./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound5.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_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/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_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/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_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/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 a077c1334c11d8329da2d0c58ca917b2036581fa7e949d1d304e3346ec54a811 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:45:26,117 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:45:26,119 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:45:26,173 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:45:26,174 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:45:26,179 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:45:26,182 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:45:26,186 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:45:26,189 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:45:26,200 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:45:26,201 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:45:26,203 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:45:26,204 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:45:26,207 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:45:26,209 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:45:26,215 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:45:26,216 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:45:26,217 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:45:26,220 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:45:26,227 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:45:26,230 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:45:26,232 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:45:26,235 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:45:26,236 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:45:26,242 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:45:26,242 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:45:26,243 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:45:26,245 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:45:26,246 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:45:26,247 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:45:26,248 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:45:26,249 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:45:26,251 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:45:26,253 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:45:26,254 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:45:26,255 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:45:26,256 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:45:26,256 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:45:26,256 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:45:26,257 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:45:26,258 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:45:26,259 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:45:26,310 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:45:26,310 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:45:26,311 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:45:26,311 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:45:26,312 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:45:26,312 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:45:26,313 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:45:26,313 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:45:26,313 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:45:26,313 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:45:26,315 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:45:26,315 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:45:26,315 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:45:26,315 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:45:26,316 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:45:26,316 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:45:26,316 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:45:26,317 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:45:26,318 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:45:26,318 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:45:26,318 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:45:26,318 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:45:26,319 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:45:26,319 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:45:26,319 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:45:26,319 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:45:26,321 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:45:26,321 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:45:26,322 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:45:26,322 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:45:26,322 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:45:26,323 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:45:26,323 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:45:26,323 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:45:26,323 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:45:26,324 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:45:26,324 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:45:26,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:45:26,324 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:45:26,325 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:45:26,325 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:45:26,325 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_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a077c1334c11d8329da2d0c58ca917b2036581fa7e949d1d304e3346ec54a811 [2021-11-20 23:45:26,652 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:45:26,675 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:45:26,678 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:45:26,679 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:45:26,680 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:45:26,681 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound5.c [2021-11-20 23:45:26,755 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/data/7e856e93f/f906623cdfff4ae5a4f0711d0b00d2fc/FLAG277e3712d [2021-11-20 23:45:27,322 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:45:27,323 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound5.c [2021-11-20 23:45:27,332 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/data/7e856e93f/f906623cdfff4ae5a4f0711d0b00d2fc/FLAG277e3712d [2021-11-20 23:45:27,690 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/data/7e856e93f/f906623cdfff4ae5a4f0711d0b00d2fc [2021-11-20 23:45:27,692 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:45:27,694 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:45:27,710 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:45:27,710 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:45:27,714 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:45:27,715 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:45:27" (1/1) ... [2021-11-20 23:45:27,716 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@792a762b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:27, skipping insertion in model container [2021-11-20 23:45:27,717 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:45:27" (1/1) ... [2021-11-20 23:45:27,724 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:45:27,738 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:45:27,965 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_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound5.c[526,539] [2021-11-20 23:45:27,980 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:45:27,989 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:45:28,002 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_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound5.c[526,539] [2021-11-20 23:45:28,008 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:45:28,022 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:45:28,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28 WrapperNode [2021-11-20 23:45:28,023 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:45:28,024 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:45:28,025 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:45:28,025 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:45:28,033 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,039 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,058 INFO L137 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 56 [2021-11-20 23:45:28,059 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:45:28,060 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:45:28,060 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:45:28,060 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:45:28,068 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,069 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,070 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,070 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,074 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,078 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,079 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,081 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:45:28,082 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:45:28,082 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:45:28,082 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:45:28,086 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (1/1) ... [2021-11-20 23:45:28,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:45:28,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:28,131 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:45:28,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:45:28,173 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:45:28,174 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:45:28,174 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:45:28,174 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:45:28,174 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-20 23:45:28,174 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-20 23:45:28,225 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:45:28,227 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:45:28,352 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:45:28,380 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:45:28,380 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 23:45:28,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:45:28 BoogieIcfgContainer [2021-11-20 23:45:28,383 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:45:28,385 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:45:28,385 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:45:28,389 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:45:28,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:45:27" (1/3) ... [2021-11-20 23:45:28,390 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c449d7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:45:28, skipping insertion in model container [2021-11-20 23:45:28,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:45:28" (2/3) ... [2021-11-20 23:45:28,390 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c449d7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:45:28, skipping insertion in model container [2021-11-20 23:45:28,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:45:28" (3/3) ... [2021-11-20 23:45:28,392 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_valuebound5.c [2021-11-20 23:45:28,397 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:45:28,398 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:45:28,448 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:45:28,456 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 [2021-11-20 23:45:28,473 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:45:28,490 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 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) [2021-11-20 23:45:28,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:45:28,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:28,497 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:45:28,497 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:28,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:28,503 INFO L85 PathProgramCache]: Analyzing trace with hash -697525204, now seen corresponding path program 1 times [2021-11-20 23:45:28,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:28,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895502636] [2021-11-20 23:45:28,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:28,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:28,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:28,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:28,839 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:28,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895502636] [2021-11-20 23:45:28,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895502636] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:45:28,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:45:28,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:45:28,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191691379] [2021-11-20 23:45:28,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:45:28,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:45:28,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:28,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:45:28,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:45:28,888 INFO L87 Difference]: Start difference. First operand has 20 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 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 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-20 23:45:29,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:29,033 INFO L93 Difference]: Finished difference Result 51 states and 87 transitions. [2021-11-20 23:45:29,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:45:29,036 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 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 6 [2021-11-20 23:45:29,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:29,050 INFO L225 Difference]: With dead ends: 51 [2021-11-20 23:45:29,050 INFO L226 Difference]: Without dead ends: 28 [2021-11-20 23:45:29,057 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 [2021-11-20 23:45:29,065 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 11 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:29,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 83 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:45:29,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-20 23:45:29,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2021-11-20 23:45:29,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 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) [2021-11-20 23:45:29,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-11-20 23:45:29,137 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 6 [2021-11-20 23:45:29,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:29,138 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-11-20 23:45:29,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-20 23:45:29,139 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-11-20 23:45:29,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:45:29,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:29,141 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:29,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:45:29,143 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:29,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:29,148 INFO L85 PathProgramCache]: Analyzing trace with hash -515229903, now seen corresponding path program 1 times [2021-11-20 23:45:29,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:29,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580218736] [2021-11-20 23:45:29,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:29,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:29,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:29,258 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:29,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:29,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580218736] [2021-11-20 23:45:29,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580218736] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:45:29,261 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:45:29,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:45:29,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108815942] [2021-11-20 23:45:29,261 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:45:29,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:45:29,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:29,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:45:29,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:45:29,265 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-20 23:45:29,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:29,350 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-11-20 23:45:29,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:45:29,352 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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 11 [2021-11-20 23:45:29,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:29,355 INFO L225 Difference]: With dead ends: 34 [2021-11-20 23:45:29,355 INFO L226 Difference]: Without dead ends: 32 [2021-11-20 23:45:29,359 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 [2021-11-20 23:45:29,361 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 8 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:29,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 76 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:45:29,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-20 23:45:29,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2021-11-20 23:45:29,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 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) [2021-11-20 23:45:29,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-11-20 23:45:29,374 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 11 [2021-11-20 23:45:29,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:29,375 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-11-20 23:45:29,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-20 23:45:29,375 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-11-20 23:45:29,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:45:29,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:29,376 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:29,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:45:29,376 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:29,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:29,379 INFO L85 PathProgramCache]: Analyzing trace with hash -1604661492, now seen corresponding path program 1 times [2021-11-20 23:45:29,379 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:29,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421724636] [2021-11-20 23:45:29,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:29,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:29,416 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:45:29,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1206847657] [2021-11-20 23:45:29,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:29,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:29,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:29,419 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:29,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:45:29,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:29,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:45:29,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:29,766 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:45:29,766 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:45:29,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:29,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421724636] [2021-11-20 23:45:29,768 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:45:29,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206847657] [2021-11-20 23:45:29,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206847657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:45:29,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:45:29,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:45:29,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015810008] [2021-11-20 23:45:29,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:45:29,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:45:29,776 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:29,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:45:29,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:45:29,777 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-20 23:45:29,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:29,891 INFO L93 Difference]: Finished difference Result 53 states and 69 transitions. [2021-11-20 23:45:29,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:45:29,892 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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 16 [2021-11-20 23:45:29,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:29,896 INFO L225 Difference]: With dead ends: 53 [2021-11-20 23:45:29,896 INFO L226 Difference]: Without dead ends: 40 [2021-11-20 23:45:29,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:45:29,901 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 8 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:29,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 83 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:45:29,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-20 23:45:29,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-20 23:45:29,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 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) [2021-11-20 23:45:29,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2021-11-20 23:45:29,925 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 16 [2021-11-20 23:45:29,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:29,926 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2021-11-20 23:45:29,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-20 23:45:29,926 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2021-11-20 23:45:29,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:45:29,928 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:29,928 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:29,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:30,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:30,142 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:30,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:30,143 INFO L85 PathProgramCache]: Analyzing trace with hash -462181282, now seen corresponding path program 1 times [2021-11-20 23:45:30,143 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:30,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369430774] [2021-11-20 23:45:30,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:30,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:30,163 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:45:30,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [565909451] [2021-11-20 23:45:30,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:30,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:30,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:30,167 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:30,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:45:30,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:30,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:45:30,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:30,402 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:45:30,402 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:45:30,402 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:30,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369430774] [2021-11-20 23:45:30,403 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:45:30,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [565909451] [2021-11-20 23:45:30,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [565909451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:45:30,406 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:45:30,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:45:30,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211233699] [2021-11-20 23:45:30,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:45:30,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:45:30,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:30,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:45:30,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:45:30,412 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 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) [2021-11-20 23:45:30,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:30,497 INFO L93 Difference]: Finished difference Result 52 states and 65 transitions. [2021-11-20 23:45:30,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:45:30,498 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 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 23 [2021-11-20 23:45:30,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:30,500 INFO L225 Difference]: With dead ends: 52 [2021-11-20 23:45:30,500 INFO L226 Difference]: Without dead ends: 45 [2021-11-20 23:45:30,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:45:30,504 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 7 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:30,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 62 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:45:30,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-20 23:45:30,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-20 23:45:30,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-20 23:45:30,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2021-11-20 23:45:30,528 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 23 [2021-11-20 23:45:30,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:30,528 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2021-11-20 23:45:30,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 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) [2021-11-20 23:45:30,529 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2021-11-20 23:45:30,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 23:45:30,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:30,531 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 23:45:30,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:30,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:30,746 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:30,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:30,746 INFO L85 PathProgramCache]: Analyzing trace with hash 1042343919, now seen corresponding path program 1 times [2021-11-20 23:45:30,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:30,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041215631] [2021-11-20 23:45:30,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:30,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:30,763 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:45:30,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [632389141] [2021-11-20 23:45:30,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:30,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:30,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:30,767 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:30,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:45:30,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:30,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:45:30,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:31,031 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 23:45:31,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:31,176 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-20 23:45:31,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:31,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041215631] [2021-11-20 23:45:31,176 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:45:31,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632389141] [2021-11-20 23:45:31,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632389141] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:31,177 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:45:31,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-20 23:45:31,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421228637] [2021-11-20 23:45:31,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:45:31,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:45:31,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:31,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:45:31,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:45:31,181 INFO L87 Difference]: Start difference. First operand 44 states and 54 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, (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) [2021-11-20 23:45:31,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:31,356 INFO L93 Difference]: Finished difference Result 51 states and 60 transitions. [2021-11-20 23:45:31,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:45:31,357 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, (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 33 [2021-11-20 23:45:31,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:31,358 INFO L225 Difference]: With dead ends: 51 [2021-11-20 23:45:31,358 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 23:45:31,359 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:45:31,359 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 8 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:31,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 70 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:45:31,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 23:45:31,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-11-20 23:45:31,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 30 states have internal predecessors, (32), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-20 23:45:31,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2021-11-20 23:45:31,369 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 33 [2021-11-20 23:45:31,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:31,370 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2021-11-20 23:45:31,370 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, (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) [2021-11-20 23:45:31,370 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2021-11-20 23:45:31,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:45:31,372 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:31,372 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:31,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:31,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:31,586 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:31,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:31,586 INFO L85 PathProgramCache]: Analyzing trace with hash -1731990838, now seen corresponding path program 1 times [2021-11-20 23:45:31,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:31,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107749889] [2021-11-20 23:45:31,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:31,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:31,598 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:45:31,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [237079213] [2021-11-20 23:45:31,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:31,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:31,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:31,613 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:31,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:45:31,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:31,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-20 23:45:31,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:32,319 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 23:45:32,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:34,996 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 23:45:34,997 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:34,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107749889] [2021-11-20 23:45:34,997 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:45:34,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237079213] [2021-11-20 23:45:34,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237079213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:34,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119257538] [2021-11-20 23:45:35,019 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:45:35,019 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:35,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:35,030 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:35,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:00,538 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-20 23:46:00,644 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:01,962 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:01,963 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:46:01,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-11-20 23:46:01,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941415732] [2021-11-20 23:46:01,963 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:01,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 23:46:01,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:01,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 23:46:01,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:46:01,965 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-20 23:46:03,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:03,966 INFO L93 Difference]: Finished difference Result 102 states and 121 transitions. [2021-11-20 23:46:03,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:46:03,967 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 52 [2021-11-20 23:46:03,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:03,969 INFO L225 Difference]: With dead ends: 102 [2021-11-20 23:46:03,969 INFO L226 Difference]: Without dead ends: 90 [2021-11-20 23:46:03,970 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2021-11-20 23:46:03,971 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 24 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:03,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 184 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:46:03,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-20 23:46:03,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 83. [2021-11-20 23:46:03,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.12) internal successors, (56), 53 states have internal predecessors, (56), 21 states have call successors, (21), 11 states have call predecessors, (21), 11 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-20 23:46:03,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 97 transitions. [2021-11-20 23:46:03,988 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 97 transitions. Word has length 52 [2021-11-20 23:46:03,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:03,988 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 97 transitions. [2021-11-20 23:46:03,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-20 23:46:03,989 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 97 transitions. [2021-11-20 23:46:03,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-20 23:46:03,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:03,991 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:04,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:04,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:46:04,206 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:04,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:04,206 INFO L85 PathProgramCache]: Analyzing trace with hash 625517203, now seen corresponding path program 2 times [2021-11-20 23:46:04,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:04,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267922652] [2021-11-20 23:46:04,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:04,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:04,218 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:46:04,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [153266222] [2021-11-20 23:46:04,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:46:04,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:04,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:04,220 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:04,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:46:04,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:46:04,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:04,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-20 23:46:04,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:04,559 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-20 23:46:04,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:05,982 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-20 23:46:05,982 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:05,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267922652] [2021-11-20 23:46:05,983 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:46:05,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153266222] [2021-11-20 23:46:05,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153266222] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:05,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [21699437] [2021-11-20 23:46:05,986 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-20 23:46:05,986 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:05,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:05,986 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:05,987 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:18,118 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-20 23:46:18,228 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:19,096 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:19,096 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:46:19,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-20 23:46:19,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8242283] [2021-11-20 23:46:19,096 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:19,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:46:19,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:19,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:46:19,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:46:19,099 INFO L87 Difference]: Start difference. First operand 83 states and 97 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-20 23:46:20,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:20,814 INFO L93 Difference]: Finished difference Result 112 states and 133 transitions. [2021-11-20 23:46:20,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:46:20,815 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 57 [2021-11-20 23:46:20,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:20,816 INFO L225 Difference]: With dead ends: 112 [2021-11-20 23:46:20,816 INFO L226 Difference]: Without dead ends: 93 [2021-11-20 23:46:20,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 150 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:46:20,818 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 13 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:20,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 145 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:46:20,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-20 23:46:20,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2021-11-20 23:46:20,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 57 states have internal predecessors, (58), 23 states have call successors, (23), 12 states have call predecessors, (23), 12 states have return successors, (21), 19 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-20 23:46:20,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 102 transitions. [2021-11-20 23:46:20,833 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 102 transitions. Word has length 57 [2021-11-20 23:46:20,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:20,834 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 102 transitions. [2021-11-20 23:46:20,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-20 23:46:20,835 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 102 transitions. [2021-11-20 23:46:20,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-20 23:46:20,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:20,836 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:20,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:21,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:21,052 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:21,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:21,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1143375622, now seen corresponding path program 1 times [2021-11-20 23:46:21,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:21,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921385248] [2021-11-20 23:46:21,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:21,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:21,061 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:46:21,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [622752562] [2021-11-20 23:46:21,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:21,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:21,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:21,063 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:21,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:46:21,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:21,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-20 23:46:21,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:21,650 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 66 proven. 11 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-20 23:46:21,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:21,879 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 68 proven. 2 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2021-11-20 23:46:21,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:21,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921385248] [2021-11-20 23:46:21,879 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:46:21,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622752562] [2021-11-20 23:46:21,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622752562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:21,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [364731145] [2021-11-20 23:46:21,882 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:46:21,882 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:21,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:21,882 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:21,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:34,743 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2021-11-20 23:46:34,839 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:35,759 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:35,759 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:46:35,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 17 [2021-11-20 23:46:35,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602683348] [2021-11-20 23:46:35,759 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:35,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-20 23:46:35,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:35,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-20 23:46:35,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=640, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:46:35,762 INFO L87 Difference]: Start difference. First operand 89 states and 102 transitions. Second operand has 17 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-20 23:46:36,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:36,259 INFO L93 Difference]: Finished difference Result 116 states and 132 transitions. [2021-11-20 23:46:36,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:46:36,260 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) Word has length 63 [2021-11-20 23:46:36,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:36,263 INFO L225 Difference]: With dead ends: 116 [2021-11-20 23:46:36,263 INFO L226 Difference]: Without dead ends: 93 [2021-11-20 23:46:36,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 158 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:46:36,265 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 30 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:36,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 171 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:46:36,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-20 23:46:36,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 79. [2021-11-20 23:46:36,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 51 states have internal predecessors, (53), 17 states have call successors, (17), 12 states have call predecessors, (17), 12 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-20 23:46:36,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 86 transitions. [2021-11-20 23:46:36,293 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 86 transitions. Word has length 63 [2021-11-20 23:46:36,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:36,294 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 86 transitions. [2021-11-20 23:46:36,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-20 23:46:36,294 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 86 transitions. [2021-11-20 23:46:36,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-20 23:46:36,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:36,296 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:36,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:36,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:36,501 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:36,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:36,501 INFO L85 PathProgramCache]: Analyzing trace with hash 2113244439, now seen corresponding path program 1 times [2021-11-20 23:46:36,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:36,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415517732] [2021-11-20 23:46:36,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:36,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:36,513 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:46:36,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1633409529] [2021-11-20 23:46:36,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:36,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:36,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:36,514 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:36,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:46:36,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:36,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:46:36,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:36,767 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-11-20 23:46:36,768 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:46:36,768 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:36,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415517732] [2021-11-20 23:46:36,768 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 23:46:36,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633409529] [2021-11-20 23:46:36,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633409529] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:46:36,768 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:46:36,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:46:36,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273975304] [2021-11-20 23:46:36,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:46:36,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:46:36,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:36,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:46:36,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:46:36,770 INFO L87 Difference]: Start difference. First operand 79 states and 86 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:46:36,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:36,831 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2021-11-20 23:46:36,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:46:36,832 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2021-11-20 23:46:36,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:36,833 INFO L225 Difference]: With dead ends: 92 [2021-11-20 23:46:36,833 INFO L226 Difference]: Without dead ends: 80 [2021-11-20 23:46:36,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:46:36,834 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 8 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:36,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 61 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:46:36,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-20 23:46:36,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-11-20 23:46:36,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 50 states have (on average 1.06) internal successors, (53), 51 states have internal predecessors, (53), 17 states have call successors, (17), 12 states have call predecessors, (17), 12 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-20 23:46:36,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2021-11-20 23:46:36,849 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 73 [2021-11-20 23:46:36,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:36,849 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2021-11-20 23:46:36,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 23:46:36,849 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2021-11-20 23:46:36,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-20 23:46:36,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:36,851 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-20 23:46:36,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:37,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:37,070 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:37,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:37,070 INFO L85 PathProgramCache]: Analyzing trace with hash 1175687132, now seen corresponding path program 3 times [2021-11-20 23:46:37,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:37,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538817910] [2021-11-20 23:46:37,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:37,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:37,076 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 23:46:37,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [180192820] [2021-11-20 23:46:37,076 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:46:37,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:37,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:37,077 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:37,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_406e7b30-f8cb-4404-a05b-8ab1b5fd397b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:46:37,148 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:46:37,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:37,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-20 23:46:37,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:04,402 WARN L227 SmtUtils]: Spent 10.37s on a formula simplification. DAG size of input: 56 DAG size of output: 48 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 23:47:32,328 WARN L227 SmtUtils]: Spent 6.59s on a formula simplification. DAG size of input: 47 DAG size of output: 42 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 23:50:06,358 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 101 proven. 74 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2021-11-20 23:50:06,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:57,355 WARN L227 SmtUtils]: Spent 20.59s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 23:54:55,618 WARN L227 SmtUtils]: Spent 5.68s on a formula simplification. DAG size of input: 10 DAG size of output: 1 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-20 23:58:52,377 WARN L227 SmtUtils]: Spent 37.73s on a formula simplification. DAG size of input: 116 DAG size of output: 116 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)