./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_valuebound50.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_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/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_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_valuebound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/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_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/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 a7db00fa220927f51e1e342e06102a5d28a1c61268049ef86f9068e213c9adb5 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:35:24,201 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:35:24,204 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:35:24,265 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:35:24,266 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:35:24,271 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:35:24,274 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:35:24,279 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:35:24,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:35:24,289 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:35:24,290 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:35:24,293 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:35:24,294 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:35:24,297 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:35:24,299 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:35:24,305 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:35:24,307 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:35:24,308 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:35:24,311 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:35:24,321 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:35:24,323 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:35:24,325 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:35:24,328 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:35:24,329 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:35:24,333 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:35:24,333 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:35:24,334 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:35:24,335 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:35:24,336 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:35:24,337 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:35:24,338 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:35:24,339 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:35:24,340 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:35:24,341 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:35:24,342 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:35:24,343 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:35:24,343 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:35:24,344 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:35:24,344 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:35:24,345 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:35:24,346 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:35:24,347 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:35:24,378 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:35:24,378 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:35:24,379 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:35:24,379 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:35:24,380 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:35:24,380 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:35:24,380 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:35:24,381 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:35:24,381 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:35:24,381 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:35:24,382 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:35:24,382 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:35:24,382 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:35:24,383 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:35:24,383 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:35:24,383 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:35:24,383 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:35:24,384 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:35:24,385 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:35:24,385 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:35:24,385 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:35:24,386 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:35:24,386 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:35:24,386 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:35:24,386 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:35:24,387 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:35:24,387 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:35:24,387 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:35:24,388 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:35:24,388 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:35:24,388 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:35:24,389 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:35:24,389 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:35:24,389 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:35:24,390 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:35:24,390 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:35:24,390 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:35:24,390 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:35:24,391 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:35:24,391 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:35:24,391 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:35:24,392 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_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a7db00fa220927f51e1e342e06102a5d28a1c61268049ef86f9068e213c9adb5 [2021-11-25 20:35:24,813 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:35:24,839 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:35:24,842 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:35:24,844 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:35:24,845 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:35:24,846 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_valuebound50.c [2021-11-25 20:35:24,953 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/data/9eac3968c/a4eca94551d24a2f866618f09353f4d6/FLAG953e8d74e [2021-11-25 20:35:25,715 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:35:25,717 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_valuebound50.c [2021-11-25 20:35:25,731 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/data/9eac3968c/a4eca94551d24a2f866618f09353f4d6/FLAG953e8d74e [2021-11-25 20:35:26,020 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/data/9eac3968c/a4eca94551d24a2f866618f09353f4d6 [2021-11-25 20:35:26,024 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:35:26,027 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:35:26,039 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:35:26,040 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:35:26,046 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:35:26,047 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,049 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f536447 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26, skipping insertion in model container [2021-11-25 20:35:26,049 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,062 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:35:26,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:35:26,366 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_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_valuebound50.c[458,471] [2021-11-25 20:35:26,396 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:35:26,408 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:35:26,428 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_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_valuebound50.c[458,471] [2021-11-25 20:35:26,439 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:35:26,458 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:35:26,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26 WrapperNode [2021-11-25 20:35:26,459 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:35:26,461 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:35:26,461 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:35:26,462 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:35:26,473 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,482 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,509 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 36 [2021-11-25 20:35:26,509 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:35:26,511 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:35:26,511 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:35:26,511 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:35:26,523 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,523 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,525 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,526 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,531 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,536 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,538 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,540 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:35:26,542 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:35:26,542 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:35:26,542 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:35:26,546 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (1/1) ... [2021-11-25 20:35:26,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:35:26,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:26,592 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:35:26,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:35:26,661 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:35:26,661 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 20:35:26,662 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 20:35:26,662 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:35:26,662 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:35:26,662 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:35:26,663 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 20:35:26,663 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 20:35:26,754 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:35:26,757 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:35:26,916 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:35:26,946 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:35:26,946 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 20:35:26,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:35:26 BoogieIcfgContainer [2021-11-25 20:35:26,950 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:35:26,952 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:35:26,953 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:35:26,958 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:35:26,958 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:35:26" (1/3) ... [2021-11-25 20:35:26,959 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38a14056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:35:26, skipping insertion in model container [2021-11-25 20:35:26,959 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:35:26" (2/3) ... [2021-11-25 20:35:26,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38a14056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:35:26, skipping insertion in model container [2021-11-25 20:35:26,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:35:26" (3/3) ... [2021-11-25 20:35:26,962 INFO L111 eAbstractionObserver]: Analyzing ICFG ps5-ll_valuebound50.c [2021-11-25 20:35:26,970 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:35:26,971 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:35:27,104 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:35:27,128 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 20:35:27,128 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:35:27,153 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:35:27,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:35:27,161 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:27,172 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:27,173 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:27,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:27,181 INFO L85 PathProgramCache]: Analyzing trace with hash 2113922188, now seen corresponding path program 1 times [2021-11-25 20:35:27,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:27,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470919580] [2021-11-25 20:35:27,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:27,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:27,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:27,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:35:27,572 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:27,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470919580] [2021-11-25 20:35:27,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470919580] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:35:27,575 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:35:27,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:35:27,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23209310] [2021-11-25 20:35:27,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:35:27,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 20:35:27,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:27,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 20:35:27,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 20:35:27,640 INFO L87 Difference]: Start difference. First operand has 19 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 20:35:27,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:27,702 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2021-11-25 20:35:27,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 20:35:27,706 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2021-11-25 20:35:27,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:27,727 INFO L225 Difference]: With dead ends: 32 [2021-11-25 20:35:27,728 INFO L226 Difference]: Without dead ends: 17 [2021-11-25 20:35:27,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 20:35:27,745 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:27,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:35:27,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-25 20:35:27,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-25 20:35:27,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 10 states have internal predecessors, (11), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 20:35:27,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-25 20:35:27,853 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2021-11-25 20:35:27,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:27,855 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-25 20:35:27,856 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 20:35:27,856 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-25 20:35:27,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:35:27,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:27,860 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:27,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:35:27,861 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:27,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:27,869 INFO L85 PathProgramCache]: Analyzing trace with hash 2066763035, now seen corresponding path program 1 times [2021-11-25 20:35:27,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:27,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685656350] [2021-11-25 20:35:27,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:27,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:27,921 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:27,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2095354671] [2021-11-25 20:35:27,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:27,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:27,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:27,940 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:27,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:35:28,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:28,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:35:28,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:28,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:35:28,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:35:28,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:28,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685656350] [2021-11-25 20:35:28,241 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:28,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095354671] [2021-11-25 20:35:28,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095354671] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:35:28,242 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:35:28,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:35:28,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971620757] [2021-11-25 20:35:28,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:35:28,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:35:28,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:28,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:35:28,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:35:28,247 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 20:35:28,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:28,323 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2021-11-25 20:35:28,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:35:28,324 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2021-11-25 20:35:28,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:28,326 INFO L225 Difference]: With dead ends: 28 [2021-11-25 20:35:28,326 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 20:35:28,327 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:35:28,329 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:28,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 56 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:35:28,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 20:35:28,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-25 20:35:28,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:35:28,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-11-25 20:35:28,342 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 13 [2021-11-25 20:35:28,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:28,342 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-11-25 20:35:28,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 20:35:28,343 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-11-25 20:35:28,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 20:35:28,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:28,344 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:28,403 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 20:35:28,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 20:35:28,568 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:28,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:28,569 INFO L85 PathProgramCache]: Analyzing trace with hash 1985624712, now seen corresponding path program 1 times [2021-11-25 20:35:28,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:28,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865363423] [2021-11-25 20:35:28,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:28,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:28,587 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:28,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1799185009] [2021-11-25 20:35:28,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:28,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:28,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:28,589 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:28,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:35:28,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:28,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 20:35:28,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:28,873 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:35:28,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:29,042 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:35:29,043 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:29,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865363423] [2021-11-25 20:35:29,043 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:29,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799185009] [2021-11-25 20:35:29,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799185009] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:29,044 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:35:29,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-25 20:35:29,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046101009] [2021-11-25 20:35:29,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:35:29,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:35:29,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:29,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:35:29,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:35:29,048 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 20:35:29,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:29,219 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-11-25 20:35:29,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:35:29,220 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 20 [2021-11-25 20:35:29,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:29,221 INFO L225 Difference]: With dead ends: 30 [2021-11-25 20:35:29,221 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 20:35:29,222 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:35:29,225 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:29,227 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 46 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:35:29,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 20:35:29,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-25 20:35:29,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 20:35:29,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-11-25 20:35:29,254 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 20 [2021-11-25 20:35:29,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:29,254 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-11-25 20:35:29,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 20:35:29,255 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-11-25 20:35:29,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:35:29,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:29,257 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:29,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:29,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:29,459 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:29,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:29,461 INFO L85 PathProgramCache]: Analyzing trace with hash -1002189902, now seen corresponding path program 1 times [2021-11-25 20:35:29,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:29,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303760014] [2021-11-25 20:35:29,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:29,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:29,494 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:29,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1484146765] [2021-11-25 20:35:29,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:29,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:29,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:29,501 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:29,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:35:29,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:29,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:35:29,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:29,961 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:35:29,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:30,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:30,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303760014] [2021-11-25 20:35:30,256 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:30,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484146765] [2021-11-25 20:35:30,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484146765] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:30,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1255269138] [2021-11-25 20:35:30,287 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 20:35:30,288 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:30,294 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:30,301 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:30,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:31,830 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 20:35:31,842 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2021-11-25 20:35:31,898 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:37,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '572#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:37,559 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:37,560 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:35:37,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-11-25 20:35:37,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795677450] [2021-11-25 20:35:37,560 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:37,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:35:37,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:37,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:35:37,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=356, Unknown=1, NotChecked=0, Total=420 [2021-11-25 20:35:37,563 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-25 20:35:37,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:37,756 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-11-25 20:35:37,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:35:37,760 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 31 [2021-11-25 20:35:37,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:37,762 INFO L225 Difference]: With dead ends: 35 [2021-11-25 20:35:37,762 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 20:35:37,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=73, Invalid=432, Unknown=1, NotChecked=0, Total=506 [2021-11-25 20:35:37,765 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 2 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:37,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 104 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:35:37,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 20:35:37,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-25 20:35:37,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 20:35:37,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-11-25 20:35:37,788 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 31 [2021-11-25 20:35:37,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:37,790 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-11-25 20:35:37,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-25 20:35:37,792 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-11-25 20:35:37,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 20:35:37,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:37,797 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:37,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:38,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:38,011 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:38,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:38,012 INFO L85 PathProgramCache]: Analyzing trace with hash -180873249, now seen corresponding path program 2 times [2021-11-25 20:35:38,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:38,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921277882] [2021-11-25 20:35:38,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:38,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:38,058 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:38,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [11579735] [2021-11-25 20:35:38,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:35:38,059 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:38,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:38,060 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:38,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:35:39,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:35:39,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:35:39,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:35:39,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:39,386 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 20:35:39,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:39,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:39,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921277882] [2021-11-25 20:35:39,822 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:39,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11579735] [2021-11-25 20:35:39,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11579735] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:39,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [915154716] [2021-11-25 20:35:39,827 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 20:35:39,827 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:39,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:39,828 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:39,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:40,874 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 20:35:40,886 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2021-11-25 20:35:40,933 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:42,189 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '858#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:42,189 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:42,189 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:35:42,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-11-25 20:35:42,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361502247] [2021-11-25 20:35:42,190 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:42,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:35:42,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:42,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:35:42,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:35:42,192 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 20:35:42,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:42,373 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-11-25 20:35:42,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:35:42,374 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 38 [2021-11-25 20:35:42,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:42,376 INFO L225 Difference]: With dead ends: 38 [2021-11-25 20:35:42,376 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 20:35:42,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:35:42,378 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 2 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:42,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 136 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:35:42,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 20:35:42,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-25 20:35:42,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 20:35:42,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-11-25 20:35:42,394 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 38 [2021-11-25 20:35:42,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:42,397 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-11-25 20:35:42,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 20:35:42,398 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-11-25 20:35:42,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:35:42,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:42,401 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:42,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:42,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:42,609 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:42,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:42,610 INFO L85 PathProgramCache]: Analyzing trace with hash -1515507950, now seen corresponding path program 3 times [2021-11-25 20:35:42,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:42,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494880301] [2021-11-25 20:35:42,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:42,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:42,636 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:42,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1870686450] [2021-11-25 20:35:42,637 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:35:42,638 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:42,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:42,639 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:42,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:35:42,716 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:35:42,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:35:42,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:35:42,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:43,068 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:35:43,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:43,405 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:43,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494880301] [2021-11-25 20:35:43,405 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:43,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870686450] [2021-11-25 20:35:43,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870686450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:43,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788943561] [2021-11-25 20:35:43,410 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 20:35:43,410 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:43,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:43,411 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:43,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:44,280 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 20:35:44,293 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2021-11-25 20:35:44,338 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:45,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1176#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:45,430 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:45,430 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:35:45,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-11-25 20:35:45,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733823012] [2021-11-25 20:35:45,431 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:45,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:35:45,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:45,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:35:45,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:35:45,434 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-25 20:35:45,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:45,646 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-11-25 20:35:45,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:35:45,647 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 45 [2021-11-25 20:35:45,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:45,649 INFO L225 Difference]: With dead ends: 41 [2021-11-25 20:35:45,649 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 20:35:45,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:35:45,651 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 2 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:45,652 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 172 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:35:45,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 20:35:45,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-25 20:35:45,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 20:35:45,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2021-11-25 20:35:45,663 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 45 [2021-11-25 20:35:45,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:45,664 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2021-11-25 20:35:45,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-25 20:35:45,664 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2021-11-25 20:35:45,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 20:35:45,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:45,667 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:45,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:45,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:45,890 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:45,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:45,891 INFO L85 PathProgramCache]: Analyzing trace with hash 180103295, now seen corresponding path program 4 times [2021-11-25 20:35:45,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:45,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561893879] [2021-11-25 20:35:45,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:45,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:45,913 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:45,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [796687170] [2021-11-25 20:35:45,914 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:35:45,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:45,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:45,916 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:45,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:35:46,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:46,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:35:46,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:47,180 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-25 20:35:47,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:47,430 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:47,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561893879] [2021-11-25 20:35:47,431 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:47,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796687170] [2021-11-25 20:35:47,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796687170] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:47,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888334735] [2021-11-25 20:35:47,435 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 20:35:47,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:47,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:47,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:47,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:48,302 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 20:35:48,320 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2021-11-25 20:35:48,379 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:49,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1526#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:49,491 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:49,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:35:49,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-11-25 20:35:49,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624779273] [2021-11-25 20:35:49,492 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:49,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:35:49,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:49,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:35:49,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:35:49,495 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-25 20:35:49,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:49,752 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2021-11-25 20:35:49,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:35:49,752 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 52 [2021-11-25 20:35:49,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:49,754 INFO L225 Difference]: With dead ends: 44 [2021-11-25 20:35:49,754 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 20:35:49,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:35:49,756 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 2 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:49,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 212 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:35:49,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 20:35:49,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-25 20:35:49,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 10 states have call successors, (10), 4 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 20:35:49,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-11-25 20:35:49,771 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 52 [2021-11-25 20:35:49,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:49,771 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-11-25 20:35:49,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-25 20:35:49,772 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-11-25 20:35:49,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 20:35:49,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:49,774 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:49,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:49,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:35:49,982 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:49,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:49,983 INFO L85 PathProgramCache]: Analyzing trace with hash 321989234, now seen corresponding path program 5 times [2021-11-25 20:35:49,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:49,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [516272976] [2021-11-25 20:35:49,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:49,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:50,003 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:50,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1835770546] [2021-11-25 20:35:50,004 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:35:50,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:50,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:50,007 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:50,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:35:52,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:35:52,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:35:52,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:35:52,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:53,079 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 14 proven. 45 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-25 20:35:53,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:53,398 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:53,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [516272976] [2021-11-25 20:35:53,399 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:53,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835770546] [2021-11-25 20:35:53,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835770546] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:53,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [129399178] [2021-11-25 20:35:53,403 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 20:35:53,403 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:53,404 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:53,404 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:53,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:54,101 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 20:35:54,108 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2021-11-25 20:35:54,135 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:54,798 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1908#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:54,799 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:54,799 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:35:54,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-25 20:35:54,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189068896] [2021-11-25 20:35:54,800 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:54,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 20:35:54,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:54,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 20:35:54,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:35:54,802 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-25 20:35:54,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:54,999 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2021-11-25 20:35:54,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:35:55,000 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 59 [2021-11-25 20:35:55,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:55,001 INFO L225 Difference]: With dead ends: 47 [2021-11-25 20:35:55,001 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 20:35:55,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 109 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:35:55,002 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:55,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 256 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:35:55,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 20:35:55,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-25 20:35:55,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 20:35:55,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2021-11-25 20:35:55,015 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 59 [2021-11-25 20:35:55,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:55,015 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2021-11-25 20:35:55,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-25 20:35:55,016 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2021-11-25 20:35:55,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 20:35:55,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:55,017 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:55,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:55,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 20:35:55,222 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:55,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:55,222 INFO L85 PathProgramCache]: Analyzing trace with hash 151429407, now seen corresponding path program 6 times [2021-11-25 20:35:55,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:55,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010042586] [2021-11-25 20:35:55,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:55,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:55,232 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:55,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [992466360] [2021-11-25 20:35:55,232 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:35:55,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:55,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:55,233 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:55,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:35:55,273 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:35:55,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:35:55,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 20:35:55,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:55,577 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 16 proven. 63 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-25 20:35:55,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:55,753 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:55,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010042586] [2021-11-25 20:35:55,753 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:55,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [992466360] [2021-11-25 20:35:55,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [992466360] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:55,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1311955385] [2021-11-25 20:35:55,756 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 20:35:55,756 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:55,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:55,757 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:55,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:56,286 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 20:35:56,293 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2021-11-25 20:35:56,319 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:57,082 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2322#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:57,082 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:57,083 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:35:57,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-25 20:35:57,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396417368] [2021-11-25 20:35:57,083 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:57,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 20:35:57,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:57,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 20:35:57,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:35:57,085 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-25 20:35:57,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:57,291 INFO L93 Difference]: Finished difference Result 50 states and 59 transitions. [2021-11-25 20:35:57,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:35:57,291 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 66 [2021-11-25 20:35:57,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:57,292 INFO L225 Difference]: With dead ends: 50 [2021-11-25 20:35:57,292 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 20:35:57,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 122 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=88, Invalid=668, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:35:57,293 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 2 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:57,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 304 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:35:57,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 20:35:57,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-25 20:35:57,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 20:35:57,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2021-11-25 20:35:57,303 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 66 [2021-11-25 20:35:57,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:57,304 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2021-11-25 20:35:57,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-25 20:35:57,304 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2021-11-25 20:35:57,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 20:35:57,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:57,306 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:57,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:57,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:57,525 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:57,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:57,525 INFO L85 PathProgramCache]: Analyzing trace with hash -949240366, now seen corresponding path program 7 times [2021-11-25 20:35:57,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:57,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723036899] [2021-11-25 20:35:57,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:57,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:57,534 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:35:57,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1615450129] [2021-11-25 20:35:57,534 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:35:57,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:35:57,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:35:57,536 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:35:57,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:35:59,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:35:59,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 20:35:59,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:35:59,708 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 18 proven. 84 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2021-11-25 20:35:59,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:59,917 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:35:59,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723036899] [2021-11-25 20:35:59,917 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:35:59,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615450129] [2021-11-25 20:35:59,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615450129] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:35:59,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1556089123] [2021-11-25 20:35:59,920 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 20:35:59,920 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:59,920 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:59,921 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:59,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:00,456 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 20:36:00,465 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2021-11-25 20:36:00,491 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:01,191 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2768#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:36:01,191 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:01,191 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:36:01,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-25 20:36:01,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213014137] [2021-11-25 20:36:01,191 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:01,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 20:36:01,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:01,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 20:36:01,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=621, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:36:01,193 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-25 20:36:01,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:01,474 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2021-11-25 20:36:01,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:36:01,474 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 73 [2021-11-25 20:36:01,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:01,475 INFO L225 Difference]: With dead ends: 53 [2021-11-25 20:36:01,476 INFO L226 Difference]: Without dead ends: 47 [2021-11-25 20:36:01,476 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 135 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=91, Invalid=721, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:36:01,477 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 2 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:01,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 356 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:36:01,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-25 20:36:01,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-25 20:36:01,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 20:36:01,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions. [2021-11-25 20:36:01,486 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 73 [2021-11-25 20:36:01,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:01,487 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 56 transitions. [2021-11-25 20:36:01,487 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-25 20:36:01,487 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions. [2021-11-25 20:36:01,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-25 20:36:01,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:01,489 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:01,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:01,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:01,694 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:36:01,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:01,695 INFO L85 PathProgramCache]: Analyzing trace with hash 1086423487, now seen corresponding path program 8 times [2021-11-25 20:36:01,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:01,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503466801] [2021-11-25 20:36:01,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:01,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:01,704 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:36:01,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1393392926] [2021-11-25 20:36:01,704 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:36:01,704 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:01,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:01,712 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:01,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20b5719-5dca-4d7f-a0ad-22b4c6184a44/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process