./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P --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 28cfabe4b70eff8f7baaccb87c67f08c79dbf056ceeb2a0d56109f4b60f10f62 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:18:53,286 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:18:53,288 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:18:53,320 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:18:53,320 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:18:53,322 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:18:53,324 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:18:53,327 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:18:53,329 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:18:53,331 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:18:53,332 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:18:53,334 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:18:53,334 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:18:53,336 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:18:53,338 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:18:53,340 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:18:53,341 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:18:53,342 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:18:53,345 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:18:53,348 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:18:53,350 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:18:53,356 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:18:53,360 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:18:53,361 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:18:53,371 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:18:53,376 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:18:53,376 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:18:53,378 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:18:53,379 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:18:53,381 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:18:53,381 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:18:53,382 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:18:53,384 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:18:53,386 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:18:53,387 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:18:53,388 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:18:53,389 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:18:53,389 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:18:53,389 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:18:53,390 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:18:53,391 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:18:53,392 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:18:53,441 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:18:53,441 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:18:53,442 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:18:53,442 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:18:53,443 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:18:53,449 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:18:53,450 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:18:53,450 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:18:53,450 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:18:53,451 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:18:53,452 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:18:53,452 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:18:53,452 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:18:53,453 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:18:53,453 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:18:53,453 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:18:53,453 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:18:53,454 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:18:53,454 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:18:53,455 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:18:53,455 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:18:53,455 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:18:53,456 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:18:53,456 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:18:53,456 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:18:53,456 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:18:53,458 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:18:53,458 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:18:53,458 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:18:53,459 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:18:53,459 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:18:53,459 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:18:53,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:18:53,460 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:18:53,460 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:18:53,461 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:18:53,461 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:18:53,461 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:18:53,461 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:18:53,461 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:18:53,462 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:18:53,462 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_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 28cfabe4b70eff8f7baaccb87c67f08c79dbf056ceeb2a0d56109f4b60f10f62 [2021-11-21 01:18:53,741 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:18:53,767 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:18:53,770 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:18:53,771 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:18:53,772 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:18:53,773 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound20.c [2021-11-21 01:18:53,874 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/data/01b38ab9d/3d8331c1899e4bf18dae9ad5f5ab52c5/FLAGacc7001c3 [2021-11-21 01:18:54,369 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:18:54,371 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound20.c [2021-11-21 01:18:54,388 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/data/01b38ab9d/3d8331c1899e4bf18dae9ad5f5ab52c5/FLAGacc7001c3 [2021-11-21 01:18:54,728 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/data/01b38ab9d/3d8331c1899e4bf18dae9ad5f5ab52c5 [2021-11-21 01:18:54,730 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:18:54,731 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:18:54,734 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:18:54,734 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:18:54,738 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:18:54,739 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:18:54" (1/1) ... [2021-11-21 01:18:54,740 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73ff18c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:54, skipping insertion in model container [2021-11-21 01:18:54,741 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:18:54" (1/1) ... [2021-11-21 01:18:54,748 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:18:54,762 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:18:54,949 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound20.c[537,550] [2021-11-21 01:18:54,967 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:18:54,976 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:18:54,989 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound20.c[537,550] [2021-11-21 01:18:54,997 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:18:55,010 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:18:55,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55 WrapperNode [2021-11-21 01:18:55,011 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:18:55,012 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:18:55,012 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:18:55,012 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:18:55,020 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,027 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,047 INFO L137 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2021-11-21 01:18:55,048 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:18:55,051 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:18:55,052 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:18:55,052 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:18:55,060 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,060 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,062 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,062 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,066 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,070 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,079 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,087 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:18:55,088 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:18:55,088 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:18:55,088 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:18:55,091 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:18:55,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:55,117 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:18:55,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:18:55,155 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:18:55,155 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:18:55,155 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:18:55,156 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:18:55,156 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 01:18:55,156 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 01:18:55,217 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:18:55,219 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:18:55,432 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:18:55,471 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:18:55,471 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:18:55,474 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:18:55 BoogieIcfgContainer [2021-11-21 01:18:55,474 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:18:55,476 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:18:55,476 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:18:55,480 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:18:55,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:18:54" (1/3) ... [2021-11-21 01:18:55,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@596144e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:18:55, skipping insertion in model container [2021-11-21 01:18:55,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (2/3) ... [2021-11-21 01:18:55,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@596144e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:18:55, skipping insertion in model container [2021-11-21 01:18:55,482 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:18:55" (3/3) ... [2021-11-21 01:18:55,483 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound20.c [2021-11-21 01:18:55,488 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:18:55,488 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:18:55,535 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:18:55,542 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 [2021-11-21 01:18:55,543 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:18:55,560 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 01:18:55,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:18:55,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:55,566 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:55,567 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:55,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:55,572 INFO L85 PathProgramCache]: Analyzing trace with hash 151460259, now seen corresponding path program 1 times [2021-11-21 01:18:55,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:55,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043489631] [2021-11-21 01:18:55,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:55,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:55,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:55,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:18:55,839 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:55,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043489631] [2021-11-21 01:18:55,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043489631] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:18:55,843 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:18:55,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:18:55,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238090848] [2021-11-21 01:18:55,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:18:55,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:18:55,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:55,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:18:55,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:18:55,893 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:55,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:55,944 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2021-11-21 01:18:55,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:18:55,947 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 01:18:55,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:55,954 INFO L225 Difference]: With dead ends: 43 [2021-11-21 01:18:55,955 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 01:18:55,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:18:55,964 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:55,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:18:56,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 01:18:56,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-21 01:18:56,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:18:56,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2021-11-21 01:18:56,046 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2021-11-21 01:18:56,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:56,047 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2021-11-21 01:18:56,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:56,047 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2021-11-21 01:18:56,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:18:56,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:56,048 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:56,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:18:56,063 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:56,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:56,068 INFO L85 PathProgramCache]: Analyzing trace with hash -310598151, now seen corresponding path program 1 times [2021-11-21 01:18:56,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:56,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336811343] [2021-11-21 01:18:56,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:56,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:56,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:56,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:18:56,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:56,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336811343] [2021-11-21 01:18:56,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336811343] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:18:56,205 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:18:56,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:18:56,205 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438000366] [2021-11-21 01:18:56,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:18:56,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:18:56,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:56,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:18:56,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:18:56,209 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:56,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:56,295 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2021-11-21 01:18:56,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:18:56,296 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 01:18:56,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:56,298 INFO L225 Difference]: With dead ends: 33 [2021-11-21 01:18:56,298 INFO L226 Difference]: Without dead ends: 31 [2021-11-21 01:18:56,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:18:56,305 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:56,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 90 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:18:56,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-21 01:18:56,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2021-11-21 01:18:56,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:18:56,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-21 01:18:56,333 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2021-11-21 01:18:56,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:56,335 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-21 01:18:56,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:56,336 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-21 01:18:56,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 01:18:56,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:56,338 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:56,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:18:56,342 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:56,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:56,345 INFO L85 PathProgramCache]: Analyzing trace with hash -751211152, now seen corresponding path program 1 times [2021-11-21 01:18:56,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:56,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781430441] [2021-11-21 01:18:56,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:56,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:56,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:56,399 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:18:56,400 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:56,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781430441] [2021-11-21 01:18:56,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1781430441] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:18:56,401 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:18:56,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:18:56,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005833629] [2021-11-21 01:18:56,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:18:56,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:18:56,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:56,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:18:56,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:18:56,404 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:56,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:56,443 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-11-21 01:18:56,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:18:56,444 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-21 01:18:56,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:56,446 INFO L225 Difference]: With dead ends: 39 [2021-11-21 01:18:56,446 INFO L226 Difference]: Without dead ends: 26 [2021-11-21 01:18:56,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:18:56,456 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:56,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:18:56,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-21 01:18:56,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-21 01:18:56,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:18:56,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2021-11-21 01:18:56,471 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2021-11-21 01:18:56,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:56,472 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2021-11-21 01:18:56,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:18:56,472 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2021-11-21 01:18:56,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:18:56,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:56,473 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:56,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:18:56,475 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:56,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:56,478 INFO L85 PathProgramCache]: Analyzing trace with hash 1841718534, now seen corresponding path program 1 times [2021-11-21 01:18:56,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:56,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689189546] [2021-11-21 01:18:56,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:56,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:56,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:56,582 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:18:56,582 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:56,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689189546] [2021-11-21 01:18:56,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689189546] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:18:56,583 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:18:56,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:18:56,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650480716] [2021-11-21 01:18:56,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:18:56,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:18:56,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:56,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:18:56,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:18:56,585 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:18:56,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:56,662 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2021-11-21 01:18:56,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:18:56,663 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-21 01:18:56,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:56,666 INFO L225 Difference]: With dead ends: 39 [2021-11-21 01:18:56,666 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:18:56,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:18:56,671 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:56,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 90 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:18:56,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:18:56,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2021-11-21 01:18:56,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:18:56,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2021-11-21 01:18:56,680 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2021-11-21 01:18:56,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:56,680 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2021-11-21 01:18:56,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:18:56,681 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2021-11-21 01:18:56,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:18:56,681 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:56,682 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:56,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:18:56,682 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:56,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:56,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1224204839, now seen corresponding path program 1 times [2021-11-21 01:18:56,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:56,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065505819] [2021-11-21 01:18:56,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:56,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:56,710 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:18:56,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [369817193] [2021-11-21 01:18:56,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:56,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:56,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:56,724 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:18:56,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:18:56,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:56,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:18:56,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:18:56,997 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:18:56,997 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:18:56,998 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:56,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065505819] [2021-11-21 01:18:56,998 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:18:56,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369817193] [2021-11-21 01:18:56,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369817193] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:18:56,999 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:18:56,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:18:57,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018331489] [2021-11-21 01:18:57,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:18:57,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:18:57,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:57,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:18:57,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:18:57,002 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:18:59,084 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:18:59,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:59,304 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-11-21 01:18:59,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:18:59,305 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-11-21 01:18:59,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:59,306 INFO L225 Difference]: With dead ends: 47 [2021-11-21 01:18:59,306 INFO L226 Difference]: Without dead ends: 44 [2021-11-21 01:18:59,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:18:59,308 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 10 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:59,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 99 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 36 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 01:18:59,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-21 01:18:59,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-21 01:18:59,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 28 states have internal predecessors, (34), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:18:59,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-21 01:18:59,318 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 17 [2021-11-21 01:18:59,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:59,319 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-21 01:18:59,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:18:59,319 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-21 01:18:59,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:18:59,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:59,321 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:59,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:18:59,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:59,535 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:59,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:59,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1437524276, now seen corresponding path program 1 times [2021-11-21 01:18:59,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:59,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094088704] [2021-11-21 01:18:59,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:59,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:59,551 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:18:59,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [88283341] [2021-11-21 01:18:59,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:59,551 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:59,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:59,562 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:18:59,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:18:59,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:59,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:18:59,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:18:59,788 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:18:59,788 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:18:59,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:59,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094088704] [2021-11-21 01:18:59,789 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:18:59,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88283341] [2021-11-21 01:18:59,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88283341] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:18:59,789 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:18:59,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:18:59,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277879746] [2021-11-21 01:18:59,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:18:59,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:18:59,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:59,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:18:59,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:18:59,790 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:19:01,846 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:19:01,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:01,848 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2021-11-21 01:19:02,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:19:02,027 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2021-11-21 01:19:02,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:02,028 INFO L225 Difference]: With dead ends: 64 [2021-11-21 01:19:02,028 INFO L226 Difference]: Without dead ends: 57 [2021-11-21 01:19:02,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:19:02,029 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 1 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:02,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 83 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 1 Unknown, 0 Unchecked, 2.0s Time] [2021-11-21 01:19:02,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-21 01:19:02,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-11-21 01:19:02,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 35 states have (on average 1.2) internal successors, (42), 37 states have internal predecessors, (42), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:19:02,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-21 01:19:02,042 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 25 [2021-11-21 01:19:02,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:02,042 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-21 01:19:02,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:19:02,042 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-21 01:19:02,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:19:02,043 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:02,043 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:02,069 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 01:19:02,256 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:19:02,256 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:02,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:02,257 INFO L85 PathProgramCache]: Analyzing trace with hash 1439252154, now seen corresponding path program 1 times [2021-11-21 01:19:02,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:02,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232835208] [2021-11-21 01:19:02,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:02,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:02,267 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:02,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [733589562] [2021-11-21 01:19:02,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:02,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:02,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:02,269 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:02,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:19:02,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:02,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:19:02,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:02,588 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:19:02,589 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:19:02,589 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:02,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232835208] [2021-11-21 01:19:02,589 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:02,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733589562] [2021-11-21 01:19:02,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733589562] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:02,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:19:02,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:19:02,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909050847] [2021-11-21 01:19:02,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:02,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:19:02,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:02,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:19:02,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:02,592 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:19:04,795 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:19:04,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:04,939 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-11-21 01:19:04,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:19:04,940 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2021-11-21 01:19:04,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:04,942 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:19:04,942 INFO L226 Difference]: Without dead ends: 59 [2021-11-21 01:19:04,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:19:04,943 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 10 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:04,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 118 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 43 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 01:19:04,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-21 01:19:04,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-21 01:19:04,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 12 states have call successors, (12), 8 states have call predecessors, (12), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:19:04,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-21 01:19:04,953 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 25 [2021-11-21 01:19:04,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:04,954 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-21 01:19:04,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:19:04,954 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-21 01:19:04,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:19:04,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:04,955 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:04,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:05,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:05,171 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:05,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:05,171 INFO L85 PathProgramCache]: Analyzing trace with hash 964329913, now seen corresponding path program 1 times [2021-11-21 01:19:05,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:05,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200664240] [2021-11-21 01:19:05,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:05,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:05,179 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:05,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [417010200] [2021-11-21 01:19:05,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:05,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:05,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:05,191 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:05,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:19:05,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:05,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:19:05,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:05,347 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:19:05,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:05,494 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:19:05,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:05,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200664240] [2021-11-21 01:19:05,494 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:05,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417010200] [2021-11-21 01:19:05,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417010200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:19:05,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932269202] [2021-11-21 01:19:05,513 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:19:05,513 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:19:05,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:19:05,523 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:19:05,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:19:23,964 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 12 for LOIs [2021-11-21 01:19:24,047 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:19:31,138 WARN L227 SmtUtils]: Spent 7.04s on a formula simplification. DAG size of input: 89 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:19:40,016 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:19:40,016 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:19:40,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-21 01:19:40,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36273800] [2021-11-21 01:19:40,016 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:19:40,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:19:40,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:40,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:19:40,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=354, Unknown=3, NotChecked=0, Total=420 [2021-11-21 01:19:40,018 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:19:42,283 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:19:42,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:42,778 INFO L93 Difference]: Finished difference Result 122 states and 144 transitions. [2021-11-21 01:19:42,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:19:42,779 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 27 [2021-11-21 01:19:42,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:42,780 INFO L225 Difference]: With dead ends: 122 [2021-11-21 01:19:42,780 INFO L226 Difference]: Without dead ends: 109 [2021-11-21 01:19:42,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=83, Invalid=466, Unknown=3, NotChecked=0, Total=552 [2021-11-21 01:19:42,782 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 57 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 25 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:42,782 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 122 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 54 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2021-11-21 01:19:42,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-21 01:19:42,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 104. [2021-11-21 01:19:42,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 67 states have (on average 1.1791044776119404) internal successors, (79), 69 states have internal predecessors, (79), 22 states have call successors, (22), 14 states have call predecessors, (22), 14 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 01:19:42,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 121 transitions. [2021-11-21 01:19:42,797 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 121 transitions. Word has length 27 [2021-11-21 01:19:42,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:42,798 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 121 transitions. [2021-11-21 01:19:42,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:19:42,798 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 121 transitions. [2021-11-21 01:19:42,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-21 01:19:42,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:42,799 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 01:19:42,837 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-21 01:19:43,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:43,027 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:43,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:43,027 INFO L85 PathProgramCache]: Analyzing trace with hash -327624414, now seen corresponding path program 1 times [2021-11-21 01:19:43,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:43,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731373308] [2021-11-21 01:19:43,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:43,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:43,038 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:43,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1518229140] [2021-11-21 01:19:43,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:43,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:43,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:43,039 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:43,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:19:43,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:43,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-21 01:19:43,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:43,504 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:19:43,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:46,585 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:19:46,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:46,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731373308] [2021-11-21 01:19:46,586 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:46,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518229140] [2021-11-21 01:19:46,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518229140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:19:46,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1596598465] [2021-11-21 01:19:46,588 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-21 01:19:46,588 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:19:46,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:19:46,589 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:19:46,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:20:05,446 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 12 for LOIs [2021-11-21 01:20:05,565 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:20:29,636 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:20:29,636 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:20:29,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-11-21 01:20:29,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576198433] [2021-11-21 01:20:29,637 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:20:29,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:20:29,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:20:29,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:20:29,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=343, Unknown=9, NotChecked=0, Total=420 [2021-11-21 01:20:29,639 INFO L87 Difference]: Start difference. First operand 104 states and 121 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-21 01:20:31,432 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:20:33,851 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:20:37,901 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:20:39,944 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:20:40,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:20:40,297 INFO L93 Difference]: Finished difference Result 135 states and 162 transitions. [2021-11-21 01:20:40,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:20:40,297 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 35 [2021-11-21 01:20:40,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:20:40,300 INFO L225 Difference]: With dead ends: 135 [2021-11-21 01:20:40,300 INFO L226 Difference]: Without dead ends: 127 [2021-11-21 01:20:40,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 24.9s TimeCoverageRelationStatistics Valid=83, Invalid=414, Unknown=9, NotChecked=0, Total=506 [2021-11-21 01:20:40,302 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 36 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 25 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:20:40,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 149 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 224 Invalid, 2 Unknown, 0 Unchecked, 10.4s Time] [2021-11-21 01:20:40,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-21 01:20:40,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 121. [2021-11-21 01:20:40,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 78 states have (on average 1.1666666666666667) internal successors, (91), 81 states have internal predecessors, (91), 26 states have call successors, (26), 16 states have call predecessors, (26), 16 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-21 01:20:40,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 141 transitions. [2021-11-21 01:20:40,320 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 141 transitions. Word has length 35 [2021-11-21 01:20:40,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:20:40,321 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 141 transitions. [2021-11-21 01:20:40,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-21 01:20:40,321 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 141 transitions. [2021-11-21 01:20:40,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-21 01:20:40,323 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:20:40,323 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:20:40,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:20:40,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:40,543 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:20:40,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:20:40,543 INFO L85 PathProgramCache]: Analyzing trace with hash -327608898, now seen corresponding path program 1 times [2021-11-21 01:20:40,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:20:40,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573396600] [2021-11-21 01:20:40,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:20:40,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:20:40,567 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:20:40,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1938692073] [2021-11-21 01:20:40,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:20:40,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:40,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:20:40,575 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:20:40,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:20:40,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:20:40,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:20:40,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:20:40,745 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 01:20:40,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:20:40,905 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 01:20:40,905 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:20:40,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573396600] [2021-11-21 01:20:40,906 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:20:40,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938692073] [2021-11-21 01:20:40,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938692073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:20:40,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [601547737] [2021-11-21 01:20:40,909 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-21 01:20:40,909 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:20:40,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:20:40,909 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:20:40,910 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:20:44,151 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 56 for LOIs [2021-11-21 01:20:44,264 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:20:44,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [601547737] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:20:44,956 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:20:44,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 6] total 18 [2021-11-21 01:20:44,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123288322] [2021-11-21 01:20:44,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:20:44,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:20:44,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:20:44,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:20:44,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:20:44,959 INFO L87 Difference]: Start difference. First operand 121 states and 141 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 01:20:47,729 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:20:48,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:20:48,334 INFO L93 Difference]: Finished difference Result 152 states and 179 transitions. [2021-11-21 01:20:48,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:20:48,335 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 38 [2021-11-21 01:20:48,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:20:48,337 INFO L225 Difference]: With dead ends: 152 [2021-11-21 01:20:48,337 INFO L226 Difference]: Without dead ends: 103 [2021-11-21 01:20:48,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 91 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:20:48,340 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:20:48,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 108 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 176 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2021-11-21 01:20:48,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-21 01:20:48,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-21 01:20:48,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 66 states have (on average 1.1515151515151516) internal successors, (76), 69 states have internal predecessors, (76), 22 states have call successors, (22), 14 states have call predecessors, (22), 14 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 01:20:48,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2021-11-21 01:20:48,356 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 38 [2021-11-21 01:20:48,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:20:48,356 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2021-11-21 01:20:48,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 01:20:48,357 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2021-11-21 01:20:48,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 01:20:48,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:20:48,359 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:20:48,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:20:48,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:48,571 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:20:48,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:20:48,571 INFO L85 PathProgramCache]: Analyzing trace with hash 1605911421, now seen corresponding path program 1 times [2021-11-21 01:20:48,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:20:48,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742791781] [2021-11-21 01:20:48,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:20:48,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:20:48,582 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:20:48,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1811485126] [2021-11-21 01:20:48,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:20:48,583 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:48,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:20:48,584 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:20:48,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:20:48,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:20:48,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:20:48,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:20:48,763 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:20:48,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:20:48,884 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:20:48,884 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:20:48,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742791781] [2021-11-21 01:20:48,885 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:20:48,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811485126] [2021-11-21 01:20:48,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811485126] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:20:48,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1629407728] [2021-11-21 01:20:48,887 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:20:48,887 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:20:48,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:20:48,888 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:20:48,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:21:08,923 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 12 for LOIs [2021-11-21 01:21:09,013 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:21:37,165 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:21:37,165 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:21:37,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-21 01:21:37,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927191010] [2021-11-21 01:21:37,166 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:21:37,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:21:37,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:21:37,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:21:37,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=423, Unknown=7, NotChecked=0, Total=506 [2021-11-21 01:21:37,168 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 01:21:39,916 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:21:42,067 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-21 01:21:42,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:21:42,381 INFO L93 Difference]: Finished difference Result 190 states and 223 transitions. [2021-11-21 01:21:42,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:21:42,381 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 43 [2021-11-21 01:21:42,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:21:42,384 INFO L225 Difference]: With dead ends: 190 [2021-11-21 01:21:42,388 INFO L226 Difference]: Without dead ends: 176 [2021-11-21 01:21:42,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 28.3s TimeCoverageRelationStatistics Valid=95, Invalid=548, Unknown=7, NotChecked=0, Total=650 [2021-11-21 01:21:42,390 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 86 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 48 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:21:42,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 231 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 129 Invalid, 2 Unknown, 0 Unchecked, 5.1s Time] [2021-11-21 01:21:42,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-11-21 01:21:42,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 169. [2021-11-21 01:21:42,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 108 states have (on average 1.1481481481481481) internal successors, (124), 114 states have internal predecessors, (124), 38 states have call successors, (38), 22 states have call predecessors, (38), 22 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-21 01:21:42,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 197 transitions. [2021-11-21 01:21:42,409 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 197 transitions. Word has length 43 [2021-11-21 01:21:42,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:21:42,410 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 197 transitions. [2021-11-21 01:21:42,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 01:21:42,411 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 197 transitions. [2021-11-21 01:21:42,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 01:21:42,412 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:21:42,412 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:21:42,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:21:42,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 01:21:42,639 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:21:42,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:21:42,639 INFO L85 PathProgramCache]: Analyzing trace with hash 1607639299, now seen corresponding path program 1 times [2021-11-21 01:21:42,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:21:42,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980031574] [2021-11-21 01:21:42,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:21:42,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:21:42,647 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:21:42,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2123195964] [2021-11-21 01:21:42,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:21:42,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:21:42,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:21:42,654 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:21:42,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:21:42,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:21:42,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-21 01:21:42,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:21:43,061 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:21:43,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:21:44,328 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:21:44,329 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:21:44,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980031574] [2021-11-21 01:21:44,329 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:21:44,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123195964] [2021-11-21 01:21:44,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123195964] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:21:44,329 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:21:44,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 8 [2021-11-21 01:21:44,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598211721] [2021-11-21 01:21:44,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:21:44,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:21:44,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:21:44,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:21:44,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:21:44,331 INFO L87 Difference]: Start difference. First operand 169 states and 197 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:21:46,440 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:21:46,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:21:46,647 INFO L93 Difference]: Finished difference Result 192 states and 225 transitions. [2021-11-21 01:21:46,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:21:46,647 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2021-11-21 01:21:46,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:21:46,649 INFO L225 Difference]: With dead ends: 192 [2021-11-21 01:21:46,649 INFO L226 Difference]: Without dead ends: 190 [2021-11-21 01:21:46,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:21:46,651 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 15 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:21:46,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 94 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 01:21:46,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-21 01:21:46,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 181. [2021-11-21 01:21:46,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 123 states have internal predecessors, (132), 38 states have call successors, (38), 25 states have call predecessors, (38), 25 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-21 01:21:46,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 205 transitions. [2021-11-21 01:21:46,678 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 205 transitions. Word has length 43 [2021-11-21 01:21:46,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:21:46,678 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 205 transitions. [2021-11-21 01:21:46,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:21:46,679 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 205 transitions. [2021-11-21 01:21:46,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-21 01:21:46,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:21:46,684 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:21:46,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:21:46,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:21:46,894 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:21:46,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:21:46,895 INFO L85 PathProgramCache]: Analyzing trace with hash -2003316837, now seen corresponding path program 1 times [2021-11-21 01:21:46,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:21:46,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551543474] [2021-11-21 01:21:46,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:21:46,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:21:46,902 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:21:46,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [372841077] [2021-11-21 01:21:46,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:21:46,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:21:46,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:21:46,903 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:21:46,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d9b78e6-786c-4df9-a0e4-97af5b9d107a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process