./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f57f8b833105028fdf95b78a3cf338388755f00064f1be1e7a158d1da7dbd5a2 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:08:57,090 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:08:57,093 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:08:57,144 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:08:57,145 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:08:57,146 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:08:57,148 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:08:57,150 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:08:57,153 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:08:57,154 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:08:57,155 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:08:57,157 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:08:57,157 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:08:57,159 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:08:57,160 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:08:57,162 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:08:57,167 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:08:57,169 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:08:57,171 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:08:57,177 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:08:57,179 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:08:57,186 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:08:57,188 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:08:57,188 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:08:57,192 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:08:57,193 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:08:57,193 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:08:57,194 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:08:57,195 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:08:57,196 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:08:57,196 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:08:57,197 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:08:57,198 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:08:57,199 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:08:57,200 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:08:57,200 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:08:57,201 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:08:57,201 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:08:57,201 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:08:57,202 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:08:57,203 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:08:57,204 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:08:57,228 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:08:57,229 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:08:57,229 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:08:57,229 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:08:57,230 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:08:57,230 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:08:57,230 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:08:57,230 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:08:57,231 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:08:57,231 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:08:57,231 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:08:57,231 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:08:57,231 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:08:57,232 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:08:57,232 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:08:57,232 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:08:57,232 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:08:57,232 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:08:57,233 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:08:57,233 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:08:57,233 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:08:57,234 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:08:57,234 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:08:57,234 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:08:57,234 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:08:57,234 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:08:57,235 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:08:57,235 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:08:57,235 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:08:57,235 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:08:57,235 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:08:57,239 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:08:57,240 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:08:57,240 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:08:57,240 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:08:57,240 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:08:57,241 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:08:57,242 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:08:57,242 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:08:57,242 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:08:57,242 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:08:57,243 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_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f57f8b833105028fdf95b78a3cf338388755f00064f1be1e7a158d1da7dbd5a2 [2021-11-25 18:08:57,487 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:08:57,511 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:08:57,513 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:08:57,514 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:08:57,515 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:08:57,516 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c [2021-11-25 18:08:57,585 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/data/926b55147/1810327db81348b6a3856c38e99d8100/FLAG8c971e625 [2021-11-25 18:08:58,024 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:08:58,025 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c [2021-11-25 18:08:58,033 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/data/926b55147/1810327db81348b6a3856c38e99d8100/FLAG8c971e625 [2021-11-25 18:08:58,392 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/data/926b55147/1810327db81348b6a3856c38e99d8100 [2021-11-25 18:08:58,395 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:08:58,396 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:08:58,398 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:08:58,398 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:08:58,401 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:08:58,402 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,403 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e3fc4f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58, skipping insertion in model container [2021-11-25 18:08:58,404 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,411 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:08:58,432 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:08:58,641 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_860916ee-2d68-4e83-b50f-7d0f0d90258a/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c[2717,2730] [2021-11-25 18:08:58,645 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:08:58,659 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:08:58,682 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_860916ee-2d68-4e83-b50f-7d0f0d90258a/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c[2717,2730] [2021-11-25 18:08:58,684 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:08:58,697 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:08:58,698 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58 WrapperNode [2021-11-25 18:08:58,698 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:08:58,699 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:08:58,700 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:08:58,700 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:08:58,708 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,715 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,736 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 115 [2021-11-25 18:08:58,737 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:08:58,738 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:08:58,738 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:08:58,738 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:08:58,746 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,746 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,748 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,749 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,755 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,757 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,758 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,761 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:08:58,762 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:08:58,762 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:08:58,762 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:08:58,763 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (1/1) ... [2021-11-25 18:08:58,770 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:08:58,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:58,792 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:08:58,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:08:58,863 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:08:58,863 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:08:58,864 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:08:58,864 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:08:58,960 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:08:58,961 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:08:59,114 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:08:59,130 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:08:59,130 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 18:08:59,133 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:08:59 BoogieIcfgContainer [2021-11-25 18:08:59,133 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:08:59,135 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:08:59,135 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:08:59,153 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:08:59,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:08:58" (1/3) ... [2021-11-25 18:08:59,154 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c0436ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:08:59, skipping insertion in model container [2021-11-25 18:08:59,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:58" (2/3) ... [2021-11-25 18:08:59,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c0436ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:08:59, skipping insertion in model container [2021-11-25 18:08:59,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:08:59" (3/3) ... [2021-11-25 18:08:59,156 INFO L111 eAbstractionObserver]: Analyzing ICFG zonotope_3.c.p+cfa-reducer.c [2021-11-25 18:08:59,161 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:08:59,161 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:08:59,261 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:08:59,268 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:08:59,268 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:08:59,283 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:59,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:08:59,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:59,289 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:59,289 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:59,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:59,295 INFO L85 PathProgramCache]: Analyzing trace with hash 532985016, now seen corresponding path program 1 times [2021-11-25 18:08:59,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:59,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513628204] [2021-11-25 18:08:59,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:59,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:59,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:59,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:08:59,459 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:59,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513628204] [2021-11-25 18:08:59,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513628204] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:59,461 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:08:59,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:08:59,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106411239] [2021-11-25 18:08:59,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:59,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:59,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:59,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:59,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:08:59,498 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:59,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:59,529 INFO L93 Difference]: Finished difference Result 31 states and 42 transitions. [2021-11-25 18:08:59,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:59,533 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 18:08:59,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:59,540 INFO L225 Difference]: With dead ends: 31 [2021-11-25 18:08:59,540 INFO L226 Difference]: Without dead ends: 18 [2021-11-25 18:08:59,543 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:08:59,554 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 8 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:59,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 31 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:08:59,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-25 18:08:59,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 14. [2021-11-25 18:08:59,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:59,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2021-11-25 18:08:59,601 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 7 [2021-11-25 18:08:59,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:59,602 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2021-11-25 18:08:59,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:59,602 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2021-11-25 18:08:59,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 18:08:59,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:59,603 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:59,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:08:59,605 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:59,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:59,611 INFO L85 PathProgramCache]: Analyzing trace with hash -1155032636, now seen corresponding path program 1 times [2021-11-25 18:08:59,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:59,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111573708] [2021-11-25 18:08:59,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:59,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:59,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:59,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:08:59,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:59,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111573708] [2021-11-25 18:08:59,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111573708] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:59,678 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:08:59,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:08:59,678 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880693573] [2021-11-25 18:08:59,678 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:59,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:59,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:59,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:59,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:08:59,681 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:59,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:59,692 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2021-11-25 18:08:59,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:59,693 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 18:08:59,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:59,694 INFO L225 Difference]: With dead ends: 27 [2021-11-25 18:08:59,694 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 18:08:59,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:08:59,696 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:59,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:08:59,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 18:08:59,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-25 18:08:59,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:59,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-25 18:08:59,701 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 11 [2021-11-25 18:08:59,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:59,701 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-25 18:08:59,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:59,701 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-25 18:08:59,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 18:08:59,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:59,702 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:59,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:08:59,703 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:59,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:59,709 INFO L85 PathProgramCache]: Analyzing trace with hash -61253633, now seen corresponding path program 1 times [2021-11-25 18:08:59,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:59,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521560849] [2021-11-25 18:08:59,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:59,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:59,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:59,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:08:59,778 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:59,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521560849] [2021-11-25 18:08:59,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521560849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:59,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242751621] [2021-11-25 18:08:59,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:59,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:59,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:59,781 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:59,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:08:59,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:59,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:08:59,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:59,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:08:59,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:08:59,977 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:08:59,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242751621] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:08:59,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [526060344] [2021-11-25 18:08:59,997 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:08:59,997 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:00,002 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:00,008 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:00,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:01,104 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:01,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [526060344] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:01,790 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:01,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2021-11-25 18:09:01,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075108693] [2021-11-25 18:09:01,793 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:01,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:09:01,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:01,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:09:01,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:09:01,795 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:02,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:02,108 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-11-25 18:09:02,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:09:02,109 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 18:09:02,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:02,110 INFO L225 Difference]: With dead ends: 17 [2021-11-25 18:09:02,110 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 18:09:02,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:09:02,112 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:02,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 17 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:09:02,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 18:09:02,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-25 18:09:02,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:02,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-11-25 18:09:02,118 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-11-25 18:09:02,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:02,118 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-11-25 18:09:02,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:02,119 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-11-25 18:09:02,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 18:09:02,119 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:02,120 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:02,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:02,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:02,348 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:02,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:02,349 INFO L85 PathProgramCache]: Analyzing trace with hash -44242972, now seen corresponding path program 1 times [2021-11-25 18:09:02,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:02,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209472352] [2021-11-25 18:09:02,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:02,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:02,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:02,387 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:02,387 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:02,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209472352] [2021-11-25 18:09:02,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209472352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:02,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143180037] [2021-11-25 18:09:02,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:02,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:02,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:02,390 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:02,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:09:02,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:02,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:09:02,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:02,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:02,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:02,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:02,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143180037] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:02,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [919846431] [2021-11-25 18:09:02,511 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:09:02,511 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:02,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:02,512 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:02,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:03,023 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:03,620 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '331#(and (<= 0.0 |ULTIMATE.start_main_~g__x~0#1|) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~g__x~0#1| 0.0) (<= |ULTIMATE.start_main_~f__x~0#1| 0.0) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (<= (/ 1.0 4.0) |ULTIMATE.start_main_~g__x~1#1|) (<= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|) (= |#NULL.offset| 0) (< 100000 |ULTIMATE.start_main_~main__i~0#1|) (<= 0.0 |ULTIMATE.start_main_~f__x~0#1|) (<= |ULTIMATE.start_main_~f__x~1#1| (/ 3.0 4.0)) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (<= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (<= 0 |#StackHeapBarrier|) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:03,620 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:03,621 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:03,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-25 18:09:03,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449653232] [2021-11-25 18:09:03,621 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:03,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:09:03,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:03,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:09:03,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:09:03,623 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:03,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:03,649 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-11-25 18:09:03,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:09:03,650 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 18:09:03,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:03,651 INFO L225 Difference]: With dead ends: 32 [2021-11-25 18:09:03,651 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 18:09:03,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:09:03,653 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:03,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 30 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:09:03,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 18:09:03,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-25 18:09:03,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:03,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-11-25 18:09:03,660 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 11 [2021-11-25 18:09:03,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:03,661 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-11-25 18:09:03,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:03,662 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-11-25 18:09:03,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 18:09:03,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:03,663 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:03,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:03,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:03,876 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:03,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:03,877 INFO L85 PathProgramCache]: Analyzing trace with hash 1495002297, now seen corresponding path program 2 times [2021-11-25 18:09:03,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:03,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848753803] [2021-11-25 18:09:03,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:03,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:03,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:03,984 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:03,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:03,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848753803] [2021-11-25 18:09:03,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848753803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:03,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834478499] [2021-11-25 18:09:03,985 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:09:03,985 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:03,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:03,996 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:04,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:09:04,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 18:09:04,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:09:04,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:09:04,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:04,137 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:04,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:04,219 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:04,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834478499] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:04,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1058554590] [2021-11-25 18:09:04,222 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:09:04,223 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:04,223 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:04,223 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:04,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:04,691 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:05,406 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '562#(and (<= 0.0 |ULTIMATE.start_main_~g__x~0#1|) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~g__x~0#1| 0.0) (<= |ULTIMATE.start_main_~f__x~0#1| 0.0) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (<= (/ 1.0 4.0) |ULTIMATE.start_main_~g__x~1#1|) (<= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|) (= |#NULL.offset| 0) (< 100000 |ULTIMATE.start_main_~main__i~0#1|) (<= 0.0 |ULTIMATE.start_main_~f__x~0#1|) (<= |ULTIMATE.start_main_~f__x~1#1| (/ 3.0 4.0)) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (<= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (<= 0 |#StackHeapBarrier|) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:05,406 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:05,406 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:05,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-25 18:09:05,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070219581] [2021-11-25 18:09:05,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:05,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 18:09:05,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:05,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 18:09:05,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2021-11-25 18:09:05,408 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:05,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:05,463 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-11-25 18:09:05,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:09:05,465 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-25 18:09:05,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:05,466 INFO L225 Difference]: With dead ends: 56 [2021-11-25 18:09:05,466 INFO L226 Difference]: Without dead ends: 49 [2021-11-25 18:09:05,467 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 48 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2021-11-25 18:09:05,468 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 45 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:05,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 49 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:09:05,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-25 18:09:05,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-25 18:09:05,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:05,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2021-11-25 18:09:05,477 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 23 [2021-11-25 18:09:05,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:05,477 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2021-11-25 18:09:05,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:05,477 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2021-11-25 18:09:05,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 18:09:05,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:05,479 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:05,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:05,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:05,704 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:05,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:05,704 INFO L85 PathProgramCache]: Analyzing trace with hash 429682659, now seen corresponding path program 3 times [2021-11-25 18:09:05,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:05,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915458188] [2021-11-25 18:09:05,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:05,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:05,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:05,898 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:05,898 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:05,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915458188] [2021-11-25 18:09:05,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915458188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:05,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371098125] [2021-11-25 18:09:05,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:09:05,899 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:05,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:05,900 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:05,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:09:06,007 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:09:06,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:09:06,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:09:06,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:06,111 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:06,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:06,387 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:06,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371098125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:06,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [550637944] [2021-11-25 18:09:06,389 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:09:06,390 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:06,390 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:06,390 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:06,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:06,852 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:07,820 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1021#(and (<= 0.0 |ULTIMATE.start_main_~g__x~0#1|) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~g__x~0#1| 0.0) (<= |ULTIMATE.start_main_~f__x~0#1| 0.0) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (<= (/ 1.0 4.0) |ULTIMATE.start_main_~g__x~1#1|) (<= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|) (= |#NULL.offset| 0) (< 100000 |ULTIMATE.start_main_~main__i~0#1|) (<= 0.0 |ULTIMATE.start_main_~f__x~0#1|) (<= |ULTIMATE.start_main_~f__x~1#1| (/ 3.0 4.0)) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (<= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (<= 0 |#StackHeapBarrier|) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:07,820 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:07,820 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:07,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-25 18:09:07,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572005696] [2021-11-25 18:09:07,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:07,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 18:09:07,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:07,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 18:09:07,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2021-11-25 18:09:07,823 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:07,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:07,950 INFO L93 Difference]: Finished difference Result 104 states and 117 transitions. [2021-11-25 18:09:07,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 18:09:07,952 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-25 18:09:07,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:07,953 INFO L225 Difference]: With dead ends: 104 [2021-11-25 18:09:07,953 INFO L226 Difference]: Without dead ends: 97 [2021-11-25 18:09:07,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 102 SyntacticMatches, 21 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2021-11-25 18:09:07,955 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 66 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:07,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 96 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:09:07,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-25 18:09:07,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-11-25 18:09:07,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.0208333333333333) internal successors, (98), 96 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:07,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2021-11-25 18:09:07,990 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 47 [2021-11-25 18:09:07,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:07,991 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2021-11-25 18:09:07,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:07,991 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2021-11-25 18:09:07,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-25 18:09:07,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:07,994 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:08,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:08,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 18:09:08,195 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:08,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:08,195 INFO L85 PathProgramCache]: Analyzing trace with hash -665691081, now seen corresponding path program 4 times [2021-11-25 18:09:08,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:08,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348901818] [2021-11-25 18:09:08,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:08,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:08,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:08,620 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:08,621 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:08,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348901818] [2021-11-25 18:09:08,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1348901818] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:08,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304627288] [2021-11-25 18:09:08,621 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:09:08,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:08,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:08,623 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:08,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:09:08,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:08,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 820 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 18:09:08,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:09,008 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:09,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:09,741 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:09,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304627288] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:09,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735874434] [2021-11-25 18:09:09,744 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:09:09,744 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:09,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:09,745 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:09,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:10,198 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:12,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1936#(and (<= 0.0 |ULTIMATE.start_main_~g__x~0#1|) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~g__x~0#1| 0.0) (<= |ULTIMATE.start_main_~f__x~0#1| 0.0) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (<= (/ 1.0 4.0) |ULTIMATE.start_main_~g__x~1#1|) (<= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|) (= |#NULL.offset| 0) (< 100000 |ULTIMATE.start_main_~main__i~0#1|) (<= 0.0 |ULTIMATE.start_main_~f__x~0#1|) (<= |ULTIMATE.start_main_~f__x~1#1| (/ 3.0 4.0)) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (<= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (<= 0 |#StackHeapBarrier|) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:12,288 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:12,289 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:12,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-25 18:09:12,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921210578] [2021-11-25 18:09:12,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:12,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 18:09:12,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:12,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 18:09:12,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1193, Invalid=1669, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 18:09:12,293 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:12,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:12,545 INFO L93 Difference]: Finished difference Result 200 states and 225 transitions. [2021-11-25 18:09:12,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 18:09:12,546 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-25 18:09:12,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:12,555 INFO L225 Difference]: With dead ends: 200 [2021-11-25 18:09:12,555 INFO L226 Difference]: Without dead ends: 193 [2021-11-25 18:09:12,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 210 SyntacticMatches, 45 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3584 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1193, Invalid=1669, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 18:09:12,559 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 207 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:12,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 142 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:09:12,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-25 18:09:12,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2021-11-25 18:09:12,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.0104166666666667) internal successors, (194), 192 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:12,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2021-11-25 18:09:12,607 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 95 [2021-11-25 18:09:12,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:12,608 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2021-11-25 18:09:12,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:12,609 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2021-11-25 18:09:12,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-11-25 18:09:12,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:12,621 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:12,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:12,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 18:09:12,838 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:12,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:12,838 INFO L85 PathProgramCache]: Analyzing trace with hash 988400863, now seen corresponding path program 5 times [2021-11-25 18:09:12,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:12,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085231675] [2021-11-25 18:09:12,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:12,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:12,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:14,088 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:14,088 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:14,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085231675] [2021-11-25 18:09:14,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085231675] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:14,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488844893] [2021-11-25 18:09:14,089 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:09:14,089 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:14,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:14,094 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:14,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:09:14,470 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-11-25 18:09:14,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:09:14,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 1636 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-25 18:09:14,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:14,883 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:14,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:17,318 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:17,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488844893] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:17,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1614637944] [2021-11-25 18:09:17,320 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:09:17,321 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:17,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:17,321 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:17,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:17,761 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:22,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3763#(and (<= 0.0 |ULTIMATE.start_main_~g__x~0#1|) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~g__x~0#1| 0.0) (<= |ULTIMATE.start_main_~f__x~0#1| 0.0) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (<= (/ 1.0 4.0) |ULTIMATE.start_main_~g__x~1#1|) (<= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|) (= |#NULL.offset| 0) (< 100000 |ULTIMATE.start_main_~main__i~0#1|) (<= 0.0 |ULTIMATE.start_main_~f__x~0#1|) (<= |ULTIMATE.start_main_~f__x~1#1| (/ 3.0 4.0)) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (<= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (<= 0 |#StackHeapBarrier|) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:22,682 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:22,682 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:22,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2021-11-25 18:09:22,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403985953] [2021-11-25 18:09:22,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:22,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-25 18:09:22,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:22,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-25 18:09:22,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4673, Invalid=5629, Unknown=0, NotChecked=0, Total=10302 [2021-11-25 18:09:22,690 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:23,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:23,116 INFO L93 Difference]: Finished difference Result 392 states and 441 transitions. [2021-11-25 18:09:23,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-25 18:09:23,117 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 191 [2021-11-25 18:09:23,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:23,124 INFO L225 Difference]: With dead ends: 392 [2021-11-25 18:09:23,124 INFO L226 Difference]: Without dead ends: 385 [2021-11-25 18:09:23,128 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 619 GetRequests, 426 SyntacticMatches, 93 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14096 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=4673, Invalid=5629, Unknown=0, NotChecked=0, Total=10302 [2021-11-25 18:09:23,130 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 282 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:23,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 233 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:09:23,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-11-25 18:09:23,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 385. [2021-11-25 18:09:23,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 1.0052083333333333) internal successors, (386), 384 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:23,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 386 transitions. [2021-11-25 18:09:23,196 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 386 transitions. Word has length 191 [2021-11-25 18:09:23,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:23,198 INFO L470 AbstractCegarLoop]: Abstraction has 385 states and 386 transitions. [2021-11-25 18:09:23,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:23,198 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 386 transitions. [2021-11-25 18:09:23,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2021-11-25 18:09:23,206 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:23,206 INFO L514 BasicCegarLoop]: trace histogram [94, 94, 94, 94, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:23,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:23,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:23,420 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:23,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:23,420 INFO L85 PathProgramCache]: Analyzing trace with hash 394726959, now seen corresponding path program 6 times [2021-11-25 18:09:23,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:23,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146432591] [2021-11-25 18:09:23,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:23,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:23,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:27,135 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:27,135 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:27,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146432591] [2021-11-25 18:09:27,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146432591] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:27,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389805455] [2021-11-25 18:09:27,136 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:09:27,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:27,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:27,149 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:27,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:09:27,705 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:09:27,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:09:27,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 3268 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-25 18:09:27,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:28,521 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:28,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:37,627 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:37,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389805455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:37,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1026603228] [2021-11-25 18:09:37,630 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:09:37,630 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:37,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:37,630 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:37,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:38,038 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:54,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7414#(and (<= 0.0 |ULTIMATE.start_main_~g__x~0#1|) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~g__x~0#1| 0.0) (<= |ULTIMATE.start_main_~f__x~0#1| 0.0) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (<= (/ 1.0 4.0) |ULTIMATE.start_main_~g__x~1#1|) (<= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|) (= |#NULL.offset| 0) (< 100000 |ULTIMATE.start_main_~main__i~0#1|) (<= 0.0 |ULTIMATE.start_main_~f__x~0#1|) (<= |ULTIMATE.start_main_~f__x~1#1| (/ 3.0 4.0)) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (<= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (<= 0 |#StackHeapBarrier|) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:54,868 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:54,868 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:54,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2021-11-25 18:09:54,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523380424] [2021-11-25 18:09:54,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:54,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-25 18:09:54,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:54,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-25 18:09:54,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18545, Invalid=20461, Unknown=0, NotChecked=0, Total=39006 [2021-11-25 18:09:54,888 INFO L87 Difference]: Start difference. First operand 385 states and 386 transitions. Second operand has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:55,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:55,962 INFO L93 Difference]: Finished difference Result 776 states and 873 transitions. [2021-11-25 18:09:55,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2021-11-25 18:09:55,962 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 383 [2021-11-25 18:09:55,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:55,967 INFO L225 Difference]: With dead ends: 776 [2021-11-25 18:09:55,967 INFO L226 Difference]: Without dead ends: 769 [2021-11-25 18:09:55,971 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 858 SyntacticMatches, 189 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55856 ImplicationChecksByTransitivity, 28.3s TimeCoverageRelationStatistics Valid=18545, Invalid=20461, Unknown=0, NotChecked=0, Total=39006 [2021-11-25 18:09:55,972 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 570 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 570 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:55,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [570 Valid, 425 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:09:55,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2021-11-25 18:09:56,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 769. [2021-11-25 18:09:56,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 769 states, 768 states have (on average 1.0026041666666667) internal successors, (770), 768 states have internal predecessors, (770), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:56,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 769 states to 769 states and 770 transitions. [2021-11-25 18:09:56,035 INFO L78 Accepts]: Start accepts. Automaton has 769 states and 770 transitions. Word has length 383 [2021-11-25 18:09:56,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:56,035 INFO L470 AbstractCegarLoop]: Abstraction has 769 states and 770 transitions. [2021-11-25 18:09:56,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:56,036 INFO L276 IsEmpty]: Start isEmpty. Operand 769 states and 770 transitions. [2021-11-25 18:09:56,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 768 [2021-11-25 18:09:56,058 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:56,059 INFO L514 BasicCegarLoop]: trace histogram [190, 190, 190, 190, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:56,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:56,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:56,288 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:56,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:56,289 INFO L85 PathProgramCache]: Analyzing trace with hash 1148915919, now seen corresponding path program 7 times [2021-11-25 18:09:56,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:56,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713846728] [2021-11-25 18:09:56,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:56,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:56,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:09,088 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:09,088 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:09,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713846728] [2021-11-25 18:10:09,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713846728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:10:09,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764359699] [2021-11-25 18:10:09,089 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:10:09,089 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:09,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:09,112 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:09,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:10:10,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:10,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 6532 conjuncts, 192 conjunts are in the unsatisfiable core [2021-11-25 18:10:10,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:11,486 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:11,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:46,516 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:46,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764359699] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:46,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1446056376] [2021-11-25 18:10:46,519 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:10:46,519 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:10:46,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:10:46,519 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:10:46,520 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:10:46,913 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:11:50,480 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14713#(and (<= 0.0 |ULTIMATE.start_main_~g__x~0#1|) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~g__x~0#1| 0.0) (<= |ULTIMATE.start_main_~f__x~0#1| 0.0) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (<= (/ 1.0 4.0) |ULTIMATE.start_main_~g__x~1#1|) (<= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|) (= |#NULL.offset| 0) (< 100000 |ULTIMATE.start_main_~main__i~0#1|) (<= 0.0 |ULTIMATE.start_main_~f__x~0#1|) (<= |ULTIMATE.start_main_~f__x~1#1| (/ 3.0 4.0)) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (<= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (<= 0 |#StackHeapBarrier|) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:11:50,480 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:11:50,480 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:11:50,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [192, 192, 192] total 384 [2021-11-25 18:11:50,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581528156] [2021-11-25 18:11:50,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:11:50,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2021-11-25 18:11:50,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:11:50,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2021-11-25 18:11:50,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73937, Invalid=77773, Unknown=0, NotChecked=0, Total=151710 [2021-11-25 18:11:50,515 INFO L87 Difference]: Start difference. First operand 769 states and 770 transitions. Second operand has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:56,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:11:56,085 INFO L93 Difference]: Finished difference Result 1544 states and 1737 transitions. [2021-11-25 18:11:56,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2021-11-25 18:11:56,087 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 767 [2021-11-25 18:11:56,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:11:56,096 INFO L225 Difference]: With dead ends: 1544 [2021-11-25 18:11:56,096 INFO L226 Difference]: Without dead ends: 1537 [2021-11-25 18:11:56,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2491 GetRequests, 1722 SyntacticMatches, 381 SemanticMatches, 388 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222320 ImplicationChecksByTransitivity, 108.5s TimeCoverageRelationStatistics Valid=73937, Invalid=77773, Unknown=0, NotChecked=0, Total=151710 [2021-11-25 18:11:56,107 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1719 mSDsluCounter, 792 mSDsCounter, 0 mSdLazyCounter, 772 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1719 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 772 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:11:56,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1719 Valid, 802 Invalid, 969 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 772 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:11:56,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1537 states. [2021-11-25 18:11:56,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1537 to 1537. [2021-11-25 18:11:56,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1537 states, 1536 states have (on average 1.0013020833333333) internal successors, (1538), 1536 states have internal predecessors, (1538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:56,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1537 states to 1537 states and 1538 transitions. [2021-11-25 18:11:56,223 INFO L78 Accepts]: Start accepts. Automaton has 1537 states and 1538 transitions. Word has length 767 [2021-11-25 18:11:56,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:11:56,224 INFO L470 AbstractCegarLoop]: Abstraction has 1537 states and 1538 transitions. [2021-11-25 18:11:56,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:56,226 INFO L276 IsEmpty]: Start isEmpty. Operand 1537 states and 1538 transitions. [2021-11-25 18:11:56,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1536 [2021-11-25 18:11:56,277 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:11:56,278 INFO L514 BasicCegarLoop]: trace histogram [382, 382, 382, 382, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:11:56,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:11:56,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:11:56,484 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:11:56,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:11:56,484 INFO L85 PathProgramCache]: Analyzing trace with hash 491329039, now seen corresponding path program 8 times [2021-11-25 18:11:56,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:11:56,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236045053] [2021-11-25 18:11:56,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:11:56,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:11:57,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:12:46,925 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:12:46,926 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:12:46,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236045053] [2021-11-25 18:12:46,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236045053] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:12:46,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95998350] [2021-11-25 18:12:46,927 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:12:46,927 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:12:46,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:12:46,943 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:12:46,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_860916ee-2d68-4e83-b50f-7d0f0d90258a/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:12:56,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 383 check-sat command(s) [2021-11-25 18:12:56,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:12:56,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 13060 conjuncts, 384 conjunts are in the unsatisfiable core [2021-11-25 18:12:56,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:12:59,530 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:12:59,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:15:25,167 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:15:25,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95998350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:15:25,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1774183664] [2021-11-25 18:15:25,170 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 18:15:25,170 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:15:25,171 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:15:25,171 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:15:25,171 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:15:25,500 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:20:07,608 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29308#(and (<= 0.0 |ULTIMATE.start_main_~g__x~0#1|) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~g__x~0#1| 0.0) (<= |ULTIMATE.start_main_~f__x~0#1| 0.0) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| |ULTIMATE.start_main_~__tmp_9~0#1|) (<= (/ 1.0 4.0) |ULTIMATE.start_main_~g__x~1#1|) (<= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|) (= |#NULL.offset| 0) (< 100000 |ULTIMATE.start_main_~main__i~0#1|) (<= 0.0 |ULTIMATE.start_main_~f__x~0#1|) (<= |ULTIMATE.start_main_~f__x~1#1| (/ 3.0 4.0)) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (<= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (<= 0 |#StackHeapBarrier|) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2021-11-25 18:20:07,608 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:20:07,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:20:07,610 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [384, 384, 384] total 768 [2021-11-25 18:20:07,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187862956] [2021-11-25 18:20:07,610 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:20:07,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 769 states [2021-11-25 18:20:07,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:20:07,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 769 interpolants. [2021-11-25 18:20:07,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295313, Invalid=302989, Unknown=0, NotChecked=0, Total=598302 [2021-11-25 18:20:07,708 INFO L87 Difference]: Start difference. First operand 1537 states and 1538 transitions. Second operand has 769 states, 769 states have (on average 3.9921976592977892) internal successors, (3070), 768 states have internal predecessors, (3070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)