: Started Sifa with 52 locations of interest [2021-11-25 17:56:04,131 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:56:04,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:56:04,141 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:56:04,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:56:05,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:05,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:05,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:05,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:05,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:05,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:56:05,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 12 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 21 [2021-11-25 17:56:05,422 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:05,423 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:05,424 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:56:05,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 21 [2021-11-25 17:56:33,603 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 17:57:05,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36118#(and (<= |ULTIMATE.start_main_~check__tmp~0#1| 1) (<= ~send3~0 127) (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= (+ |ULTIMATE.start_main_~node4__m4~0#1| 1) 0) (= ~p4~0 0) (<= ~st3~0 0) (<= |ULTIMATE.start_main_~assert__arg~0#1| 1) (<= 0 |ULTIMATE.start_main_~check__tmp~0#1|) (<= 0 ~send4~0) (<= ~id4~0 127) (<= 0 (+ |ULTIMATE.start_main_~node4__m4~0#1| 1)) (<= 0 ~id1~0) (= ~__return_19572~0 0) (<= 0 (+ ~p4_old~0 1)) (<= 0 ~st4~0) (<= 0 (+ |ULTIMATE.start_main_~node3__m3~0#1| 1)) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_main_~main__c1~0#1| 1) (<= ~send4~0 127) (<= 0 (+ ~p3_old~0 1)) (<= 0 |ULTIMATE.start_main_~main__i2~0#1|) (<= ~mode2~0 1) (<= (+ ~p4_old~0 1) 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 (+ |ULTIMATE.start_main_~node1__m1~0#1| 1)) (<= ~mode4~0 1) (<= 0 (+ ~p2_old~0 1)) (<= ~id1~0 127) (<= (+ ~p3_old~0 1) 0) (<= |ULTIMATE.start_main_~__tmp_1~0#1| 1) (= |ULTIMATE.start_main_~init__tmp~0#1| 1) (<= 0 |ULTIMATE.start_main_~__tmp_1~0#1|) (<= 0 (+ ~p2_new~0 1)) (<= (+ |ULTIMATE.start_main_~node1__m1~0#1| 1) 0) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= 1 ~__return_19350~0) (<= (+ ~p2_new~0 1) 0) (<= ~__return_19485~0 1) (<= ~__return_19350~0 1) (<= ~st4~0 0) (<= 0 ~id4~0) (<= 0 (+ ~p4_new~0 1)) (<= (+ ~p4_new~0 1) 0) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (<= 0 ~__return_19485~0) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (= ~p3~0 0) (<= (+ ~p2_old~0 1) 0) (<= 0 (+ ~p1_new~0 1)) (= (mod |ULTIMATE.start_main_~assert__arg~0#1| 256) 0) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~main__c1~0#1|) (= ~__return_main~0 0) (<= (+ |ULTIMATE.start_main_~node3__m3~0#1| 1) 0) (<= 0 |ULTIMATE.start_main_~assert__arg~0#1|) (= |#NULL.base| 0))' at error location [2021-11-25 17:57:05,080 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 17:57:05,080 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 17:57:05,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 46 [2021-11-25 17:57:05,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165472820] [2021-11-25 17:57:05,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 17:57:05,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 17:57:05,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:57:05,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 17:57:05,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1199, Invalid=7921, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 17:57:05,086 INFO L87 Difference]: Start difference. First operand 2977 states and 4268 transitions. Second operand has 46 states, 46 states have (on average 3.891304347826087) internal successors, (179), 46 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:26,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:26,297 INFO L93 Difference]: Finished difference Result 55067 states and 78938 transitions. [2021-11-25 17:58:26,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 310 states. [2021-11-25 17:58:26,298 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.891304347826087) internal successors, (179), 46 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 17:58:26,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:26,508 INFO L225 Difference]: With dead ends: 55067 [2021-11-25 17:58:26,509 INFO L226 Difference]: Without dead ends: 52144 [2021-11-25 17:58:26,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 396 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70876 ImplicationChecksByTransitivity, 95.6s TimeCoverageRelationStatistics Valid=23468, Invalid=134538, Unknown=0, NotChecked=0, Total=158006 [2021-11-25 17:58:26,564 INFO L933 BasicCegarLoop]: 254 mSDtfsCounter, 13678 mSDsluCounter, 6577 mSDsCounter, 0 mSdLazyCounter, 8579 mSolverCounterSat, 998 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13678 SdHoareTripleChecker+Valid, 6824 SdHoareTripleChecker+Invalid, 9577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 998 IncrementalHoareTripleChecker+Valid, 8579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:26,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13678 Valid, 6824 Invalid, 9577 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [998 Valid, 8579 Invalid, 0 Unknown, 0 Unchecked, 9.6s Time] [2021-11-25 17:58:26,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52144 states. [2021-11-25 17:58:30,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52144 to 18008. [2021-11-25 17:58:30,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18008 states, 18007 states have (on average 1.3924029544066197) internal successors, (25073), 18007 states have internal predecessors, (25073), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:30,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18008 states to 18008 states and 25073 transitions. [2021-11-25 17:58:30,682 INFO L78 Accepts]: Start accepts. Automaton has 18008 states and 25073 transitions. Word has length 61 [2021-11-25 17:58:30,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:30,683 INFO L470 AbstractCegarLoop]: Abstraction has 18008 states and 25073 transitions. [2021-11-25 17:58:30,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 3.891304347826087) internal successors, (179), 46 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:30,684 INFO L276 IsEmpty]: Start isEmpty. Operand 18008 states and 25073 transitions. [2021-11-25 17:58:30,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 17:58:30,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:30,686 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:30,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:30,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:30,914 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:30,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:30,915 INFO L85 PathProgramCache]: Analyzing trace with hash 515170723, now seen corresponding path program 1 times [2021-11-25 17:58:30,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:30,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996958882] [2021-11-25 17:58:30,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:30,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:30,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:30,995 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 17:58:30,995 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:30,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996958882] [2021-11-25 17:58:30,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996958882] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:58:30,996 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:58:30,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:58:30,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957926887] [2021-11-25 17:58:30,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:30,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:58:30,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:58:30,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:58:30,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:58:30,998 INFO L87 Difference]: Start difference. First operand 18008 states and 25073 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:35,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:35,619 INFO L93 Difference]: Finished difference Result 44591 states and 62498 transitions. [2021-11-25 17:58:35,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:58:35,620 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 17:58:35,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:35,681 INFO L225 Difference]: With dead ends: 44591 [2021-11-25 17:58:35,681 INFO L226 Difference]: Without dead ends: 26739 [2021-11-25 17:58:35,707 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:58:35,708 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 427 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 427 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:35,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [427 Valid, 118 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:58:35,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26739 states. [2021-11-25 17:58:40,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26739 to 26737. [2021-11-25 17:58:40,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26737 states, 26736 states have (on average 1.3911953919808497) internal successors, (37195), 26736 states have internal predecessors, (37195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:40,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26737 states to 26737 states and 37195 transitions. [2021-11-25 17:58:40,298 INFO L78 Accepts]: Start accepts. Automaton has 26737 states and 37195 transitions. Word has length 61 [2021-11-25 17:58:40,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:40,298 INFO L470 AbstractCegarLoop]: Abstraction has 26737 states and 37195 transitions. [2021-11-25 17:58:40,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 17:58:40,299 INFO L276 IsEmpty]: Start isEmpty. Operand 26737 states and 37195 transitions. [2021-11-25 17:58:40,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 17:58:40,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:40,302 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:40,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 17:58:40,302 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:40,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:40,303 INFO L85 PathProgramCache]: Analyzing trace with hash 650931934, now seen corresponding path program 1 times [2021-11-25 17:58:40,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:58:40,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028120917] [2021-11-25 17:58:40,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:40,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:58:40,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:40,782 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:40,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:58:40,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028120917] [2021-11-25 17:58:40,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028120917] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:40,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563435269] [2021-11-25 17:58:40,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:40,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:40,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:58:40,783 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:58:40,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cf29f631-7549-4b8f-af41-c40c8e7deb9b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 17:58:40,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:40,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 17:58:40,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:42,224 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:42,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:50,546 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 17:58:50,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563435269] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:50,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1153681018] [2021-11-25 17:58:50,550 INFO L159 IcfgInterpreter]: Started Sifa with 52 locations of interest [2021-11-25 17:58:50,551 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 17:58:50,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 17:58:50,551 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 17:58:50,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 17:58:51,286 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:58:51,288 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:58:51,289 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:58:51,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 21 [2021-11-25 17:58:51,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:51,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:51,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:51,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:51,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:51,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:58:51,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 12 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 21 [2021-11-25 17:59:35,622 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:00:05,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '269290#(and (<= |ULTIMATE.start_main_~check__tmp~0#1| 1) (<= 0 ~p4~0) (<= ~p3~0 0) (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= (+ |ULTIMATE.start_main_~node4__m4~0#1| 1) 0) (<= 0 |#NULL.base|) (<= 0 ~mode1~0) (<= |ULTIMATE.start_main_~assert__arg~0#1| 1) (<= 0 |ULTIMATE.start_main_~check__tmp~0#1|) (<= 0 ~send4~0) (<= 0 (+ ~p1_old~0 1)) (<= ~id4~0 127) (<= 0 (+ |ULTIMATE.start_main_~node4__m4~0#1| 1)) (<= 0 ~id1~0) (<= |ULTIMATE.start_main_~main__i2~0#1| 8) (<= 0 (+ ~p4_old~0 1)) (<= 0 ~st4~0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_main_~main__c1~0#1| 1) (<= |ULTIMATE.start_main_~node2____CPAchecker_TMP_0~0#1| 127) (<= 0 ~mode3~0) (<= ~send4~0 127) (<= 0 (+ ~p3_old~0 1)) (<= 0 |ULTIMATE.start_main_~main__i2~0#1|) (<= |#NULL.offset| 0) (<= 0 ~__return_19572~0) (<= ~mode2~0 1) (<= (+ ~p4_old~0 1) 0) (<= 0 ~st2~0) (<= ~p1~0 0) (<= ~__return_main~0 0) (<= ~mode3~0 1) (<= 0 ~p2~0) (<= 0 ~p3~0) (<= 0 ~send2~0) (<= 0 (+ |ULTIMATE.start_main_~node1__m1~0#1| 1)) (<= ~mode4~0 1) (<= ~id1~0 127) (<= (+ ~p3_old~0 1) 0) (<= |ULTIMATE.start_main_~__tmp_1~0#1| 1) (<= ~send2~0 127) (<= 0 |ULTIMATE.start_main_~__tmp_1~0#1|) (<= 0 (+ ~p2_new~0 1)) (<= (+ |ULTIMATE.start_main_~node1__m1~0#1| 1) 0) (<= (+ ~nomsg~0 1) 0) (<= ~p4~0 0) (<= ~mode1~0 1) (<= ~st2~0 0) (<= 1 ~__return_19350~0) (<= (+ ~p2_new~0 1) 0) (<= ~__return_19485~0 1) (<= |#NULL.base| 0) (<= ~__return_19350~0 1) (<= ~st4~0 0) (<= 0 |ULTIMATE.start_main_~node2____CPAchecker_TMP_0~0#1|) (<= ~__return_19572~0 0) (<= 0 ~id4~0) (<= 0 (+ ~p4_new~0 1)) (<= 0 ~__return_main~0) (<= (+ ~p4_new~0 1) 0) (<= ~id3~0 127) (<= 0 ~id2~0) (<= 0 (+ ~nomsg~0 1)) (<= ~p2~0 0) (<= 0 ~mode2~0) (<= 0 ~__return_19485~0) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_main_~init__tmp~0#1| 1) (<= 0 |#NULL.offset|) (<= 0 (+ |ULTIMATE.start_main_~node2__m2~0#1| 1)) (<= 0 (+ ~p1_new~0 1)) (= (mod |ULTIMATE.start_main_~assert__arg~0#1| 256) 0) (<= (+ ~p1_old~0 1) 0) (<= 0 ~p1~0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~main__c1~0#1|) (<= (+ |ULTIMATE.start_main_~node2__m2~0#1| 1) 0) (<= 0 |ULTIMATE.start_main_~assert__arg~0#1|) (<= 1 |ULTIMATE.start_main_~init__tmp~0#1|))' at error location [2021-11-25 18:00:05,432 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:00:05,433 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:00:05,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 46 [2021-11-25 18:00:05,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894172869] [2021-11-25 18:00:05,433 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:05,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 18:00:05,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:00:05,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 18:00:05,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=7754, Unknown=0, NotChecked=0, Total=8930 [2021-11-25 18:00:05,436 INFO L87 Difference]: Start difference. First operand 26737 states and 37195 transitions. Second operand has 46 states, 46 states have (on average 3.891304347826087) internal successors, (179), 46 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:02:16,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:16,280 INFO L93 Difference]: Finished difference Result 243009 states and 342487 transitions. [2021-11-25 18:02:16,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 368 states. [2021-11-25 18:02:16,280 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.891304347826087) internal successors, (179), 46 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 18:02:16,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:16,809 INFO L225 Difference]: With dead ends: 243009 [2021-11-25 18:02:16,809 INFO L226 Difference]: Without dead ends: 216306 [2021-11-25 18:02:16,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 453 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92678 ImplicationChecksByTransitivity, 111.1s TimeCoverageRelationStatistics Valid=29662, Invalid=176908, Unknown=0, NotChecked=0, Total=206570 [2021-11-25 18:02:16,913 INFO L933 BasicCegarLoop]: 296 mSDtfsCounter, 15295 mSDsluCounter, 6554 mSDsCounter, 0 mSdLazyCounter, 8403 mSolverCounterSat, 1121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15295 SdHoareTripleChecker+Valid, 6844 SdHoareTripleChecker+Invalid, 9524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1121 IncrementalHoareTripleChecker+Valid, 8403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:16,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15295 Valid, 6844 Invalid, 9524 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1121 Valid, 8403 Invalid, 0 Unknown, 0 Unchecked, 8.6s Time] [2021-11-25 18:02:17,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216306 states.