./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH --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 e6ceef81d5d5c6ec4b435ae3bf6300a70928e11f3a8c1d376463323495e50f12 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:46:26,842 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:46:26,846 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:46:26,888 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:46:26,889 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:46:26,891 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:46:26,893 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:46:26,896 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:46:26,899 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:46:26,900 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:46:26,901 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:46:26,903 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:46:26,904 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:46:26,906 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:46:26,908 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:46:26,910 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:46:26,911 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:46:26,913 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:46:26,916 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:46:26,919 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:46:26,922 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:46:26,923 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:46:26,925 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:46:26,926 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:46:26,931 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:46:26,931 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:46:26,932 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:46:26,933 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:46:26,934 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:46:26,936 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:46:26,936 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:46:26,937 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:46:26,938 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:46:26,940 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:46:26,941 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:46:26,942 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:46:26,943 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:46:26,943 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:46:26,944 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:46:26,945 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:46:26,946 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:46:26,947 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 04:46:26,978 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:46:26,979 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:46:26,980 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:46:26,980 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:46:26,980 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:46:26,981 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:46:26,981 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:46:26,982 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:46:26,982 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:46:26,982 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:46:26,983 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:46:26,983 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:46:26,983 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:46:26,984 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:46:26,984 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:46:26,985 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:46:26,986 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 04:46:26,986 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:46:26,986 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 04:46:26,987 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:46:26,987 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:46:26,987 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:46:26,988 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:46:26,988 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 04:46:26,988 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 04:46:26,989 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:46:26,989 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:46:26,989 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:46:26,990 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:46:26,990 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:46:26,991 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:46:26,991 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:46:26,991 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:46:26,992 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:46:26,992 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:46:26,992 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:46:26,992 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:46:26,993 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:46:26,993 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:46:26,993 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_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e6ceef81d5d5c6ec4b435ae3bf6300a70928e11f3a8c1d376463323495e50f12 [2021-11-03 04:46:27,289 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:46:27,325 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:46:27,327 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:46:27,328 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:46:27,343 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:46:27,344 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c [2021-11-03 04:46:27,436 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/data/eb11ee12f/accbb76e6183436fa32a8e0c7cacd7e9/FLAG8bf0ec630 [2021-11-03 04:46:27,909 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:46:27,909 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c [2021-11-03 04:46:27,916 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/data/eb11ee12f/accbb76e6183436fa32a8e0c7cacd7e9/FLAG8bf0ec630 [2021-11-03 04:46:28,304 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/data/eb11ee12f/accbb76e6183436fa32a8e0c7cacd7e9 [2021-11-03 04:46:28,307 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:46:28,310 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:46:28,315 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:46:28,315 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:46:28,319 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:46:28,320 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,323 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25aabe89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28, skipping insertion in model container [2021-11-03 04:46:28,324 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,332 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:46:28,344 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:46:28,522 WARN L228 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_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[557,570] [2021-11-03 04:46:28,526 WARN L228 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_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[613,626] [2021-11-03 04:46:28,527 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:46:28,535 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:46:28,549 WARN L228 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_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[557,570] [2021-11-03 04:46:28,550 WARN L228 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_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[613,626] [2021-11-03 04:46:28,550 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:46:28,564 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:46:28,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28 WrapperNode [2021-11-03 04:46:28,565 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:46:28,566 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:46:28,566 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:46:28,566 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:46:28,575 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,581 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,600 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:46:28,601 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:46:28,601 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:46:28,601 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:46:28,610 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,611 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,612 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,612 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,616 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,620 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,621 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,623 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:46:28,624 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:46:28,624 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:46:28,624 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:46:28,628 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (1/1) ... [2021-11-03 04:46:28,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:46:28,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:28,664 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:46:28,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:46:28,722 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:46:28,722 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:46:28,723 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:46:28,723 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:46:29,056 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:46:29,057 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-03 04:46:29,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:46:29 BoogieIcfgContainer [2021-11-03 04:46:29,060 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:46:29,062 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:46:29,062 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:46:29,075 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:46:29,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:46:28" (1/3) ... [2021-11-03 04:46:29,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d7597a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:46:29, skipping insertion in model container [2021-11-03 04:46:29,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:46:28" (2/3) ... [2021-11-03 04:46:29,085 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d7597a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:46:29, skipping insertion in model container [2021-11-03 04:46:29,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:46:29" (3/3) ... [2021-11-03 04:46:29,087 INFO L111 eAbstractionObserver]: Analyzing ICFG linear-inequality-inv-a.c [2021-11-03 04:46:29,093 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:46:29,097 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-03 04:46:29,206 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:46:29,220 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 [2021-11-03 04:46:29,221 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-03 04:46:29,244 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 8 states have (on average 1.75) internal successors, (14), 10 states have internal predecessors, (14), 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) [2021-11-03 04:46:29,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-03 04:46:29,252 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:29,253 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-03 04:46:29,253 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:29,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:29,269 INFO L85 PathProgramCache]: Analyzing trace with hash 63046149, now seen corresponding path program 1 times [2021-11-03 04:46:29,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:29,292 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466347967] [2021-11-03 04:46:29,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:29,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:29,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:29,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:29,521 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:29,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466347967] [2021-11-03 04:46:29,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466347967] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:46:29,523 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:46:29,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:46:29,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431573797] [2021-11-03 04:46:29,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:46:29,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:46:29,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:46:29,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:46:29,549 INFO L87 Difference]: Start difference. First operand has 11 states, 8 states have (on average 1.75) internal successors, (14), 10 states have internal predecessors, (14), 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 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-03 04:46:29,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:46:29,579 INFO L93 Difference]: Finished difference Result 20 states and 25 transitions. [2021-11-03 04:46:29,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:46:29,581 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 5 [2021-11-03 04:46:29,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:46:29,590 INFO L225 Difference]: With dead ends: 20 [2021-11-03 04:46:29,590 INFO L226 Difference]: Without dead ends: 10 [2021-11-03 04:46:29,593 INFO L786 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 [2021-11-03 04:46:29,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-03 04:46:29,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-03 04:46:29,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 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) [2021-11-03 04:46:29,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2021-11-03 04:46:29,627 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 5 [2021-11-03 04:46:29,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:46:29,628 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2021-11-03 04:46:29,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-03 04:46:29,629 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2021-11-03 04:46:29,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-03 04:46:29,629 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:29,630 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-03 04:46:29,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:46:29,630 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:29,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:29,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1953761755, now seen corresponding path program 1 times [2021-11-03 04:46:29,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:29,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445891408] [2021-11-03 04:46:29,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:29,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:29,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:29,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:29,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:29,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445891408] [2021-11-03 04:46:29,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445891408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:46:29,731 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705097107] [2021-11-03 04:46:29,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:29,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:29,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:29,736 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:46:29,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:46:29,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:29,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-03 04:46:29,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:46:29,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:29,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:46:30,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:30,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705097107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:46:30,013 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [412442945] [2021-11-03 04:46:30,051 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-03 04:46:30,052 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:46:30,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:46:30,063 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:46:30,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:46:30,096 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,104 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:30,105 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,106 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:46:30,108 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:30,109 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,109 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:46:30,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:46:30,135 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_9|], 21=[|v_#valid_10|]} [2021-11-03 04:46:30,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:46:30,161 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:30,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:30,165 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:30,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,192 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:30,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:46:30,220 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,223 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:30,224 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:30,226 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:30,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,242 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,245 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,247 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:46:30,248 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:46:30,248 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:46:30,258 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:30,266 INFO L185 QuantifierPusher]: treesize reduction 10, result has 91.2 percent of original size 104 [2021-11-03 04:46:30,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,416 INFO L180 QuantifierPusher]: treesize reduction 10, result has 96.6 percent of original size [2021-11-03 04:46:30,463 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-03 04:46:30,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:30,579 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:46:30,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:46:30,611 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:46:31,112 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:46:31,112 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:46:31,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-03 04:46:31,114 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195021286] [2021-11-03 04:46:31,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-03 04:46:31,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:46:31,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-03 04:46:31,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-03 04:46:31,119 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 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) [2021-11-03 04:46:31,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:46:31,229 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-03 04:46:31,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-03 04:46:31,231 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 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 6 [2021-11-03 04:46:31,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:46:31,232 INFO L225 Difference]: With dead ends: 27 [2021-11-03 04:46:31,233 INFO L226 Difference]: Without dead ends: 21 [2021-11-03 04:46:31,234 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-11-03 04:46:31,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-03 04:46:31,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 14. [2021-11-03 04:46:31,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 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) [2021-11-03 04:46:31,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-03 04:46:31,239 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 6 [2021-11-03 04:46:31,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:46:31,241 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-03 04:46:31,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 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) [2021-11-03 04:46:31,242 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-03 04:46:31,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:46:31,245 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:31,245 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-03 04:46:31,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-03 04:46:31,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-03 04:46:31,446 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:31,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:31,447 INFO L85 PathProgramCache]: Analyzing trace with hash 643607479, now seen corresponding path program 1 times [2021-11-03 04:46:31,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:31,447 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963349150] [2021-11-03 04:46:31,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:31,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:31,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:31,615 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:31,616 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:31,616 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963349150] [2021-11-03 04:46:31,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963349150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:46:31,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696435435] [2021-11-03 04:46:31,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:31,618 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:31,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:31,619 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:46:31,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-03 04:46:31,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:31,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-03 04:46:31,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:46:31,867 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:31,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:46:32,053 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:32,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696435435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:46:32,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [990086218] [2021-11-03 04:46:32,057 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-03 04:46:32,057 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:46:32,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:46:32,058 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:46:32,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:46:32,083 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,085 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:32,086 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,087 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:46:32,088 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:32,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:46:32,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:46:32,104 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_10|], 21=[|v_#valid_11|]} [2021-11-03 04:46:32,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:46:32,129 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:32,135 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:32,137 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:32,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:32,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:46:32,182 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:32,189 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:32,190 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:32,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,196 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,199 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:46:32,203 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:46:32,204 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:46:32,214 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-03 04:46:32,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,297 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:32,317 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-03 04:46:32,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:32,425 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:46:32,430 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:46:32,440 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:46:32,917 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:46:32,918 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:46:32,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-03 04:46:32,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626892622] [2021-11-03 04:46:32,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 04:46:32,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:46:32,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 04:46:32,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-03 04:46:32,920 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 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) [2021-11-03 04:46:32,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:46:32,983 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-03 04:46:32,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-03 04:46:32,984 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 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 8 [2021-11-03 04:46:32,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:46:32,985 INFO L225 Difference]: With dead ends: 25 [2021-11-03 04:46:32,985 INFO L226 Difference]: Without dead ends: 17 [2021-11-03 04:46:32,986 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-03 04:46:32,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-03 04:46:32,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-11-03 04:46:32,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 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) [2021-11-03 04:46:32,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-03 04:46:32,990 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 8 [2021-11-03 04:46:32,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:46:32,990 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-03 04:46:32,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 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) [2021-11-03 04:46:32,991 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-03 04:46:32,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-03 04:46:32,991 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:32,992 INFO L513 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1] [2021-11-03 04:46:33,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-03 04:46:33,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-03 04:46:33,193 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:33,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:33,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1544534139, now seen corresponding path program 2 times [2021-11-03 04:46:33,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:33,194 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664108469] [2021-11-03 04:46:33,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:33,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:33,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:33,299 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:33,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:33,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664108469] [2021-11-03 04:46:33,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664108469] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:46:33,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140655346] [2021-11-03 04:46:33,301 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:46:33,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:33,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:33,302 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:46:33,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-03 04:46:33,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-03 04:46:33,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:46:33,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-03 04:46:33,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:46:33,589 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:33,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:46:33,871 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:33,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140655346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:46:33,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770892642] [2021-11-03 04:46:33,873 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-03 04:46:33,873 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:46:33,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:46:33,874 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:46:33,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:46:33,880 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,881 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:33,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:46:33,883 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:33,887 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,888 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:46:33,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:46:33,903 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_11|], 21=[|v_#valid_12|]} [2021-11-03 04:46:33,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:46:33,916 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,917 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:33,917 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,918 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:33,918 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:33,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:33,922 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:33,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:46:33,948 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:33,951 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,952 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:33,952 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:33,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:33,958 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,960 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:46:33,962 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:46:33,963 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:46:33,968 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:33,972 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-03 04:46:33,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:33,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:33,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:34,018 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:34,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-03 04:46:34,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:34,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:34,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:34,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:34,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:34,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:34,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:34,102 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:46:34,106 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:46:34,113 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:46:34,536 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:46:34,536 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:46:34,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-03 04:46:34,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868299136] [2021-11-03 04:46:34,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-03 04:46:34,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:46:34,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-03 04:46:34,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2021-11-03 04:46:34,538 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 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) [2021-11-03 04:46:34,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:46:34,889 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2021-11-03 04:46:34,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-03 04:46:34,890 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 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 9 [2021-11-03 04:46:34,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:46:34,891 INFO L225 Difference]: With dead ends: 39 [2021-11-03 04:46:34,891 INFO L226 Difference]: Without dead ends: 35 [2021-11-03 04:46:34,891 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=177, Invalid=423, Unknown=0, NotChecked=0, Total=600 [2021-11-03 04:46:34,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-03 04:46:34,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 20. [2021-11-03 04:46:34,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 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) [2021-11-03 04:46:34,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-03 04:46:34,896 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 9 [2021-11-03 04:46:34,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:46:34,896 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-03 04:46:34,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 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) [2021-11-03 04:46:34,897 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-03 04:46:34,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-03 04:46:34,897 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:34,897 INFO L513 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2021-11-03 04:46:34,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-03 04:46:35,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-03 04:46:35,120 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:35,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:35,120 INFO L85 PathProgramCache]: Analyzing trace with hash -1895401929, now seen corresponding path program 2 times [2021-11-03 04:46:35,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:35,120 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349658338] [2021-11-03 04:46:35,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:35,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:35,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:35,297 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:35,297 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:35,297 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349658338] [2021-11-03 04:46:35,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349658338] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:46:35,298 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908542970] [2021-11-03 04:46:35,298 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:46:35,298 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:35,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:35,299 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:46:35,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-03 04:46:35,384 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-03 04:46:35,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:46:35,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-03 04:46:35,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:46:35,577 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:35,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:46:36,087 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:36,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908542970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:46:36,087 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1627761637] [2021-11-03 04:46:36,089 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-03 04:46:36,090 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:46:36,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:46:36,090 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:46:36,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:46:36,095 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,096 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:36,097 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,097 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:46:36,098 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:36,098 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,100 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:46:36,101 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:46:36,104 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_12|], 21=[|v_#valid_13|]} [2021-11-03 04:46:36,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:46:36,114 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,115 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:36,116 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,116 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:36,116 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:36,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,120 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:36,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:46:36,137 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:36,139 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,140 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:36,140 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:36,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,144 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,145 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,149 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:46:36,149 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:46:36,150 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:46:36,154 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:36,158 INFO L185 QuantifierPusher]: treesize reduction 6, result has 94.5 percent of original size 104 [2021-11-03 04:46:36,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,219 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.9 percent of original size [2021-11-03 04:46:36,231 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-03 04:46:36,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:36,285 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:46:36,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:46:36,297 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:46:36,696 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:46:36,696 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:46:36,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2021-11-03 04:46:36,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219733065] [2021-11-03 04:46:36,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-03 04:46:36,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:46:36,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-03 04:46:36,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2021-11-03 04:46:36,698 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 16 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 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) [2021-11-03 04:46:36,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:46:36,886 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2021-11-03 04:46:36,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-03 04:46:36,887 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 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 12 [2021-11-03 04:46:36,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:46:36,889 INFO L225 Difference]: With dead ends: 41 [2021-11-03 04:46:36,889 INFO L226 Difference]: Without dead ends: 27 [2021-11-03 04:46:36,890 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2021-11-03 04:46:36,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-03 04:46:36,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-11-03 04:46:36,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 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) [2021-11-03 04:46:36,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-03 04:46:36,895 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 12 [2021-11-03 04:46:36,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:46:36,896 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-03 04:46:36,896 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 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) [2021-11-03 04:46:36,896 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-03 04:46:36,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-03 04:46:36,897 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:36,897 INFO L513 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1] [2021-11-03 04:46:36,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-03 04:46:37,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:37,114 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:37,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:37,115 INFO L85 PathProgramCache]: Analyzing trace with hash 779749317, now seen corresponding path program 3 times [2021-11-03 04:46:37,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:37,115 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51611811] [2021-11-03 04:46:37,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:37,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:37,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:37,301 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:37,301 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:37,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51611811] [2021-11-03 04:46:37,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51611811] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:46:37,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732446933] [2021-11-03 04:46:37,302 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:46:37,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:37,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:37,303 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:46:37,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-03 04:46:37,437 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:46:37,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:46:37,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-03 04:46:37,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:46:37,752 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:37,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:46:38,701 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:38,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732446933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:46:38,702 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1421024964] [2021-11-03 04:46:38,704 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-03 04:46:38,704 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:46:38,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:46:38,704 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:46:38,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:46:38,709 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,710 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:38,710 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,711 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:46:38,712 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:38,712 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,712 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:46:38,714 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:46:38,717 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_13|], 21=[|v_#valid_14|]} [2021-11-03 04:46:38,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:46:38,727 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,728 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:38,728 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,729 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:38,729 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:38,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,733 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:38,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:46:38,750 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:38,755 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,755 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:38,755 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:38,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,759 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,762 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,763 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:46:38,764 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:46:38,764 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:46:38,771 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:38,775 INFO L185 QuantifierPusher]: treesize reduction 6, result has 94.5 percent of original size 104 [2021-11-03 04:46:38,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,840 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.9 percent of original size [2021-11-03 04:46:38,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-03 04:46:38,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:38,898 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:46:38,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:46:38,906 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:46:39,240 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:46:39,241 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:46:39,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2021-11-03 04:46:39,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563089983] [2021-11-03 04:46:39,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-03 04:46:39,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:46:39,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-03 04:46:39,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=541, Unknown=0, NotChecked=0, Total=812 [2021-11-03 04:46:39,247 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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) [2021-11-03 04:46:40,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:46:40,180 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2021-11-03 04:46:40,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-03 04:46:40,181 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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 15 [2021-11-03 04:46:40,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:46:40,182 INFO L225 Difference]: With dead ends: 69 [2021-11-03 04:46:40,182 INFO L226 Difference]: Without dead ends: 63 [2021-11-03 04:46:40,183 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 20 SyntacticMatches, 9 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=771, Invalid=1581, Unknown=0, NotChecked=0, Total=2352 [2021-11-03 04:46:40,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-03 04:46:40,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 32. [2021-11-03 04:46:40,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 31 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) [2021-11-03 04:46:40,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-03 04:46:40,191 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 15 [2021-11-03 04:46:40,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:46:40,192 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-03 04:46:40,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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) [2021-11-03 04:46:40,192 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-03 04:46:40,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-03 04:46:40,193 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:40,193 INFO L513 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1] [2021-11-03 04:46:40,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-03 04:46:40,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-03 04:46:40,419 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:40,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:40,420 INFO L85 PathProgramCache]: Analyzing trace with hash 1916685111, now seen corresponding path program 3 times [2021-11-03 04:46:40,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:40,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165181652] [2021-11-03 04:46:40,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:40,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:40,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:40,698 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:40,698 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:40,698 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165181652] [2021-11-03 04:46:40,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165181652] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:46:40,698 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945838410] [2021-11-03 04:46:40,698 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:46:40,699 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:40,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:40,700 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:46:40,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-03 04:46:41,200 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:46:41,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:46:41,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-03 04:46:41,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:46:41,716 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:41,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:46:43,261 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:43,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945838410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:46:43,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [151934405] [2021-11-03 04:46:43,264 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-03 04:46:43,264 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:46:43,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:46:43,265 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:46:43,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:46:43,275 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,276 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:43,276 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:46:43,277 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:43,278 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,278 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:46:43,280 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:46:43,282 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_14|], 21=[|v_#valid_15|]} [2021-11-03 04:46:43,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:46:43,293 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,294 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:43,294 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,295 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:43,295 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:43,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,299 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:43,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:46:43,323 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,326 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:43,326 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:43,327 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:43,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,331 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,340 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,341 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:46:43,342 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:46:43,342 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:46:43,346 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,350 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 04:46:43,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,395 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:43,404 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-03 04:46:43,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:43,454 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:46:43,457 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:46:43,463 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:46:43,830 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:46:43,830 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:46:43,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2021-11-03 04:46:43,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739583508] [2021-11-03 04:46:43,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-03 04:46:43,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:46:43,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-03 04:46:43,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2021-11-03 04:46:43,833 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 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) [2021-11-03 04:46:44,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:46:44,293 INFO L93 Difference]: Finished difference Result 73 states and 96 transitions. [2021-11-03 04:46:44,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-03 04:46:44,294 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 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 20 [2021-11-03 04:46:44,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:46:44,295 INFO L225 Difference]: With dead ends: 73 [2021-11-03 04:46:44,295 INFO L226 Difference]: Without dead ends: 47 [2021-11-03 04:46:44,296 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 27 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2021-11-03 04:46:44,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-03 04:46:44,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2021-11-03 04:46:44,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.263157894736842) internal successors, (48), 39 states have internal predecessors, (48), 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) [2021-11-03 04:46:44,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-03 04:46:44,304 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 20 [2021-11-03 04:46:44,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:46:44,304 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-03 04:46:44,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 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) [2021-11-03 04:46:44,304 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-03 04:46:44,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-03 04:46:44,305 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:44,305 INFO L513 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1] [2021-11-03 04:46:44,339 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-03 04:46:44,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-03 04:46:44,532 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:44,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:44,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1091700667, now seen corresponding path program 4 times [2021-11-03 04:46:44,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:44,532 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600414182] [2021-11-03 04:46:44,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:44,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:44,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:45,044 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:45,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:45,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600414182] [2021-11-03 04:46:45,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600414182] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:46:45,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065981082] [2021-11-03 04:46:45,045 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:46:45,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:45,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:45,053 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:46:45,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-03 04:46:45,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:45,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-03 04:46:45,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:46:46,047 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:46,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:46:48,945 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:48,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065981082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:46:48,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133514037] [2021-11-03 04:46:48,951 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-03 04:46:48,951 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:46:48,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:46:48,952 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:46:48,952 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:46:48,955 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:48,956 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:48,956 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:48,957 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:46:48,957 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:48,957 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:48,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:46:48,959 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:46:48,961 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_15|], 21=[|v_#valid_16|]} [2021-11-03 04:46:48,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:46:48,972 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:48,972 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:48,973 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:48,973 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:46:48,974 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:48,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:48,978 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:48,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:46:48,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:46:48,994 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:48,996 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:48,996 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:48,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:46:48,997 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:46:48,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,000 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:49,008 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:49,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:46:49,009 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:46:49,010 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:46:49,016 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:49,020 INFO L185 QuantifierPusher]: treesize reduction 6, result has 94.5 percent of original size 104 [2021-11-03 04:46:49,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,064 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.9 percent of original size [2021-11-03 04:46:49,072 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-03 04:46:49,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:46:49,125 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:46:49,128 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:46:49,133 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:46:49,558 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:46:49,558 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:46:49,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2021-11-03 04:46:49,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838121871] [2021-11-03 04:46:49,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-03 04:46:49,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:46:49,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-03 04:46:49,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1099, Invalid=1657, Unknown=0, NotChecked=0, Total=2756 [2021-11-03 04:46:49,561 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 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) [2021-11-03 04:46:52,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:46:52,165 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2021-11-03 04:46:52,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-03 04:46:52,168 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 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 27 [2021-11-03 04:46:52,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:46:52,169 INFO L225 Difference]: With dead ends: 129 [2021-11-03 04:46:52,169 INFO L226 Difference]: Without dead ends: 119 [2021-11-03 04:46:52,174 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 32 SyntacticMatches, 21 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2270 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3255, Invalid=6057, Unknown=0, NotChecked=0, Total=9312 [2021-11-03 04:46:52,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-03 04:46:52,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 56. [2021-11-03 04:46:52,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 54 states have (on average 1.3333333333333333) internal successors, (72), 55 states have internal predecessors, (72), 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) [2021-11-03 04:46:52,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 72 transitions. [2021-11-03 04:46:52,185 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 72 transitions. Word has length 27 [2021-11-03 04:46:52,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:46:52,185 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 72 transitions. [2021-11-03 04:46:52,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 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) [2021-11-03 04:46:52,186 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 72 transitions. [2021-11-03 04:46:52,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 04:46:52,187 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:46:52,187 INFO L513 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1] [2021-11-03 04:46:52,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-03 04:46:52,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:52,409 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:46:52,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:46:52,409 INFO L85 PathProgramCache]: Analyzing trace with hash 163509559, now seen corresponding path program 4 times [2021-11-03 04:46:52,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:46:52,409 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244640439] [2021-11-03 04:46:52,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:46:52,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:46:52,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:53,222 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:53,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:46:53,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244640439] [2021-11-03 04:46:53,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [244640439] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:46:53,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206343799] [2021-11-03 04:46:53,223 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:46:53,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:46:53,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:46:53,227 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:46:53,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-03 04:46:53,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:46:53,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-03 04:46:53,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:46:54,855 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:54,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:46:59,977 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:46:59,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206343799] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:46:59,978 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1645791234] [2021-11-03 04:46:59,979 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-03 04:46:59,979 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:46:59,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:46:59,980 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:46:59,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:46:59,989 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:59,990 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:59,990 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:59,991 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:46:59,992 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:46:59,992 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:46:59,993 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:46:59,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:46:59,999 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_16|], 21=[|v_#valid_17|]} [2021-11-03 04:47:00,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:47:00,028 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:00,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:47:00,029 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:00,029 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:47:00,029 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:47:00,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,033 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:00,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:00,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:47:00,051 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:00,057 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:47:00,058 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:00,058 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:47:00,058 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:47:00,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,061 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:00,062 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:00,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:47:00,063 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:47:00,064 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:47:00,067 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:00,069 INFO L185 QuantifierPusher]: treesize reduction 10, result has 91.2 percent of original size 104 [2021-11-03 04:47:00,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,109 INFO L180 QuantifierPusher]: treesize reduction 10, result has 96.6 percent of original size [2021-11-03 04:47:00,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-03 04:47:00,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:00,160 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:47:00,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:47:00,169 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:47:00,575 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:47:00,575 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:47:00,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2021-11-03 04:47:00,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503830160] [2021-11-03 04:47:00,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-03 04:47:00,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:47:00,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-03 04:47:00,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2021-11-03 04:47:00,580 INFO L87 Difference]: Start difference. First operand 56 states and 72 transitions. Second operand has 64 states, 64 states have (on average 1.09375) internal successors, (70), 64 states have internal predecessors, (70), 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) [2021-11-03 04:47:01,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:47:01,163 INFO L93 Difference]: Finished difference Result 137 states and 184 transitions. [2021-11-03 04:47:01,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-03 04:47:01,164 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.09375) internal successors, (70), 64 states have internal predecessors, (70), 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 36 [2021-11-03 04:47:01,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:47:01,165 INFO L225 Difference]: With dead ends: 137 [2021-11-03 04:47:01,165 INFO L226 Difference]: Without dead ends: 87 [2021-11-03 04:47:01,167 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 43 SyntacticMatches, 30 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2021-11-03 04:47:01,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-03 04:47:01,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 72. [2021-11-03 04:47:01,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 70 states have (on average 1.2571428571428571) internal successors, (88), 71 states have internal predecessors, (88), 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) [2021-11-03 04:47:01,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 88 transitions. [2021-11-03 04:47:01,179 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 88 transitions. Word has length 36 [2021-11-03 04:47:01,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:47:01,179 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 88 transitions. [2021-11-03 04:47:01,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.09375) internal successors, (70), 64 states have internal predecessors, (70), 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) [2021-11-03 04:47:01,180 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 88 transitions. [2021-11-03 04:47:01,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-03 04:47:01,181 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:47:01,182 INFO L513 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1] [2021-11-03 04:47:01,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-03 04:47:01,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:47:01,395 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:47:01,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:47:01,396 INFO L85 PathProgramCache]: Analyzing trace with hash -632841915, now seen corresponding path program 5 times [2021-11-03 04:47:01,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:47:01,396 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442849552] [2021-11-03 04:47:01,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:47:01,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:47:01,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:47:02,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:47:02,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:47:02,972 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442849552] [2021-11-03 04:47:02,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442849552] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:47:02,972 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924212511] [2021-11-03 04:47:02,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:47:02,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:47:02,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:47:02,982 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:47:02,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-03 04:47:16,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-03 04:47:16,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:47:16,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-03 04:47:16,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:47:18,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:47:18,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:47:28,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:47:28,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924212511] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:47:28,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1309378362] [2021-11-03 04:47:28,605 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-03 04:47:28,605 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:47:28,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:47:28,606 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:47:28,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:47:28,617 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,618 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:47:28,618 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:47:28,619 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:47:28,620 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:47:28,622 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:47:28,625 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_17|], 21=[|v_#valid_18|]} [2021-11-03 04:47:28,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:47:28,634 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,635 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:47:28,636 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,636 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:47:28,636 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:47:28,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,639 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:47:28,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:47:28,660 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,662 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:47:28,664 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,665 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:47:28,665 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:47:28,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,669 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,670 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,671 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:47:28,671 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:47:28,672 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:47:28,676 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,679 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-03 04:47:28,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,723 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:47:28,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-03 04:47:28,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:47:28,781 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:47:28,783 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:47:28,788 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:47:29,289 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:47:29,289 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:47:29,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2021-11-03 04:47:29,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125675632] [2021-11-03 04:47:29,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-03 04:47:29,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:47:29,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-03 04:47:29,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4483, Invalid=5617, Unknown=0, NotChecked=0, Total=10100 [2021-11-03 04:47:29,295 INFO L87 Difference]: Start difference. First operand 72 states and 88 transitions. Second operand has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 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) [2021-11-03 04:47:37,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:47:37,679 INFO L93 Difference]: Finished difference Result 249 states and 296 transitions. [2021-11-03 04:47:37,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-03 04:47:37,680 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 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 [2021-11-03 04:47:37,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:47:37,682 INFO L225 Difference]: With dead ends: 249 [2021-11-03 04:47:37,682 INFO L226 Difference]: Without dead ends: 231 [2021-11-03 04:47:37,690 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 56 SyntacticMatches, 45 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9158 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=13407, Invalid=23649, Unknown=0, NotChecked=0, Total=37056 [2021-11-03 04:47:37,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-03 04:47:37,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 104. [2021-11-03 04:47:37,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 102 states have (on average 1.3333333333333333) internal successors, (136), 103 states have internal predecessors, (136), 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) [2021-11-03 04:47:37,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 136 transitions. [2021-11-03 04:47:37,709 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 136 transitions. Word has length 51 [2021-11-03 04:47:37,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:47:37,710 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 136 transitions. [2021-11-03 04:47:37,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 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) [2021-11-03 04:47:37,710 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 136 transitions. [2021-11-03 04:47:37,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-03 04:47:37,712 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:47:37,713 INFO L513 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1, 1, 1] [2021-11-03 04:47:37,735 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-03 04:47:37,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-11-03 04:47:37,920 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:47:37,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:47:37,921 INFO L85 PathProgramCache]: Analyzing trace with hash 1225017655, now seen corresponding path program 5 times [2021-11-03 04:47:37,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:47:37,921 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079985701] [2021-11-03 04:47:37,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:47:37,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:47:38,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:47:40,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:47:40,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:47:40,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079985701] [2021-11-03 04:47:40,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079985701] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:47:40,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832066802] [2021-11-03 04:47:40,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:47:40,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:47:40,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:47:40,095 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:47:40,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-03 04:48:03,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-03 04:48:03,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:48:03,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-03 04:48:03,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:48:06,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:48:06,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:48:23,510 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:48:23,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832066802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:48:23,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [361086290] [2021-11-03 04:48:23,512 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-03 04:48:23,512 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:48:23,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:48:23,512 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:48:23,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:48:23,516 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,517 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:48:23,517 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:48:23,517 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:48:23,518 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,518 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:48:23,519 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:48:23,521 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_18|], 21=[|v_#valid_19|]} [2021-11-03 04:48:23,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:48:23,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:48:23,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:48:23,529 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:48:23,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,531 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:48:23,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:48:23,543 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:48:23,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:48:23,546 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:48:23,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,550 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:48:23,551 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:48:23,551 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:48:23,553 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:48:23,562 INFO L185 QuantifierPusher]: treesize reduction 6, result has 94.5 percent of original size 104 [2021-11-03 04:48:23,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,612 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.9 percent of original size [2021-11-03 04:48:23,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-03 04:48:23,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:48:23,665 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:48:23,668 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:48:23,679 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:48:24,219 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:48:24,219 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:48:24,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2021-11-03 04:48:24,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502581450] [2021-11-03 04:48:24,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2021-11-03 04:48:24,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:48:24,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-11-03 04:48:24,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2021-11-03 04:48:24,226 INFO L87 Difference]: Start difference. First operand 104 states and 136 transitions. Second operand has 128 states, 128 states have (on average 1.046875) internal successors, (134), 128 states have internal predecessors, (134), 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) [2021-11-03 04:48:25,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:48:25,856 INFO L93 Difference]: Finished difference Result 265 states and 360 transitions. [2021-11-03 04:48:25,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-03 04:48:25,857 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.046875) internal successors, (134), 128 states have internal predecessors, (134), 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 68 [2021-11-03 04:48:25,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:48:25,859 INFO L225 Difference]: With dead ends: 265 [2021-11-03 04:48:25,859 INFO L226 Difference]: Without dead ends: 167 [2021-11-03 04:48:25,861 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 75 SyntacticMatches, 62 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2826 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2021-11-03 04:48:25,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-03 04:48:25,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 136. [2021-11-03 04:48:25,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 134 states have (on average 1.2537313432835822) internal successors, (168), 135 states have internal predecessors, (168), 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) [2021-11-03 04:48:25,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 168 transitions. [2021-11-03 04:48:25,882 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 168 transitions. Word has length 68 [2021-11-03 04:48:25,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:48:25,882 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 168 transitions. [2021-11-03 04:48:25,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.046875) internal successors, (134), 128 states have internal predecessors, (134), 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) [2021-11-03 04:48:25,883 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 168 transitions. [2021-11-03 04:48:25,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-03 04:48:25,887 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:48:25,887 INFO L513 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1] [2021-11-03 04:48:25,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-03 04:48:26,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2021-11-03 04:48:26,095 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:48:26,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:48:26,095 INFO L85 PathProgramCache]: Analyzing trace with hash 1245829957, now seen corresponding path program 6 times [2021-11-03 04:48:26,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:48:26,095 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34936599] [2021-11-03 04:48:26,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:48:26,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:48:26,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:48:30,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:48:30,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:48:30,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34936599] [2021-11-03 04:48:30,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34936599] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:48:30,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724989863] [2021-11-03 04:48:30,476 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:48:30,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:48:30,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:48:30,477 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:48:30,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-03 04:48:32,309 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:48:32,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:48:32,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 191 conjunts are in the unsatisfiable core [2021-11-03 04:48:32,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:48:37,934 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:48:37,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:49:10,560 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:49:10,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724989863] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:49:10,560 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071252284] [2021-11-03 04:49:10,561 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-03 04:49:10,561 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:49:10,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:49:10,562 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:49:10,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:49:10,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,565 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:49:10,566 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:49:10,566 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:49:10,567 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,567 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:49:10,568 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:49:10,569 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_19|], 21=[|v_#valid_20|]} [2021-11-03 04:49:10,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:49:10,576 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,577 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:49:10,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:49:10,578 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:49:10,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,580 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:49:10,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:49:10,592 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,594 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:49:10,594 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,594 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:49:10,595 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:49:10,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,609 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,612 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:49:10,613 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:49:10,613 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:49:10,615 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-03 04:49:10,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,649 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:49:10,656 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-03 04:49:10,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:49:10,714 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:49:10,716 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:49:10,721 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:49:11,409 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:49:11,410 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:49:11,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2021-11-03 04:49:11,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035159630] [2021-11-03 04:49:11,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-03 04:49:11,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:49:11,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-03 04:49:11,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18163, Invalid=20449, Unknown=0, NotChecked=0, Total=38612 [2021-11-03 04:49:11,421 INFO L87 Difference]: Start difference. First operand 136 states and 168 transitions. Second operand has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 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) [2021-11-03 04:49:43,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:49:43,409 INFO L93 Difference]: Finished difference Result 489 states and 584 transitions. [2021-11-03 04:49:43,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2021-11-03 04:49:43,410 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 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 99 [2021-11-03 04:49:43,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:49:43,413 INFO L225 Difference]: With dead ends: 489 [2021-11-03 04:49:43,413 INFO L226 Difference]: Without dead ends: 455 [2021-11-03 04:49:43,420 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 104 SyntacticMatches, 93 SemanticMatches, 383 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36758 ImplicationChecksByTransitivity, 68.8s TimeCoverageRelationStatistics Valid=54447, Invalid=93393, Unknown=0, NotChecked=0, Total=147840 [2021-11-03 04:49:43,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-03 04:49:43,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 200. [2021-11-03 04:49:43,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 198 states have (on average 1.3333333333333333) internal successors, (264), 199 states have internal predecessors, (264), 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) [2021-11-03 04:49:43,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 264 transitions. [2021-11-03 04:49:43,464 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 264 transitions. Word has length 99 [2021-11-03 04:49:43,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:49:43,465 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 264 transitions. [2021-11-03 04:49:43,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 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) [2021-11-03 04:49:43,466 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 264 transitions. [2021-11-03 04:49:43,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-03 04:49:43,469 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:49:43,469 INFO L513 BasicCegarLoop]: trace histogram [126, 1, 1, 1, 1, 1, 1] [2021-11-03 04:49:43,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-03 04:49:43,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:49:43,678 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:49:43,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:49:43,679 INFO L85 PathProgramCache]: Analyzing trace with hash 1755246903, now seen corresponding path program 6 times [2021-11-03 04:49:43,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:49:43,679 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953947578] [2021-11-03 04:49:43,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:49:43,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:49:44,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:49:51,255 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:49:51,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:49:51,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953947578] [2021-11-03 04:49:51,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1953947578] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:49:51,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937400941] [2021-11-03 04:49:51,256 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:49:51,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:49:51,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:49:51,257 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:49:51,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-03 04:49:55,040 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:49:55,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:49:55,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 255 conjunts are in the unsatisfiable core [2021-11-03 04:49:55,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:50:04,715 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:50:04,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:51:07,279 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:51:07,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937400941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:51:07,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [706406250] [2021-11-03 04:51:07,281 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-03 04:51:07,281 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:51:07,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:51:07,282 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:51:07,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:51:07,291 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,292 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:51:07,292 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:51:07,293 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:51:07,293 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:51:07,294 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:51:07,296 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_20|], 21=[|v_#valid_21|]} [2021-11-03 04:51:07,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:51:07,310 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,310 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:51:07,310 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:51:07,311 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:51:07,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,313 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:51:07,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:51:07,325 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,326 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:51:07,327 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:51:07,328 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:51:07,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,330 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,331 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,332 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:51:07,332 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:51:07,332 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:51:07,335 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,337 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 04:51:07,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,373 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:51:07,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-03 04:51:07,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:51:07,420 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:51:07,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:51:07,429 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:51:08,209 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:51:08,209 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:51:08,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 256 [2021-11-03 04:51:08,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890279848] [2021-11-03 04:51:08,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 256 states [2021-11-03 04:51:08,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:51:08,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 256 interpolants. [2021-11-03 04:51:08,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32656, Invalid=35204, Unknown=0, NotChecked=0, Total=67860 [2021-11-03 04:51:08,224 INFO L87 Difference]: Start difference. First operand 200 states and 264 transitions. Second operand has 256 states, 256 states have (on average 1.0234375) internal successors, (262), 256 states have internal predecessors, (262), 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) [2021-11-03 04:51:17,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:51:17,069 INFO L93 Difference]: Finished difference Result 521 states and 712 transitions. [2021-11-03 04:51:17,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 256 states. [2021-11-03 04:51:17,070 INFO L78 Accepts]: Start accepts. Automaton has has 256 states, 256 states have (on average 1.0234375) internal successors, (262), 256 states have internal predecessors, (262), 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 132 [2021-11-03 04:51:17,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:51:17,072 INFO L225 Difference]: With dead ends: 521 [2021-11-03 04:51:17,072 INFO L226 Difference]: Without dead ends: 327 [2021-11-03 04:51:17,078 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 139 SyntacticMatches, 126 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9770 ImplicationChecksByTransitivity, 74.7s TimeCoverageRelationStatistics Valid=32656, Invalid=35204, Unknown=0, NotChecked=0, Total=67860 [2021-11-03 04:51:17,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-11-03 04:51:17,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 264. [2021-11-03 04:51:17,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 262 states have (on average 1.251908396946565) internal successors, (328), 263 states have internal predecessors, (328), 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) [2021-11-03 04:51:17,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 328 transitions. [2021-11-03 04:51:17,106 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 328 transitions. Word has length 132 [2021-11-03 04:51:17,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:51:17,107 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 328 transitions. [2021-11-03 04:51:17,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 256 states, 256 states have (on average 1.0234375) internal successors, (262), 256 states have internal predecessors, (262), 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) [2021-11-03 04:51:17,108 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 328 transitions. [2021-11-03 04:51:17,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-03 04:51:17,111 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:51:17,111 INFO L513 BasicCegarLoop]: trace histogram [190, 1, 1, 1, 1, 1] [2021-11-03 04:51:17,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-03 04:51:17,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable144 [2021-11-03 04:51:17,332 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:51:17,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:51:17,332 INFO L85 PathProgramCache]: Analyzing trace with hash 189947717, now seen corresponding path program 7 times [2021-11-03 04:51:17,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:51:17,332 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615077222] [2021-11-03 04:51:17,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:51:17,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:51:19,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:51:33,309 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:51:33,309 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:51:33,309 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615077222] [2021-11-03 04:51:33,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615077222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:51:33,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880953256] [2021-11-03 04:51:33,310 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:51:33,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:51:33,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:51:33,311 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:51:33,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-03 04:51:43,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:51:43,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 1371 conjuncts, 383 conjunts are in the unsatisfiable core [2021-11-03 04:51:43,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:52:04,035 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:52:04,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:54:17,532 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:54:17,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880953256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:54:17,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [74616407] [2021-11-03 04:54:17,534 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-03 04:54:17,534 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:54:17,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:54:17,535 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:54:17,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:54:17,543 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,543 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:54:17,544 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,544 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:54:17,545 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:54:17,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:54:17,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-03 04:54:17,548 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_21|], 21=[|v_#valid_22|]} [2021-11-03 04:54:17,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-03 04:54:17,557 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,558 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:54:17,558 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,559 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:54:17,559 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:54:17,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:54:17,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-03 04:54:17,579 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:54:17,581 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,582 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 04:54:17,582 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:54:17,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,585 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,586 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:54:17,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:54:17,587 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-03 04:54:17,598 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-03 04:54:17,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,630 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:54:17,637 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-03 04:54:17,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:54:17,680 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-03 04:54:17,682 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-03 04:54:17,687 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:54:18,779 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:54:18,779 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:54:18,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 385 [2021-11-03 04:54:18,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596364173] [2021-11-03 04:54:18,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2021-11-03 04:54:18,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:54:18,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2021-11-03 04:54:18,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73171, Invalid=77761, Unknown=0, NotChecked=0, Total=150932 [2021-11-03 04:54:18,797 INFO L87 Difference]: Start difference. First operand 264 states and 328 transitions. Second operand has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 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) [2021-11-03 04:56:29,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:29,048 INFO L93 Difference]: Finished difference Result 969 states and 1160 transitions. [2021-11-03 04:56:29,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 386 states. [2021-11-03 04:56:29,049 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 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 195 [2021-11-03 04:56:29,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:29,054 INFO L225 Difference]: With dead ends: 969 [2021-11-03 04:56:29,054 INFO L226 Difference]: Without dead ends: 903 [2021-11-03 04:56:29,091 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1156 GetRequests, 200 SyntacticMatches, 189 SemanticMatches, 767 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147255 ImplicationChecksByTransitivity, 281.6s TimeCoverageRelationStatistics Valid=219471, Invalid=371121, Unknown=0, NotChecked=0, Total=590592 [2021-11-03 04:56:29,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 903 states. [2021-11-03 04:56:29,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 903 to 392. [2021-11-03 04:56:29,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 390 states have (on average 1.3333333333333333) internal successors, (520), 391 states have internal predecessors, (520), 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) [2021-11-03 04:56:29,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 520 transitions. [2021-11-03 04:56:29,129 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 520 transitions. Word has length 195 [2021-11-03 04:56:29,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:29,130 INFO L470 AbstractCegarLoop]: Abstraction has 392 states and 520 transitions. [2021-11-03 04:56:29,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 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) [2021-11-03 04:56:29,131 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 520 transitions. [2021-11-03 04:56:29,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-11-03 04:56:29,134 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:29,135 INFO L513 BasicCegarLoop]: trace histogram [254, 1, 1, 1, 1, 1, 1] [2021-11-03 04:56:29,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-03 04:56:29,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable157 [2021-11-03 04:56:29,347 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:29,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:29,347 INFO L85 PathProgramCache]: Analyzing trace with hash 739524919, now seen corresponding path program 7 times [2021-11-03 04:56:29,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:29,347 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446131085] [2021-11-03 04:56:29,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:29,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:31,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:56,583 INFO L134 CoverageAnalysis]: Checked inductivity of 32385 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:56,584 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:56,584 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446131085] [2021-11-03 04:56:56,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446131085] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:56:56,584 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976813013] [2021-11-03 04:56:56,584 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:56:56,584 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:56:56,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:56:56,603 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:56:56,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c5eb0bcd-f36c-41e8-a256-03c3f2b81b3a/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-03 04:57:20,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:57:20,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 1820 conjuncts, 511 conjunts are in the unsatisfiable core [2021-11-03 04:57:20,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:57:55,531 INFO L134 CoverageAnalysis]: Checked inductivity of 32385 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:57:55,531 INFO L328 TraceCheckSpWp]: Computing backward predicates...