./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/egcd2-ll.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_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/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_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench/egcd2-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/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_b56f756e-339b-4e5c-b14c-9f0d04a74256/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 ed6536c9cb0e4b2be9a327fc4a25c6bfba6e98b1dfb78e314dd25bca8cbdb087 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:48:11,948 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:48:11,952 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:48:12,001 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:48:12,006 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:48:12,010 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:48:12,013 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:48:12,017 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:48:12,019 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:48:12,025 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:48:12,026 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:48:12,027 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:48:12,028 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:48:12,030 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:48:12,033 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:48:12,039 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:48:12,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:48:12,042 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:48:12,047 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:48:12,052 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:48:12,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:48:12,055 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:48:12,058 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:48:12,059 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:48:12,068 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:48:12,071 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:48:12,072 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:48:12,073 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:48:12,074 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:48:12,075 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:48:12,075 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:48:12,076 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:48:12,077 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:48:12,078 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:48:12,079 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:48:12,079 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:48:12,080 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:48:12,080 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:48:12,080 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:48:12,081 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:48:12,081 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:48:12,082 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:48:12,106 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:48:12,107 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:48:12,107 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:48:12,107 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:48:12,108 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:48:12,108 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:48:12,108 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:48:12,109 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:48:12,109 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:48:12,109 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:48:12,109 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:48:12,109 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:48:12,109 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:48:12,110 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:48:12,110 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:48:12,110 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:48:12,110 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:48:12,110 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:48:12,111 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:48:12,111 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:48:12,111 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:48:12,112 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:48:12,112 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:48:12,112 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:48:12,112 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:48:12,112 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:48:12,112 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:48:12,113 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:48:12,113 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:48:12,113 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:48:12,113 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:48:12,113 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:48:12,114 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:48:12,114 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:48:12,114 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:48:12,114 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:48:12,114 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:48:12,114 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:48:12,115 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:48:12,115 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:48:12,115 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:48:12,115 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_b56f756e-339b-4e5c-b14c-9f0d04a74256/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ed6536c9cb0e4b2be9a327fc4a25c6bfba6e98b1dfb78e314dd25bca8cbdb087 [2021-11-25 19:48:12,383 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:48:12,406 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:48:12,409 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:48:12,411 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:48:12,412 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:48:12,413 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench/egcd2-ll.c [2021-11-25 19:48:12,511 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/data/6f809a1e8/afd9b0b0d5f840f0aa47d613cebe3a99/FLAG104c4f9bd [2021-11-25 19:48:12,920 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:48:12,920 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/sv-benchmarks/c/nla-digbench/egcd2-ll.c [2021-11-25 19:48:12,926 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/data/6f809a1e8/afd9b0b0d5f840f0aa47d613cebe3a99/FLAG104c4f9bd [2021-11-25 19:48:13,345 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/data/6f809a1e8/afd9b0b0d5f840f0aa47d613cebe3a99 [2021-11-25 19:48:13,347 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:48:13,349 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:48:13,350 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:48:13,350 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:48:13,357 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:48:13,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,360 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4cb06c9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13, skipping insertion in model container [2021-11-25 19:48:13,363 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,370 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:48:13,387 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:48:13,568 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_b56f756e-339b-4e5c-b14c-9f0d04a74256/sv-benchmarks/c/nla-digbench/egcd2-ll.c[490,503] [2021-11-25 19:48:13,588 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:48:13,595 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:48:13,604 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_b56f756e-339b-4e5c-b14c-9f0d04a74256/sv-benchmarks/c/nla-digbench/egcd2-ll.c[490,503] [2021-11-25 19:48:13,616 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:48:13,627 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:48:13,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13 WrapperNode [2021-11-25 19:48:13,628 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:48:13,629 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:48:13,629 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:48:13,629 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:48:13,634 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,640 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,659 INFO L137 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 75 [2021-11-25 19:48:13,659 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:48:13,660 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:48:13,660 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:48:13,660 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:48:13,668 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,669 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,670 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,671 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,675 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,690 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,694 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,697 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:48:13,706 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:48:13,706 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:48:13,706 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:48:13,714 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (1/1) ... [2021-11-25 19:48:13,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:48:13,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:13,747 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:48:13,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:48:13,788 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:48:13,789 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 19:48:13,789 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 19:48:13,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:48:13,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:48:13,789 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:48:13,789 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 19:48:13,790 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 19:48:13,859 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:48:13,861 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:48:14,039 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:48:14,063 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:48:14,063 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 19:48:14,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:48:14 BoogieIcfgContainer [2021-11-25 19:48:14,069 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:48:14,070 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:48:14,071 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:48:14,074 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:48:14,074 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:48:13" (1/3) ... [2021-11-25 19:48:14,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bf94433 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:48:14, skipping insertion in model container [2021-11-25 19:48:14,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:48:13" (2/3) ... [2021-11-25 19:48:14,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bf94433 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:48:14, skipping insertion in model container [2021-11-25 19:48:14,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:48:14" (3/3) ... [2021-11-25 19:48:14,077 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll.c [2021-11-25 19:48:14,082 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:48:14,082 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:48:14,130 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:48:14,137 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 19:48:14,137 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:48:14,155 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 19:48:14,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 19:48:14,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:14,161 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:14,162 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:14,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:14,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1444820577, now seen corresponding path program 1 times [2021-11-25 19:48:14,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:14,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931515046] [2021-11-25 19:48:14,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:14,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:14,264 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:48:14,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [772201954] [2021-11-25 19:48:14,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:14,265 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:14,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:14,266 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:14,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:48:14,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:14,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 19:48:14,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:14,430 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:48:14,430 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:48:14,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:14,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931515046] [2021-11-25 19:48:14,431 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:48:14,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772201954] [2021-11-25 19:48:14,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772201954] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:48:14,432 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:48:14,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:48:14,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659197530] [2021-11-25 19:48:14,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:14,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 19:48:14,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:14,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 19:48:14,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:48:14,486 INFO L87 Difference]: Start difference. First operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:48:14,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:14,559 INFO L93 Difference]: Finished difference Result 46 states and 73 transitions. [2021-11-25 19:48:14,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 19:48:14,562 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2021-11-25 19:48:14,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:14,573 INFO L225 Difference]: With dead ends: 46 [2021-11-25 19:48:14,574 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 19:48:14,578 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:48:14,588 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:14,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:48:14,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 19:48:14,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-25 19:48:14,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 12 states have (on average 1.25) internal successors, (15), 14 states have internal predecessors, (15), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:48:14,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2021-11-25 19:48:14,625 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 19 [2021-11-25 19:48:14,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:14,627 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2021-11-25 19:48:14,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:48:14,627 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2021-11-25 19:48:14,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 19:48:14,629 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:14,629 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:14,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:14,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 19:48:14,831 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:14,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:14,832 INFO L85 PathProgramCache]: Analyzing trace with hash -599376077, now seen corresponding path program 1 times [2021-11-25 19:48:14,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:14,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412393694] [2021-11-25 19:48:14,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:14,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:14,849 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:48:14,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1179169341] [2021-11-25 19:48:14,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:14,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:14,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:14,851 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:14,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:48:14,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:14,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:48:14,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:15,009 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:48:15,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:48:15,119 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:48:15,119 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:15,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412393694] [2021-11-25 19:48:15,120 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:48:15,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179169341] [2021-11-25 19:48:15,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179169341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:48:15,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [42727720] [2021-11-25 19:48:15,165 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:48:15,165 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:48:15,170 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:48:15,175 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:48:15,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:48:16,329 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:48:16,355 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:48:17,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [42727720] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:48:17,401 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:48:17,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 5] total 13 [2021-11-25 19:48:17,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298029398] [2021-11-25 19:48:17,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:17,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:48:17,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:17,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:48:17,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:48:17,405 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand has 10 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 19:48:17,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:17,629 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2021-11-25 19:48:17,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:48:17,630 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 20 [2021-11-25 19:48:17,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:17,631 INFO L225 Difference]: With dead ends: 35 [2021-11-25 19:48:17,631 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 19:48:17,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:48:17,633 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 17 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:17,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 51 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:48:17,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 19:48:17,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-25 19:48:17,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:48:17,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2021-11-25 19:48:17,645 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 20 [2021-11-25 19:48:17,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:17,646 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2021-11-25 19:48:17,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 19:48:17,646 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2021-11-25 19:48:17,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 19:48:17,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:17,647 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:17,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:17,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:17,848 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:17,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:17,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1396531969, now seen corresponding path program 1 times [2021-11-25 19:48:17,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:17,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181029439] [2021-11-25 19:48:17,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:17,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:17,868 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:48:17,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [838103713] [2021-11-25 19:48:17,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:17,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:17,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:17,872 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:17,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:48:17,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:17,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:48:17,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:18,025 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:48:18,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:48:18,106 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:48:18,106 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:18,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181029439] [2021-11-25 19:48:18,106 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:48:18,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838103713] [2021-11-25 19:48:18,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838103713] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:18,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:48:18,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 19:48:18,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433890521] [2021-11-25 19:48:18,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:18,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:48:18,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:18,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:48:18,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:48:18,109 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:48:18,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:18,199 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-11-25 19:48:18,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:48:18,199 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2021-11-25 19:48:18,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:18,200 INFO L225 Difference]: With dead ends: 33 [2021-11-25 19:48:18,200 INFO L226 Difference]: Without dead ends: 31 [2021-11-25 19:48:18,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:48:18,203 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 6 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:18,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 91 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:48:18,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-25 19:48:18,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-25 19:48:18,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 18 states have internal predecessors, (20), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:48:18,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2021-11-25 19:48:18,214 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 21 [2021-11-25 19:48:18,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:18,215 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2021-11-25 19:48:18,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:48:18,215 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2021-11-25 19:48:18,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 19:48:18,216 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:18,216 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:18,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:18,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:18,444 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:18,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:18,444 INFO L85 PathProgramCache]: Analyzing trace with hash -112873217, now seen corresponding path program 1 times [2021-11-25 19:48:18,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:18,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776249963] [2021-11-25 19:48:18,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:18,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:18,457 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:48:18,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1289817670] [2021-11-25 19:48:18,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:18,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:18,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:18,458 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:18,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:48:18,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:18,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 19:48:18,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:18,692 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:48:18,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:48:18,785 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:48:18,786 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:18,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776249963] [2021-11-25 19:48:18,790 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:48:18,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289817670] [2021-11-25 19:48:18,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289817670] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:18,792 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:48:18,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 19:48:18,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166781727] [2021-11-25 19:48:18,793 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:18,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:48:18,794 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:18,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:48:18,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:48:18,802 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:48:18,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:18,854 INFO L93 Difference]: Finished difference Result 44 states and 56 transitions. [2021-11-25 19:48:18,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:48:18,855 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 26 [2021-11-25 19:48:18,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:18,857 INFO L225 Difference]: With dead ends: 44 [2021-11-25 19:48:18,857 INFO L226 Difference]: Without dead ends: 42 [2021-11-25 19:48:18,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:48:18,868 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 7 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:18,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 118 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:48:18,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-25 19:48:18,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-11-25 19:48:18,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 19:48:18,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 53 transitions. [2021-11-25 19:48:18,899 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 53 transitions. Word has length 26 [2021-11-25 19:48:18,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:18,900 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 53 transitions. [2021-11-25 19:48:18,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:48:18,900 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 53 transitions. [2021-11-25 19:48:18,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 19:48:18,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:18,903 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:18,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:19,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-25 19:48:19,128 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:19,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:19,129 INFO L85 PathProgramCache]: Analyzing trace with hash 665597119, now seen corresponding path program 1 times [2021-11-25 19:48:19,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:19,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063247138] [2021-11-25 19:48:19,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:19,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:19,139 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:48:19,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [565430871] [2021-11-25 19:48:19,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:19,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:19,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:19,148 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:19,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:48:19,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:19,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 19:48:19,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:19,399 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 19:48:19,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:48:19,483 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:48:19,483 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:19,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063247138] [2021-11-25 19:48:19,483 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:48:19,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [565430871] [2021-11-25 19:48:19,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [565430871] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:19,483 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:48:19,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 19:48:19,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322613482] [2021-11-25 19:48:19,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:19,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:48:19,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:19,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:48:19,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:48:19,485 INFO L87 Difference]: Start difference. First operand 41 states and 53 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 19:48:19,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:19,540 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2021-11-25 19:48:19,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:48:19,541 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 31 [2021-11-25 19:48:19,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:19,542 INFO L225 Difference]: With dead ends: 48 [2021-11-25 19:48:19,542 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 19:48:19,542 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:48:19,543 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 7 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:19,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 109 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:48:19,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 19:48:19,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-11-25 19:48:19,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 25 states have (on average 1.16) internal successors, (29), 26 states have internal predecessors, (29), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 19:48:19,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 56 transitions. [2021-11-25 19:48:19,566 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 56 transitions. Word has length 31 [2021-11-25 19:48:19,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:19,567 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 56 transitions. [2021-11-25 19:48:19,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 19:48:19,567 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 56 transitions. [2021-11-25 19:48:19,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 19:48:19,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:19,568 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:19,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:19,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:19,784 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:19,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:19,784 INFO L85 PathProgramCache]: Analyzing trace with hash -610328385, now seen corresponding path program 1 times [2021-11-25 19:48:19,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:19,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120537831] [2021-11-25 19:48:19,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:19,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:19,793 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:48:19,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1070528838] [2021-11-25 19:48:19,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:19,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:19,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:19,797 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:19,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:48:19,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:19,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 19:48:19,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:20,044 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 19:48:20,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:48:20,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:20,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120537831] [2021-11-25 19:48:20,933 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:48:20,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070528838] [2021-11-25 19:48:20,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070528838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:20,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001340201] [2021-11-25 19:48:20,943 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-25 19:48:20,943 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:48:20,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:48:20,944 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:48:20,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:48:22,424 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-25 19:48:22,438 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:48:22,456 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:48:29,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2001340201] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:48:29,679 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:48:29,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7] total 18 [2021-11-25 19:48:29,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620663415] [2021-11-25 19:48:29,680 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:29,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:48:29,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:29,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:48:29,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=292, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:48:29,682 INFO L87 Difference]: Start difference. First operand 45 states and 56 transitions. Second operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 19:48:30,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:30,757 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2021-11-25 19:48:30,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:48:30,758 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 36 [2021-11-25 19:48:30,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:30,759 INFO L225 Difference]: With dead ends: 70 [2021-11-25 19:48:30,759 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 19:48:30,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 47 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=88, Invalid=292, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:48:30,761 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 41 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:30,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 45 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 19:48:30,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 19:48:30,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-11-25 19:48:30,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 38 states have (on average 1.105263157894737) internal successors, (42), 40 states have internal predecessors, (42), 18 states have call successors, (18), 9 states have call predecessors, (18), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-25 19:48:30,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 77 transitions. [2021-11-25 19:48:30,776 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 77 transitions. Word has length 36 [2021-11-25 19:48:30,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:30,776 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 77 transitions. [2021-11-25 19:48:30,776 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 19:48:30,777 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 77 transitions. [2021-11-25 19:48:30,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 19:48:30,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:30,778 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:30,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:30,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:30,988 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:30,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:30,988 INFO L85 PathProgramCache]: Analyzing trace with hash 1276270888, now seen corresponding path program 1 times [2021-11-25 19:48:30,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:30,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683685521] [2021-11-25 19:48:30,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:30,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:30,996 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:48:30,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2838911] [2021-11-25 19:48:30,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:30,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:30,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:31,009 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:31,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:48:31,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:31,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:48:31,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:31,182 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:48:31,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:48:31,302 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:48:31,302 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:31,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683685521] [2021-11-25 19:48:31,302 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:48:31,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2838911] [2021-11-25 19:48:31,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2838911] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:48:31,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1000673119] [2021-11-25 19:48:31,305 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-25 19:48:31,305 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:48:31,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:48:31,306 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:48:31,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:48:45,170 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-25 19:48:45,182 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:48:45,195 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:48:49,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1000673119] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:48:49,499 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:48:49,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7, 7] total 20 [2021-11-25 19:48:49,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582089595] [2021-11-25 19:48:49,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:49,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 19:48:49,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:49,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 19:48:49,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:48:49,501 INFO L87 Difference]: Start difference. First operand 66 states and 77 transitions. Second operand has 15 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-25 19:48:53,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:53,188 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2021-11-25 19:48:53,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:48:53,189 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 45 [2021-11-25 19:48:53,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:53,191 INFO L225 Difference]: With dead ends: 92 [2021-11-25 19:48:53,191 INFO L226 Difference]: Without dead ends: 84 [2021-11-25 19:48:53,191 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 102 SyntacticMatches, 13 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=108, Invalid=312, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:48:53,192 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 25 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:53,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 53 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 19:48:53,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-25 19:48:53,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-11-25 19:48:53,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 50 states have (on average 1.12) internal successors, (56), 51 states have internal predecessors, (56), 22 states have call successors, (22), 11 states have call predecessors, (22), 11 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-25 19:48:53,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 99 transitions. [2021-11-25 19:48:53,210 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 99 transitions. Word has length 45 [2021-11-25 19:48:53,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:53,211 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 99 transitions. [2021-11-25 19:48:53,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-25 19:48:53,211 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 99 transitions. [2021-11-25 19:48:53,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 19:48:53,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:53,213 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:53,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:53,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:53,416 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:53,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:53,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1047826176, now seen corresponding path program 1 times [2021-11-25 19:48:53,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:53,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962260791] [2021-11-25 19:48:53,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:53,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:53,425 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:48:53,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [759140110] [2021-11-25 19:48:53,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:53,426 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:53,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:53,433 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:53,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:48:53,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:53,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:48:53,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:53,686 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-25 19:48:53,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:48:53,848 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-25 19:48:53,848 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:53,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962260791] [2021-11-25 19:48:53,848 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:48:53,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759140110] [2021-11-25 19:48:53,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759140110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:48:53,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [597424987] [2021-11-25 19:48:53,851 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2021-11-25 19:48:53,851 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:48:53,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:48:53,852 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:48:53,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:49:03,967 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2021-11-25 19:49:03,976 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:49:03,992 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:49:07,854 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2501#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:49:07,854 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:49:07,854 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:49:07,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-25 19:49:07,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40965426] [2021-11-25 19:49:07,854 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:49:07,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:49:07,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:49:07,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:49:07,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-25 19:49:07,856 INFO L87 Difference]: Start difference. First operand 84 states and 99 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2021-11-25 19:49:08,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:49:08,063 INFO L93 Difference]: Finished difference Result 95 states and 113 transitions. [2021-11-25 19:49:08,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:49:08,064 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 58 [2021-11-25 19:49:08,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:49:08,067 INFO L225 Difference]: With dead ends: 95 [2021-11-25 19:49:08,067 INFO L226 Difference]: Without dead ends: 93 [2021-11-25 19:49:08,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 140 SyntacticMatches, 10 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2021-11-25 19:49:08,069 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 18 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:49:08,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 93 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:49:08,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-25 19:49:08,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-11-25 19:49:08,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 56 states have internal predecessors, (60), 26 states have call successors, (26), 12 states have call predecessors, (26), 12 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-25 19:49:08,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2021-11-25 19:49:08,090 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 58 [2021-11-25 19:49:08,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:49:08,090 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2021-11-25 19:49:08,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2021-11-25 19:49:08,091 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2021-11-25 19:49:08,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 19:49:08,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:49:08,093 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:49:08,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:49:08,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 19:49:08,312 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:49:08,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:49:08,312 INFO L85 PathProgramCache]: Analyzing trace with hash -568433657, now seen corresponding path program 1 times [2021-11-25 19:49:08,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:49:08,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237704742] [2021-11-25 19:49:08,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:49:08,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:49:08,319 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:49:08,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [257265034] [2021-11-25 19:49:08,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:49:08,319 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:49:08,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:49:08,340 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:49:08,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:49:08,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:49:08,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 19:49:08,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:49:08,926 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2021-11-25 19:49:08,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:49:09,469 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2021-11-25 19:49:09,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:49:09,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237704742] [2021-11-25 19:49:09,470 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:49:09,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257265034] [2021-11-25 19:49:09,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257265034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:49:09,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295811349] [2021-11-25 19:49:09,477 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-25 19:49:09,477 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:49:09,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:49:09,478 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:49:09,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:49:21,846 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2021-11-25 19:49:40,900 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2021-11-25 19:49:40,907 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:49:40,919 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:49:51,192 WARN L227 SmtUtils]: Spent 7.12s on a formula simplification. DAG size of input: 144 DAG size of output: 120 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:50:01,045 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3215#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:50:01,045 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:50:01,045 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:50:01,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2021-11-25 19:50:01,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745638250] [2021-11-25 19:50:01,045 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:50:01,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 19:50:01,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:50:01,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 19:50:01,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1174, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 19:50:01,048 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand has 19 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 18 states have internal predecessors, (33), 11 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) [2021-11-25 19:50:04,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:50:04,775 INFO L93 Difference]: Finished difference Result 157 states and 208 transitions. [2021-11-25 19:50:04,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 19:50:04,775 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 18 states have internal predecessors, (33), 11 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) Word has length 67 [2021-11-25 19:50:04,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:50:04,778 INFO L225 Difference]: With dead ends: 157 [2021-11-25 19:50:04,778 INFO L226 Difference]: Without dead ends: 155 [2021-11-25 19:50:04,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 154 SyntacticMatches, 10 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1103 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=353, Invalid=2617, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 19:50:04,781 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 66 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:50:04,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 256 Invalid, 698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 566 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-11-25 19:50:04,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-25 19:50:04,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 149. [2021-11-25 19:50:04,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 83 states have (on average 1.1686746987951808) internal successors, (97), 87 states have internal predecessors, (97), 51 states have call successors, (51), 14 states have call predecessors, (51), 14 states have return successors, (50), 47 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-25 19:50:04,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 198 transitions. [2021-11-25 19:50:04,825 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 198 transitions. Word has length 67 [2021-11-25 19:50:04,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:50:04,825 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 198 transitions. [2021-11-25 19:50:04,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 18 states have internal predecessors, (33), 11 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) [2021-11-25 19:50:04,826 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 198 transitions. [2021-11-25 19:50:04,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 19:50:04,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:50:04,828 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:50:04,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:50:05,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 19:50:05,044 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:50:05,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:50:05,045 INFO L85 PathProgramCache]: Analyzing trace with hash 189361655, now seen corresponding path program 1 times [2021-11-25 19:50:05,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:50:05,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1595454102] [2021-11-25 19:50:05,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:05,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:50:05,054 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:50:05,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1128306617] [2021-11-25 19:50:05,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:05,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:50:05,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:50:05,057 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:50:05,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:50:05,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:50:05,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:50:05,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:50:05,332 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 37 proven. 9 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-25 19:50:05,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:50:05,516 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-25 19:50:05,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:50:05,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1595454102] [2021-11-25 19:50:05,517 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:50:05,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128306617] [2021-11-25 19:50:05,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128306617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:50:05,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2017524447] [2021-11-25 19:50:05,522 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:50:05,522 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:50:05,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:50:05,523 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:50:05,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:50:22,271 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2021-11-25 19:50:22,277 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:50:22,290 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:50:24,705 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4184#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|))' at error location [2021-11-25 19:50:24,706 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:50:24,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:50:24,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-11-25 19:50:24,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409352876] [2021-11-25 19:50:24,706 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:50:24,707 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:50:24,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:50:24,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:50:24,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2021-11-25 19:50:24,709 INFO L87 Difference]: Start difference. First operand 149 states and 198 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 6 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2021-11-25 19:50:25,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:50:25,060 INFO L93 Difference]: Finished difference Result 175 states and 228 transitions. [2021-11-25 19:50:25,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:50:25,061 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 6 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) Word has length 72 [2021-11-25 19:50:25,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:50:25,063 INFO L225 Difference]: With dead ends: 175 [2021-11-25 19:50:25,063 INFO L226 Difference]: Without dead ends: 169 [2021-11-25 19:50:25,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 176 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 629 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=164, Invalid=1026, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 19:50:25,065 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 34 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:50:25,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 206 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:50:25,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-25 19:50:25,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 159. [2021-11-25 19:50:25,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 92 states have (on average 1.1195652173913044) internal successors, (103), 95 states have internal predecessors, (103), 49 states have call successors, (49), 17 states have call predecessors, (49), 17 states have return successors, (48), 46 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-25 19:50:25,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 200 transitions. [2021-11-25 19:50:25,107 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 200 transitions. Word has length 72 [2021-11-25 19:50:25,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:50:25,107 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 200 transitions. [2021-11-25 19:50:25,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 6 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2021-11-25 19:50:25,108 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 200 transitions. [2021-11-25 19:50:25,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 19:50:25,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:50:25,110 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:50:25,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:50:25,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:50:25,323 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:50:25,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:50:25,323 INFO L85 PathProgramCache]: Analyzing trace with hash -581231213, now seen corresponding path program 1 times [2021-11-25 19:50:25,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:50:25,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402192168] [2021-11-25 19:50:25,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:25,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:50:25,331 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:50:25,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1885245472] [2021-11-25 19:50:25,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:25,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:50:25,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:50:25,333 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:50:25,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:50:25,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:50:25,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-25 19:50:25,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:50:26,226 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 84 proven. 40 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-25 19:50:26,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:50:42,372 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 87 proven. 34 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2021-11-25 19:50:42,373 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:50:42,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402192168] [2021-11-25 19:50:42,373 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:50:42,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885245472] [2021-11-25 19:50:42,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885245472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:50:42,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944048107] [2021-11-25 19:50:42,375 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 19:50:42,375 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:50:42,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:50:42,376 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:50:42,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:50:53,686 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2021-11-25 19:51:10,906 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 59 for LOIs [2021-11-25 19:51:10,913 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:51:10,926 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:51:39,755 WARN L227 SmtUtils]: Spent 17.48s on a formula simplification. DAG size of input: 144 DAG size of output: 120 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:51:53,994 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5238#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:51:53,994 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:51:53,994 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:51:53,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 20 [2021-11-25 19:51:53,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833882080] [2021-11-25 19:51:53,995 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:51:53,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 19:51:53,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:51:53,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 19:51:53,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1127, Unknown=2, NotChecked=0, Total=1332 [2021-11-25 19:51:53,996 INFO L87 Difference]: Start difference. First operand 159 states and 200 transitions. Second operand has 20 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 13 states have call predecessors, (27), 11 states have call successors, (27) [2021-11-25 19:51:57,796 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:52:03,850 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:52:06,094 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 19:52:06,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:06,854 INFO L93 Difference]: Finished difference Result 172 states and 211 transitions. [2021-11-25 19:52:06,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:52:06,854 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 13 states have call predecessors, (27), 11 states have call successors, (27) Word has length 83 [2021-11-25 19:52:06,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:06,858 INFO L225 Difference]: With dead ends: 172 [2021-11-25 19:52:06,858 INFO L226 Difference]: Without dead ends: 170 [2021-11-25 19:52:06,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 195 SyntacticMatches, 17 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 53.1s TimeCoverageRelationStatistics Valid=316, Invalid=1662, Unknown=2, NotChecked=0, Total=1980 [2021-11-25 19:52:06,860 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 68 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 107 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:06,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 239 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 363 Invalid, 2 Unknown, 0 Unchecked, 6.7s Time] [2021-11-25 19:52:06,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-25 19:52:06,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 167. [2021-11-25 19:52:06,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 98 states have (on average 1.1122448979591837) internal successors, (109), 101 states have internal predecessors, (109), 49 states have call successors, (49), 19 states have call predecessors, (49), 19 states have return successors, (48), 46 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-25 19:52:06,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 206 transitions. [2021-11-25 19:52:06,907 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 206 transitions. Word has length 83 [2021-11-25 19:52:06,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:06,908 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 206 transitions. [2021-11-25 19:52:06,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 13 states have call predecessors, (27), 11 states have call successors, (27) [2021-11-25 19:52:06,908 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 206 transitions. [2021-11-25 19:52:06,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-25 19:52:06,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:06,910 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:06,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:07,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:07,116 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:07,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:07,116 INFO L85 PathProgramCache]: Analyzing trace with hash -990146452, now seen corresponding path program 2 times [2021-11-25 19:52:07,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:07,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150389242] [2021-11-25 19:52:07,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:07,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:07,126 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:07,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2025533803] [2021-11-25 19:52:07,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:52:07,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:07,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:07,128 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:07,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 19:52:07,205 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 19:52:07,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:52:07,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 19:52:07,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:07,838 INFO L134 CoverageAnalysis]: Checked inductivity of 436 backedges. 51 proven. 48 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2021-11-25 19:52:07,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:08,073 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:08,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150389242] [2021-11-25 19:52:08,074 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:08,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025533803] [2021-11-25 19:52:08,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025533803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:52:08,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1436972372] [2021-11-25 19:52:08,075 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 19:52:08,075 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:08,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:08,076 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:08,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:24,286 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2021-11-25 19:52:24,314 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:52:24,327 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:52:27,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6200#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 19:52:27,482 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:52:27,482 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:52:27,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-25 19:52:27,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107849217] [2021-11-25 19:52:27,482 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:27,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:52:27,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:52:27,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:52:27,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2021-11-25 19:52:27,484 INFO L87 Difference]: Start difference. First operand 167 states and 206 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 6 states have call predecessors, (18), 7 states have call successors, (18) [2021-11-25 19:52:27,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:27,994 INFO L93 Difference]: Finished difference Result 206 states and 263 transitions. [2021-11-25 19:52:27,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:52:27,994 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 6 states have call predecessors, (18), 7 states have call successors, (18) Word has length 100 [2021-11-25 19:52:27,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:27,996 INFO L225 Difference]: With dead ends: 206 [2021-11-25 19:52:27,996 INFO L226 Difference]: Without dead ends: 204 [2021-11-25 19:52:27,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 186 SyntacticMatches, 19 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 778 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=148, Invalid=974, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:52:27,998 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 21 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:27,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 315 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 487 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:52:27,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-11-25 19:52:28,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2021-11-25 19:52:28,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 115 states have (on average 1.1304347826086956) internal successors, (130), 118 states have internal predecessors, (130), 65 states have call successors, (65), 21 states have call predecessors, (65), 21 states have return successors, (64), 62 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-25 19:52:28,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 259 transitions. [2021-11-25 19:52:28,059 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 259 transitions. Word has length 100 [2021-11-25 19:52:28,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:28,059 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 259 transitions. [2021-11-25 19:52:28,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 6 states have call predecessors, (18), 7 states have call successors, (18) [2021-11-25 19:52:28,060 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 259 transitions. [2021-11-25 19:52:28,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 19:52:28,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:28,062 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:28,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:28,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 19:52:28,272 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:28,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:28,272 INFO L85 PathProgramCache]: Analyzing trace with hash 16404768, now seen corresponding path program 3 times [2021-11-25 19:52:28,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:52:28,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704805604] [2021-11-25 19:52:28,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:28,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:52:28,281 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:52:28,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1040195156] [2021-11-25 19:52:28,282 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:52:28,282 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:28,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:28,283 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:28,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 19:52:28,337 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:52:28,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:52:28,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-25 19:52:28,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:30,191 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 83 proven. 120 refuted. 0 times theorem prover too weak. 238 trivial. 0 not checked. [2021-11-25 19:52:30,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:31,306 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 120 proven. 32 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-11-25 19:52:31,307 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:52:31,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704805604] [2021-11-25 19:52:31,307 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 19:52:31,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040195156] [2021-11-25 19:52:31,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1040195156] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:31,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1545137547] [2021-11-25 19:52:31,309 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 19:52:31,309 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:52:31,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:52:31,310 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:52:31,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:52:42,578 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2021-11-25 19:52:55,507 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 19:52:55,510 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2021-11-25 19:52:55,524 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:53:14,274 WARN L227 SmtUtils]: Spent 16.02s on a formula simplification. DAG size of input: 144 DAG size of output: 119 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:53:22,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7485#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 19:53:22,402 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:53:22,402 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:53:22,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 11] total 25 [2021-11-25 19:53:22,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533645677] [2021-11-25 19:53:22,402 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:53:22,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 19:53:22,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:53:22,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 19:53:22,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1511, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 19:53:22,404 INFO L87 Difference]: Start difference. First operand 202 states and 259 transitions. Second operand has 25 states, 21 states have (on average 2.0) internal successors, (42), 17 states have internal predecessors, (42), 14 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-25 19:53:33,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:53:33,842 INFO L93 Difference]: Finished difference Result 301 states and 378 transitions. [2021-11-25 19:53:33,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 19:53:33,842 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 2.0) internal successors, (42), 17 states have internal predecessors, (42), 14 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) Word has length 103 [2021-11-25 19:53:33,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:53:33,845 INFO L225 Difference]: With dead ends: 301 [2021-11-25 19:53:33,845 INFO L226 Difference]: Without dead ends: 233 [2021-11-25 19:53:33,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 265 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=407, Invalid=2673, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 19:53:33,848 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 74 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 773 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:53:33,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 242 Invalid, 773 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-25 19:53:33,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-25 19:53:33,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 215. [2021-11-25 19:53:33,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 122 states have (on average 1.1147540983606556) internal successors, (136), 124 states have internal predecessors, (136), 69 states have call successors, (69), 24 states have call predecessors, (69), 23 states have return successors, (68), 66 states have call predecessors, (68), 68 states have call successors, (68) [2021-11-25 19:53:33,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 273 transitions. [2021-11-25 19:53:33,919 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 273 transitions. Word has length 103 [2021-11-25 19:53:33,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:53:33,920 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 273 transitions. [2021-11-25 19:53:33,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 21 states have (on average 2.0) internal successors, (42), 17 states have internal predecessors, (42), 14 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-25 19:53:33,921 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 273 transitions. [2021-11-25 19:53:33,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-25 19:53:33,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:53:33,923 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:53:33,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:53:34,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:53:34,136 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:53:34,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:53:34,136 INFO L85 PathProgramCache]: Analyzing trace with hash -130323247, now seen corresponding path program 2 times [2021-11-25 19:53:34,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:53:34,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986534994] [2021-11-25 19:53:34,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:53:34,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:53:34,144 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 19:53:34,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1895935313] [2021-11-25 19:53:34,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:53:34,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:53:34,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:53:34,146 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:53:34,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b56f756e-339b-4e5c-b14c-9f0d04a74256/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 19:53:34,216 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 19:53:34,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:53:34,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-25 19:53:34,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:53:35,322 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 131 proven. 61 refuted. 0 times theorem prover too weak. 375 trivial. 0 not checked. [2021-11-25 19:53:35,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:07,809 WARN L227 SmtUtils]: Spent 12.02s on a formula simplification that was a NOOP. DAG size: 31 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:56:57,950 WARN L860 $PredicateComparison]: unable to prove that (or (and (not (= |c___VERIFIER_assert_#in~cond| 0)) (or (not (= |c___VERIFIER_assert_#in~cond| 1)) (forall ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1037| Int) (|v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_917| Int) (|v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_833| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1049| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_898| Int) (|v_ULTIMATE.start_main_~p~0#1_BEFORE_CALL_827| Int) (|v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_910| Int)) (let ((.cse0 (+ (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1037| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_898| |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_910|) (* |v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_917| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1049| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_898|))) (.cse1 (+ (* |v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_917| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1049|) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1037| |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_910|)))) (or (= .cse0 (+ (* |v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_833| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1049|) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1037| |v_ULTIMATE.start_main_~p~0#1_BEFORE_CALL_827|))) (<= .cse1 0) (= (mod .cse0 .cse1) 0)))))) (= c___VERIFIER_assert_~cond 0)) is different from true [2021-11-25 19:57:24,013 WARN L860 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 1)) (forall ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1037| Int) (|v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_917| Int) (|v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_833| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1049| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_898| Int) (|v_ULTIMATE.start_main_~p~0#1_BEFORE_CALL_827| Int) (|v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_910| Int)) (let ((.cse0 (+ (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1037| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_898| |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_910|) (* |v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_917| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1049| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_898|))) (.cse1 (+ (* |v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_917| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1049|) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1037| |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_910|)))) (or (= .cse0 (+ (* |v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_833| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1049|) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1037| |v_ULTIMATE.start_main_~p~0#1_BEFORE_CALL_827|))) (<= .cse1 0) (= (mod .cse0 .cse1) 0))))) is different from true [2021-11-25 20:00:48,050 WARN L227 SmtUtils]: Spent 6.31s on a formula simplification that was a NOOP. DAG size: 12 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)