./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i --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_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/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_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/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_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/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 f8d14145608efc0a8f321a178564faff63399ecbab28641c0c2971fec318068f --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:31:51,362 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:31:51,365 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:31:51,420 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:31:51,421 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:31:51,426 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:31:51,428 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:31:51,432 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:31:51,435 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:31:51,443 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:31:51,444 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:31:51,446 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:31:51,447 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:31:51,449 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:31:51,452 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:31:51,458 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:31:51,460 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:31:51,461 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:31:51,464 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:31:51,471 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:31:51,474 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:31:51,475 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:31:51,478 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:31:51,479 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:31:51,489 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:31:51,489 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:31:51,490 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:31:51,492 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:31:51,493 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:31:51,494 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:31:51,495 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:31:51,496 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:31:51,498 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:31:51,499 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:31:51,501 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:31:51,501 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:31:51,502 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:31:51,503 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:31:51,503 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:31:51,504 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:31:51,505 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:31:51,506 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:31:51,549 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:31:51,550 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:31:51,550 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:31:51,550 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:31:51,552 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:31:51,552 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:31:51,552 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:31:51,552 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:31:51,553 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:31:51,553 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:31:51,554 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:31:51,554 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:31:51,554 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:31:51,555 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:31:51,555 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:31:51,555 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:31:51,555 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:31:51,556 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:31:51,557 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:31:51,557 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:31:51,557 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:31:51,557 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:31:51,557 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:31:51,558 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:31:51,558 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:31:51,558 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:31:51,558 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:31:51,559 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:31:51,559 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:31:51,559 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:31:51,560 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:31:51,560 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:31:51,560 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:31:51,561 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:31:51,561 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:31:51,561 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:31:51,561 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:31:51,561 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:31:51,562 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:31:51,562 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:31:51,562 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:31:51,562 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_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f8d14145608efc0a8f321a178564faff63399ecbab28641c0c2971fec318068f [2021-11-25 20:31:51,860 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:31:51,895 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:31:51,897 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:31:51,898 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:31:51,899 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:31:51,900 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i [2021-11-25 20:31:51,974 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/data/80ecdc677/355225eef6f14de391fa971e4bbe62cb/FLAGed214983c [2021-11-25 20:31:52,629 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:31:52,630 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i [2021-11-25 20:31:52,659 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/data/80ecdc677/355225eef6f14de391fa971e4bbe62cb/FLAGed214983c [2021-11-25 20:31:52,979 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/data/80ecdc677/355225eef6f14de391fa971e4bbe62cb [2021-11-25 20:31:52,983 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:31:52,984 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:31:52,986 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:31:52,986 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:31:52,989 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:31:52,990 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:31:52" (1/1) ... [2021-11-25 20:31:52,991 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74d450e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:52, skipping insertion in model container [2021-11-25 20:31:52,992 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:31:52" (1/1) ... [2021-11-25 20:31:52,998 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:31:53,039 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:31:53,372 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_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i[22636,22649] [2021-11-25 20:31:53,397 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:31:53,405 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:31:53,439 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_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-1.i[22636,22649] [2021-11-25 20:31:53,453 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:31:53,484 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:31:53,485 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53 WrapperNode [2021-11-25 20:31:53,485 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:31:53,486 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:31:53,486 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:31:53,486 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:31:53,494 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,509 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,538 INFO L137 Inliner]: procedures = 129, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 200 [2021-11-25 20:31:53,538 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:31:53,539 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:31:53,539 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:31:53,539 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:31:53,547 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,547 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,553 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,553 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,565 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,574 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,577 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,582 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:31:53,583 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:31:53,583 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:31:53,583 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:31:53,584 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (1/1) ... [2021-11-25 20:31:53,600 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:31:53,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:53,620 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:31:53,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:31:53,667 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2021-11-25 20:31:53,667 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2021-11-25 20:31:53,667 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 20:31:53,667 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:31:53,667 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:31:53,667 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-25 20:31:53,667 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-25 20:31:53,667 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2021-11-25 20:31:53,668 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2021-11-25 20:31:53,668 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:31:53,668 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-25 20:31:53,668 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2021-11-25 20:31:53,668 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2021-11-25 20:31:53,668 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:31:53,668 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2021-11-25 20:31:53,669 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2021-11-25 20:31:53,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:31:53,669 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:31:53,860 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:31:53,862 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:31:54,279 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:31:54,325 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:31:54,325 INFO L301 CfgBuilder]: Removed 33 assume(true) statements. [2021-11-25 20:31:54,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:31:54 BoogieIcfgContainer [2021-11-25 20:31:54,328 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:31:54,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:31:54,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:31:54,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:31:54,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:31:52" (1/3) ... [2021-11-25 20:31:54,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@798335ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:31:54, skipping insertion in model container [2021-11-25 20:31:54,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:31:53" (2/3) ... [2021-11-25 20:31:54,335 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@798335ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:31:54, skipping insertion in model container [2021-11-25 20:31:54,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:31:54" (3/3) ... [2021-11-25 20:31:54,337 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-1.i [2021-11-25 20:31:54,342 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:31:54,342 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:31:54,390 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:31:54,397 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 20:31:54,397 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:31:54,416 INFO L276 IsEmpty]: Start isEmpty. Operand has 78 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 65 states have internal predecessors, (97), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-25 20:31:54,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:31:54,421 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:54,422 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:54,422 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:54,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:54,428 INFO L85 PathProgramCache]: Analyzing trace with hash -996344974, now seen corresponding path program 1 times [2021-11-25 20:31:54,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:54,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86760999] [2021-11-25 20:31:54,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:54,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:54,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:54,596 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:31:54,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:54,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86760999] [2021-11-25 20:31:54,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86760999] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:31:54,598 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:31:54,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:31:54,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671562935] [2021-11-25 20:31:54,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:31:54,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 20:31:54,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:54,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 20:31:54,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 20:31:54,635 INFO L87 Difference]: Start difference. First operand has 78 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 65 states have internal predecessors, (97), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:54,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:54,696 INFO L93 Difference]: Finished difference Result 151 states and 261 transitions. [2021-11-25 20:31:54,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 20:31:54,698 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-25 20:31:54,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:54,707 INFO L225 Difference]: With dead ends: 151 [2021-11-25 20:31:54,707 INFO L226 Difference]: Without dead ends: 74 [2021-11-25 20:31:54,711 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 20:31:54,715 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:54,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 86 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:31:54,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-25 20:31:54,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-11-25 20:31:54,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 53 states have (on average 1.3018867924528301) internal successors, (69), 62 states have internal predecessors, (69), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 20:31:54,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 94 transitions. [2021-11-25 20:31:54,760 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 94 transitions. Word has length 13 [2021-11-25 20:31:54,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:54,760 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 94 transitions. [2021-11-25 20:31:54,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:54,761 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 94 transitions. [2021-11-25 20:31:54,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 20:31:54,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:31:54,763 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:31:54,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:31:54,763 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:31:54,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:31:54,764 INFO L85 PathProgramCache]: Analyzing trace with hash -811379383, now seen corresponding path program 1 times [2021-11-25 20:31:54,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:31:54,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438590335] [2021-11-25 20:31:54,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:54,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:31:55,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:55,773 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:31:55,773 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:31:55,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438590335] [2021-11-25 20:31:55,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438590335] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:55,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352498049] [2021-11-25 20:31:55,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:31:55,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:55,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:31:55,777 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:31:55,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:31:55,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:31:55,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-25 20:31:56,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:31:56,258 INFO L354 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2021-11-25 20:31:56,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 51 [2021-11-25 20:31:56,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:31:56,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2021-11-25 20:31:56,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:31:56,397 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:31:56,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 34 [2021-11-25 20:31:56,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2021-11-25 20:31:56,629 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:31:56,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2021-11-25 20:31:56,835 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-25 20:31:56,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 29 [2021-11-25 20:31:56,943 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:31:56,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 8 [2021-11-25 20:31:56,995 WARN L860 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| Int) (v_ArrVal_311 (Array Int Int)) (v_ArrVal_310 (Array Int Int))) (and (< |chain_node_~node~0#1.base| |c_#StackHeapBarrier|) (= (store (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_310) |c_chain_node_#in~ppnode#1.base| (store (select (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_311) |c_chain_node_#in~ppnode#1.base|) |c_chain_node_#in~ppnode#1.offset| |chain_node_~node~0#1.base|)) |c_#memory_$Pointer$.base|) (not (= |chain_node_~node~0#1.base| 0)))) is different from true [2021-11-25 20:31:57,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,073 INFO L354 Elim1Store]: treesize reduction 13, result has 58.1 percent of original size [2021-11-25 20:31:57,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 34 treesize of output 44 [2021-11-25 20:31:57,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 33 [2021-11-25 20:31:57,326 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:31:57,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 30 [2021-11-25 20:31:57,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2021-11-25 20:31:57,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:31:57,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352498049] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:31:57,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1031807128] [2021-11-25 20:31:57,601 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-25 20:31:57,601 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:31:57,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:31:57,610 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:31:57,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:31:57,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,731 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-25 20:31:57,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-25 20:31:57,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:57,825 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-25 20:31:57,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-25 20:31:57,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:31:58,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,032 INFO L354 Elim1Store]: treesize reduction 44, result has 44.3 percent of original size [2021-11-25 20:31:58,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 35 [2021-11-25 20:31:58,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:31:58,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,112 INFO L354 Elim1Store]: treesize reduction 72, result has 48.9 percent of original size [2021-11-25 20:31:58,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 382 treesize of output 153 [2021-11-25 20:31:58,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:31:58,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:31:58,199 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:31:58,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,249 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-25 20:31:58,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 42 treesize of output 28 [2021-11-25 20:31:58,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,334 INFO L354 Elim1Store]: treesize reduction 100, result has 29.1 percent of original size [2021-11-25 20:31:58,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 382 treesize of output 125 [2021-11-25 20:31:58,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:31:58,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:31:58,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,416 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-25 20:31:58,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 10 [2021-11-25 20:31:58,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-25 20:31:58,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 20:31:58,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:31:58,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:31:58,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-25 20:31:58,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:31:58,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:58,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 20:31:58,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:31:59,038 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:59,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:59,059 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:31:59,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 343 treesize of output 284 [2021-11-25 20:31:59,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:59,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:59,085 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:59,114 INFO L354 Elim1Store]: treesize reduction 56, result has 25.3 percent of original size [2021-11-25 20:31:59,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 343 treesize of output 332 [2021-11-25 20:31:59,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:31:59,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:31:59,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:59,378 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:59,379 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:59,411 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-25 20:31:59,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 354 treesize of output 294 [2021-11-25 20:31:59,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:31:59,438 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:59,439 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:59,439 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:31:59,477 INFO L354 Elim1Store]: treesize reduction 92, result has 22.0 percent of original size [2021-11-25 20:31:59,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 354 treesize of output 342 [2021-11-25 20:32:00,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:00,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:00,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:00,590 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:00,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:00,600 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 20:32:00,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 350 treesize of output 269 [2021-11-25 20:32:00,625 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:00,626 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:00,627 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:00,634 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-25 20:32:00,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 282 treesize of output 246 [2021-11-25 20:32:00,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:00,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:01,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:01,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:01,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:01,754 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 20:32:01,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 350 treesize of output 269 [2021-11-25 20:32:01,774 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:01,778 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:01,779 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:01,786 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-25 20:32:01,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 282 treesize of output 246 [2021-11-25 20:32:01,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:01,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:02,084 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-25 20:32:02,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 334 treesize of output 330 [2021-11-25 20:32:04,011 INFO L197 IcfgInterpreter]: Interpreting procedure chain_node with input of size 154 for LOIs [2021-11-25 20:32:06,614 INFO L197 IcfgInterpreter]: Interpreting procedure check_seq_next with input of size 93 for LOIs [2021-11-25 20:32:07,458 INFO L197 IcfgInterpreter]: Interpreting procedure fail with input of size 72 for LOIs [2021-11-25 20:32:07,613 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:32:21,888 WARN L227 SmtUtils]: Spent 13.26s on a formula simplification. DAG size of input: 217 DAG size of output: 213 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:32:25,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '536#(exists ((|v_ULTIMATE.start_create_sll_~#list~0#1.base_21| Int) (|v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7| Int)) (and (= (select |#valid| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) (<= 0 |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) (<= 0 |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|) (or (and (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) 0) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_21| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|)) (not (= 2 |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|)) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 4) 0) (< |#StackHeapBarrier| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|) 0) 0) (= (select |#length| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 8) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 4) 0) (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7| 0)) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) 0)) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_21| 0)) (< |#StackHeapBarrier| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|) (not (= 2 |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|)) (= (select |#valid| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 1) (= |#NULL.offset| 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|) 0) 0) (< (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) |#StackHeapBarrier|) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) 0) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_21| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|)) (not (= 2 |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|)) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 4) 0) (< |#StackHeapBarrier| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|) 0) 0) (= (select |#length| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 8) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 4) 0) (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7| 0)) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) 0)) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_21| 0)) (< |#StackHeapBarrier| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|) (not (= 2 |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|)) (= (select |#valid| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 1) (= |#NULL.offset| 0) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0)) 0) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_7|) 0) 0) (< (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_21|) 0) |#StackHeapBarrier|) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)))))' at error location [2021-11-25 20:32:25,439 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:32:25,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:32:25,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 19 [2021-11-25 20:32:25,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153240868] [2021-11-25 20:32:25,440 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:25,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:32:25,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:25,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:32:25,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=980, Unknown=8, NotChecked=64, Total=1190 [2021-11-25 20:32:25,443 INFO L87 Difference]: Start difference. First operand 74 states and 94 transitions. Second operand has 19 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 16 states have internal predecessors, (28), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 20:32:26,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:26,398 INFO L93 Difference]: Finished difference Result 115 states and 148 transitions. [2021-11-25 20:32:26,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:32:26,399 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 16 states have internal predecessors, (28), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 22 [2021-11-25 20:32:26,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:26,402 INFO L225 Difference]: With dead ends: 115 [2021-11-25 20:32:26,403 INFO L226 Difference]: Without dead ends: 112 [2021-11-25 20:32:26,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=204, Invalid=1511, Unknown=11, NotChecked=80, Total=1806 [2021-11-25 20:32:26,405 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 133 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 130 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:26,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 431 Invalid, 642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 444 Invalid, 0 Unknown, 130 Unchecked, 0.5s Time] [2021-11-25 20:32:26,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-25 20:32:26,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 97. [2021-11-25 20:32:26,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 71 states have (on average 1.295774647887324) internal successors, (92), 81 states have internal predecessors, (92), 20 states have call successors, (20), 6 states have call predecessors, (20), 5 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 20:32:26,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 123 transitions. [2021-11-25 20:32:26,428 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 123 transitions. Word has length 22 [2021-11-25 20:32:26,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:26,430 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 123 transitions. [2021-11-25 20:32:26,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 16 states have internal predecessors, (28), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 20:32:26,430 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 123 transitions. [2021-11-25 20:32:26,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 20:32:26,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:26,432 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:26,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:26,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:26,653 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:26,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:26,654 INFO L85 PathProgramCache]: Analyzing trace with hash 1941316115, now seen corresponding path program 1 times [2021-11-25 20:32:26,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:26,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060064366] [2021-11-25 20:32:26,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:26,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:26,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:27,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:32:27,139 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:27,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060064366] [2021-11-25 20:32:27,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2060064366] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:27,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584297239] [2021-11-25 20:32:27,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:27,139 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:27,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:27,140 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:27,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:32:27,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:27,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-25 20:32:27,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:27,403 INFO L354 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2021-11-25 20:32:27,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 51 [2021-11-25 20:32:27,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:32:27,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2021-11-25 20:32:27,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:32:27,463 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:32:27,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 34 [2021-11-25 20:32:27,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2021-11-25 20:32:27,591 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:32:27,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2021-11-25 20:32:27,692 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-25 20:32:27,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 29 [2021-11-25 20:32:27,753 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:32:27,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 8 [2021-11-25 20:32:27,779 WARN L860 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| Int) (v_ArrVal_632 (Array Int Int)) (v_ArrVal_631 (Array Int Int))) (and (< |chain_node_~node~0#1.base| |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_631) |c_chain_node_#in~ppnode#1.base| (store (select (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_632) |c_chain_node_#in~ppnode#1.base|) |c_chain_node_#in~ppnode#1.offset| |chain_node_~node~0#1.base|))) (not (= |chain_node_~node~0#1.base| 0)))) is different from true [2021-11-25 20:32:27,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:27,851 INFO L354 Elim1Store]: treesize reduction 52, result has 46.4 percent of original size [2021-11-25 20:32:27,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 56 treesize of output 90 [2021-11-25 20:32:27,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:32:27,911 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:32:27,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 42 [2021-11-25 20:32:27,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 22 [2021-11-25 20:32:27,972 INFO L354 Elim1Store]: treesize reduction 17, result has 32.0 percent of original size [2021-11-25 20:32:27,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 58 treesize of output 53 [2021-11-25 20:32:27,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 22 [2021-11-25 20:32:28,283 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 51 [2021-11-25 20:32:28,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:32:28,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 17 [2021-11-25 20:32:28,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:28,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-25 20:32:28,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-25 20:32:28,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2021-11-25 20:32:28,709 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:32:28,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 25 [2021-11-25 20:32:28,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2021-11-25 20:32:28,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:28,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584297239] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:28,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1135075668] [2021-11-25 20:32:28,917 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 20:32:28,917 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:28,917 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:32:28,918 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:32:28,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:32:28,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:28,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:28,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,023 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-25 20:32:29,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-25 20:32:29,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2021-11-25 20:32:29,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,147 INFO L354 Elim1Store]: treesize reduction 100, result has 29.1 percent of original size [2021-11-25 20:32:29,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 382 treesize of output 125 [2021-11-25 20:32:29,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:32:29,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:32:29,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,219 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-25 20:32:29,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 10 [2021-11-25 20:32:29,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,290 INFO L354 Elim1Store]: treesize reduction 44, result has 44.3 percent of original size [2021-11-25 20:32:29,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 35 [2021-11-25 20:32:29,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:32:29,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,367 INFO L354 Elim1Store]: treesize reduction 72, result has 48.9 percent of original size [2021-11-25 20:32:29,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 386 treesize of output 157 [2021-11-25 20:32:29,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,420 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-25 20:32:29,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 10 [2021-11-25 20:32:29,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 17 [2021-11-25 20:32:29,479 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:32:29,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 17 [2021-11-25 20:32:29,504 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:32:29,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:32:29,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-25 20:32:29,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:29,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:29,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 20:32:29,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:29,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:29,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-25 20:32:29,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 20:32:29,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:32:29,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,859 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:32:29,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 79 treesize of output 56 [2021-11-25 20:32:29,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 32 [2021-11-25 20:32:29,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:32:29,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,968 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:32:29,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 10 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 90 treesize of output 66 [2021-11-25 20:32:29,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:29,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 11 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 42 [2021-11-25 20:32:30,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,137 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:32:30,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 86 treesize of output 41 [2021-11-25 20:32:30,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 11 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2021-11-25 20:32:30,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:30,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:30,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,343 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:32:30,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 86 treesize of output 41 [2021-11-25 20:32:30,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:30,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 11 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2021-11-25 20:32:30,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:30,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:30,584 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-25 20:32:30,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 334 treesize of output 330 [2021-11-25 20:32:31,785 INFO L197 IcfgInterpreter]: Interpreting procedure chain_node with input of size 153 for LOIs [2021-11-25 20:32:32,494 INFO L197 IcfgInterpreter]: Interpreting procedure check_seq_next with input of size 93 for LOIs [2021-11-25 20:32:34,174 INFO L197 IcfgInterpreter]: Interpreting procedure fail with input of size 92 for LOIs [2021-11-25 20:32:34,596 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:32:48,202 WARN L227 SmtUtils]: Spent 12.70s on a formula simplification. DAG size of input: 216 DAG size of output: 206 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:32:51,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1015#(exists ((|v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| Int) (|v_ULTIMATE.start_create_sll_~#list~0#1.base_24| Int) (|v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14| Int)) (and (= (select |#valid| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0) (<= 0 |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14|) (<= 0 |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|) (<= 0 |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) (or (and (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|)) (or (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14|) 0) 0)) (not (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14|) 0) 0))) (< (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0) |#StackHeapBarrier|) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 4) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|) 0) 0) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 0) 0) (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|)) (not (= 2 |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|) 0) 0) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0) 0)) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 4) 0) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0) 0) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_24| 0)) (< |#StackHeapBarrier| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| 2)) (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| 0)) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_24| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|)) (= (select |#length| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 8) (= |#NULL.offset| 0) (= (select |#valid| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 1) (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_24| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) (not (= 2 |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|)) (not (= |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14| 0)) (< |#StackHeapBarrier| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14|) (< |#StackHeapBarrier| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|)) (or (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14|) 0) 0)) (not (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14|) 0) 0))) (< (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0) |#StackHeapBarrier|) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 4) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|) 0) 0) (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|)) (not (= 2 |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|) 0) 0) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0) 0)) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 4) 0) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0) 0) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_24| 0)) (< |#StackHeapBarrier| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| 2)) (not (= |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14| 0)) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_24| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|)) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_24| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0))) (= (select |#length| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 8) (= |#NULL.offset| 0) (= (select |#valid| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|) 0)) 1) (not (= 2 |v_ULTIMATE.start_create_sll_~#list~0#1.base_24|)) (not (= |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14| 0)) (< |#StackHeapBarrier| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_14|) (< |#StackHeapBarrier| |v_ULTIMATE.start_main_~#p2~0#1.base_BEFORE_CALL_14|) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)))))' at error location [2021-11-25 20:32:51,345 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:32:51,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:32:51,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 19 [2021-11-25 20:32:51,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575685381] [2021-11-25 20:32:51,346 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:32:51,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:32:51,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:32:51,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:32:51,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1035, Unknown=10, NotChecked=66, Total=1260 [2021-11-25 20:32:51,348 INFO L87 Difference]: Start difference. First operand 97 states and 123 transitions. Second operand has 19 states, 11 states have (on average 2.727272727272727) internal successors, (30), 16 states have internal predecessors, (30), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 20:32:52,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:32:52,099 INFO L93 Difference]: Finished difference Result 107 states and 133 transitions. [2021-11-25 20:32:52,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:32:52,099 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 11 states have (on average 2.727272727272727) internal successors, (30), 16 states have internal predecessors, (30), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 24 [2021-11-25 20:32:52,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:32:52,101 INFO L225 Difference]: With dead ends: 107 [2021-11-25 20:32:52,101 INFO L226 Difference]: Without dead ends: 104 [2021-11-25 20:32:52,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=212, Invalid=1500, Unknown=14, NotChecked=80, Total=1806 [2021-11-25 20:32:52,103 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 90 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 532 SdHoareTripleChecker+Invalid, 769 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 195 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:32:52,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 532 Invalid, 769 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 539 Invalid, 0 Unknown, 195 Unchecked, 0.4s Time] [2021-11-25 20:32:52,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-25 20:32:52,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 96. [2021-11-25 20:32:52,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 71 states have (on average 1.2816901408450705) internal successors, (91), 80 states have internal predecessors, (91), 19 states have call successors, (19), 6 states have call predecessors, (19), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 20:32:52,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 120 transitions. [2021-11-25 20:32:52,117 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 120 transitions. Word has length 24 [2021-11-25 20:32:52,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:32:52,118 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 120 transitions. [2021-11-25 20:32:52,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 11 states have (on average 2.727272727272727) internal successors, (30), 16 states have internal predecessors, (30), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 20:32:52,118 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 120 transitions. [2021-11-25 20:32:52,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 20:32:52,119 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:32:52,120 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:32:52,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:32:52,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:52,328 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:32:52,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:32:52,328 INFO L85 PathProgramCache]: Analyzing trace with hash -1409252445, now seen corresponding path program 1 times [2021-11-25 20:32:52,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:32:52,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676343017] [2021-11-25 20:32:52,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:52,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:32:52,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:52,934 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:32:52,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:32:52,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676343017] [2021-11-25 20:32:52,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676343017] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:52,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473304702] [2021-11-25 20:32:52,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:32:52,935 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:32:52,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:32:52,945 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:32:52,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:32:53,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:32:53,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-25 20:32:53,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:32:53,190 INFO L354 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2021-11-25 20:32:53,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 51 [2021-11-25 20:32:53,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:32:53,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2021-11-25 20:32:53,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-25 20:32:53,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-25 20:32:53,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-25 20:32:53,360 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:32:53,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2021-11-25 20:32:53,467 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-25 20:32:53,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 29 [2021-11-25 20:32:53,527 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 20:32:53,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 11 [2021-11-25 20:32:53,557 WARN L860 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| Int) (v_ArrVal_1065 (Array Int Int)) (v_ArrVal_1064 (Array Int Int)) (|chain_node_alloc_node_~ptr~0#1.base| Int) (v_ArrVal_1063 (Array Int Int))) (and (< |chain_node_alloc_node_~ptr~0#1.base| |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store (store (store |c_old(#memory_$Pointer$.base)| |chain_node_alloc_node_~ptr~0#1.base| v_ArrVal_1065) |chain_node_~node~0#1.base| v_ArrVal_1063) |c_chain_node_#in~ppnode#1.base| v_ArrVal_1064)) (<= |chain_node_~node~0#1.base| |chain_node_alloc_node_~ptr~0#1.base|))) is different from true [2021-11-25 20:32:53,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:53,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:53,652 INFO L354 Elim1Store]: treesize reduction 90, result has 40.8 percent of original size [2021-11-25 20:32:53,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 43 treesize of output 87 [2021-11-25 20:32:53,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2021-11-25 20:32:53,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2021-11-25 20:32:53,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2021-11-25 20:32:53,918 WARN L860 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| Int) (v_ArrVal_1073 (Array Int Int)) (v_ArrVal_1072 (Array Int Int))) (and (< |chain_node_~node~0#1.base| |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1073) |c_chain_node_#in~ppnode#1.base| (store (select (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1072) |c_chain_node_#in~ppnode#1.base|) |c_chain_node_#in~ppnode#1.offset| |chain_node_~node~0#1.base|))) (not (= |chain_node_~node~0#1.base| 0)))) is different from true [2021-11-25 20:32:53,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:53,992 INFO L354 Elim1Store]: treesize reduction 52, result has 46.4 percent of original size [2021-11-25 20:32:53,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 49 treesize of output 87 [2021-11-25 20:32:54,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:32:54,044 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:32:54,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:54,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-25 20:32:54,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2021-11-25 20:32:54,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2021-11-25 20:32:54,361 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:32:54,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 35 [2021-11-25 20:32:54,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2021-11-25 20:32:54,424 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 20:32:54,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 67 treesize of output 52 [2021-11-25 20:32:54,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-25 20:32:54,573 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:32:54,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 25 [2021-11-25 20:32:54,588 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2021-11-25 20:32:54,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:32:54,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473304702] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:32:54,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1995988723] [2021-11-25 20:32:54,772 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-25 20:32:54,772 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:32:54,773 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:32:54,773 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:32:54,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:32:54,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:54,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:54,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:54,870 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-25 20:32:54,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-25 20:32:54,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:54,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:54,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:54,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2021-11-25 20:32:54,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:54,989 INFO L354 Elim1Store]: treesize reduction 100, result has 29.1 percent of original size [2021-11-25 20:32:54,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 386 treesize of output 129 [2021-11-25 20:32:55,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:32:55,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:32:55,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,044 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-25 20:32:55,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 10 [2021-11-25 20:32:55,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,111 INFO L354 Elim1Store]: treesize reduction 44, result has 44.3 percent of original size [2021-11-25 20:32:55,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 35 [2021-11-25 20:32:55,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:32:55,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,175 INFO L354 Elim1Store]: treesize reduction 72, result has 48.9 percent of original size [2021-11-25 20:32:55,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 386 treesize of output 157 [2021-11-25 20:32:55,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:55,211 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:32:55,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 17 [2021-11-25 20:32:55,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,271 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-25 20:32:55,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 18 [2021-11-25 20:32:55,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:32:55,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:55,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-25 20:32:55,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 20:32:55,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:55,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-25 20:32:55,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 20:32:55,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:55,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:32:55,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:55,717 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:32:55,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 343 treesize of output 284 [2021-11-25 20:32:55,728 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:55,728 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:55,747 INFO L354 Elim1Store]: treesize reduction 56, result has 25.3 percent of original size [2021-11-25 20:32:55,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 343 treesize of output 332 [2021-11-25 20:32:55,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:32:55,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:55,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:55,881 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:55,902 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-25 20:32:55,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 354 treesize of output 294 [2021-11-25 20:32:55,932 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:55,933 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:55,934 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:55,978 INFO L354 Elim1Store]: treesize reduction 92, result has 22.0 percent of original size [2021-11-25 20:32:55,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 354 treesize of output 342 [2021-11-25 20:32:56,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:32:56,759 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:56,759 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:56,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:56,768 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 20:32:56,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 350 treesize of output 269 [2021-11-25 20:32:56,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:56,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:56,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:56,790 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:56,790 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:56,791 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:56,799 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-25 20:32:56,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 282 treesize of output 246 [2021-11-25 20:32:56,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:56,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:57,586 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:57,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:57,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:57,593 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 20:32:57,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 350 treesize of output 269 [2021-11-25 20:32:57,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:57,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:57,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:32:57,609 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:57,610 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:57,610 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:32:57,616 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-25 20:32:57,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 282 treesize of output 246 [2021-11-25 20:32:57,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:57,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:32:57,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:32:57,991 INFO L197 IcfgInterpreter]: Interpreting procedure chain_node with input of size 100 for LOIs [2021-11-25 20:32:58,337 INFO L197 IcfgInterpreter]: Interpreting procedure check_seq_next with input of size 41 for LOIs [2021-11-25 20:32:58,394 INFO L197 IcfgInterpreter]: Interpreting procedure fail with input of size 27 for LOIs [2021-11-25 20:32:58,400 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:04,984 WARN L227 SmtUtils]: Spent 6.06s on a formula simplification. DAG size of input: 164 DAG size of output: 94 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:33:07,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1486#(and (exists ((|v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_27| Int)) (and (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_27|) 0) 0) (<= 0 |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_27|) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_27|) 0) 0))) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_create_sll_~#list~0#1.base_27| Int)) (and (<= 0 |v_ULTIMATE.start_create_sll_~#list~0#1.base_27|) (= (select |#valid| |v_ULTIMATE.start_create_sll_~#list~0#1.base_27|) 0))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:07,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:07,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:33:07,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 23 [2021-11-25 20:33:07,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914548862] [2021-11-25 20:33:07,060 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:07,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:33:07,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:07,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:33:07,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1182, Unknown=13, NotChecked=142, Total=1482 [2021-11-25 20:33:07,063 INFO L87 Difference]: Start difference. First operand 96 states and 120 transitions. Second operand has 23 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 20 states have internal predecessors, (34), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 20:33:08,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:08,126 INFO L93 Difference]: Finished difference Result 130 states and 163 transitions. [2021-11-25 20:33:08,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 20:33:08,126 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 20 states have internal predecessors, (34), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 27 [2021-11-25 20:33:08,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:08,128 INFO L225 Difference]: With dead ends: 130 [2021-11-25 20:33:08,128 INFO L226 Difference]: Without dead ends: 127 [2021-11-25 20:33:08,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=197, Invalid=1688, Unknown=15, NotChecked=170, Total=2070 [2021-11-25 20:33:08,130 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 125 mSDsluCounter, 557 mSDsCounter, 0 mSdLazyCounter, 585 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 594 SdHoareTripleChecker+Invalid, 1059 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 585 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 419 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:08,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 594 Invalid, 1059 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 585 Invalid, 0 Unknown, 419 Unchecked, 0.6s Time] [2021-11-25 20:33:08,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-25 20:33:08,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 119. [2021-11-25 20:33:08,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 88 states have (on average 1.2840909090909092) internal successors, (113), 99 states have internal predecessors, (113), 23 states have call successors, (23), 8 states have call predecessors, (23), 7 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 20:33:08,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 150 transitions. [2021-11-25 20:33:08,154 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 150 transitions. Word has length 27 [2021-11-25 20:33:08,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:08,154 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 150 transitions. [2021-11-25 20:33:08,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 20 states have internal predecessors, (34), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 20:33:08,154 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 150 transitions. [2021-11-25 20:33:08,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 20:33:08,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:08,156 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:08,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:08,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-25 20:33:08,372 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:08,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:08,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1814393797, now seen corresponding path program 1 times [2021-11-25 20:33:08,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:08,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815506698] [2021-11-25 20:33:08,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:08,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:08,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:08,836 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:33:08,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:08,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815506698] [2021-11-25 20:33:08,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815506698] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:08,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062610114] [2021-11-25 20:33:08,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:08,837 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:08,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:08,838 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:08,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:33:09,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:09,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-25 20:33:09,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:09,222 INFO L354 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2021-11-25 20:33:09,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 51 [2021-11-25 20:33:09,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:33:09,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2021-11-25 20:33:09,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:33:09,268 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:33:09,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 34 [2021-11-25 20:33:09,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2021-11-25 20:33:09,363 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:33:09,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2021-11-25 20:33:09,404 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:33:09,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 8 [2021-11-25 20:33:09,422 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_1504 (Array Int Int)) (|chain_node_~node~0#1.base| Int) (v_ArrVal_1494 (Array Int Int))) (and (= (store (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1494) |c_chain_node_#in~ppnode#1.base| (store (select (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1504) |c_chain_node_#in~ppnode#1.base|) |c_chain_node_#in~ppnode#1.offset| |chain_node_~node~0#1.base|)) |c_#memory_$Pointer$.base|) (< |chain_node_~node~0#1.base| |c_#StackHeapBarrier|) (not (= |chain_node_~node~0#1.base| 0)))) is different from true [2021-11-25 20:33:09,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:09,474 INFO L354 Elim1Store]: treesize reduction 52, result has 46.4 percent of original size [2021-11-25 20:33:09,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 56 treesize of output 90 [2021-11-25 20:33:09,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:33:09,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 44 [2021-11-25 20:33:09,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:09,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 26 [2021-11-25 20:33:09,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-25 20:33:09,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:09,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 35 [2021-11-25 20:33:09,649 INFO L354 Elim1Store]: treesize reduction 17, result has 32.0 percent of original size [2021-11-25 20:33:09,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 72 treesize of output 67 [2021-11-25 20:33:09,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-25 20:33:09,784 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:33:09,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 25 [2021-11-25 20:33:09,814 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2021-11-25 20:33:09,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:09,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062610114] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:09,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [171519315] [2021-11-25 20:33:09,978 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2021-11-25 20:33:09,978 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:09,979 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:09,979 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:09,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:10,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,055 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-25 20:33:10,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-25 20:33:10,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2021-11-25 20:33:10,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,170 INFO L354 Elim1Store]: treesize reduction 100, result has 29.1 percent of original size [2021-11-25 20:33:10,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 382 treesize of output 125 [2021-11-25 20:33:10,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:33:10,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:33:10,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,210 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-25 20:33:10,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 10 [2021-11-25 20:33:10,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,285 INFO L354 Elim1Store]: treesize reduction 72, result has 48.9 percent of original size [2021-11-25 20:33:10,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 382 treesize of output 153 [2021-11-25 20:33:10,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,351 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-25 20:33:10,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 18 [2021-11-25 20:33:10,378 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 20:33:10,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:33:10,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 17 [2021-11-25 20:33:10,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,466 INFO L354 Elim1Store]: treesize reduction 44, result has 44.3 percent of original size [2021-11-25 20:33:10,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 35 [2021-11-25 20:33:10,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:33:10,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:33:10,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:33:10,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-25 20:33:10,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:33:10,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 20:33:10,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:33:10,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-25 20:33:10,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-11-25 20:33:10,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 16 [2021-11-25 20:33:10,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:33:10,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:10,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:10,821 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:33:10,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 343 treesize of output 284 [2021-11-25 20:33:10,831 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:10,832 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:10,850 INFO L354 Elim1Store]: treesize reduction 56, result has 25.3 percent of original size [2021-11-25 20:33:10,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 343 treesize of output 332 [2021-11-25 20:33:11,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,424 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:11,429 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:33:11,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 266 [2021-11-25 20:33:11,438 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:11,439 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:11,444 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 20:33:11,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 271 treesize of output 243 [2021-11-25 20:33:11,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:33:11,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:33:11,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,945 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:11,950 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:33:11,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 266 [2021-11-25 20:33:11,959 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:11,960 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:11,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:11,965 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-25 20:33:11,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 271 treesize of output 243 [2021-11-25 20:33:11,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:33:11,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:33:12,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2021-11-25 20:33:12,416 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:12,423 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:33:12,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2021-11-25 20:33:12,444 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:12,452 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-25 20:33:12,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2021-11-25 20:33:12,530 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:12,532 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:33:12,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 3 [2021-11-25 20:33:12,548 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:12,551 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:33:12,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 3 [2021-11-25 20:33:12,619 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:12,622 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:33:12,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 3 [2021-11-25 20:33:12,630 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:12,633 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 20:33:12,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 3 [2021-11-25 20:33:12,730 INFO L354 Elim1Store]: treesize reduction 18, result has 62.5 percent of original size [2021-11-25 20:33:12,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 162 treesize of output 182 [2021-11-25 20:33:13,073 INFO L197 IcfgInterpreter]: Interpreting procedure chain_node with input of size 12 for LOIs [2021-11-25 20:33:13,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-25 20:33:13,089 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:13,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,095 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:13,112 INFO L354 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2021-11-25 20:33:13,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 176 treesize of output 67 [2021-11-25 20:33:13,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:33:13,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 10 [2021-11-25 20:33:13,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,166 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:13,176 INFO L354 Elim1Store]: treesize reduction 17, result has 39.3 percent of original size [2021-11-25 20:33:13,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 83 treesize of output 21 [2021-11-25 20:33:13,181 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:13,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,190 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:13,209 INFO L354 Elim1Store]: treesize reduction 24, result has 48.9 percent of original size [2021-11-25 20:33:13,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 176 treesize of output 71 [2021-11-25 20:33:13,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-11-25 20:33:13,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:13,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 10 [2021-11-25 20:33:13,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:33:13,259 INFO L197 IcfgInterpreter]: Interpreting procedure check_seq_next with input of size 77 for LOIs [2021-11-25 20:33:13,572 INFO L197 IcfgInterpreter]: Interpreting procedure fail with input of size 65 for LOIs [2021-11-25 20:33:13,631 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:16,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2019#(and (<= 0 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_43| Int) (|v_ULTIMATE.start_create_sll_~#list~0#1.base_30| Int)) (and (= (select |#valid| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0) (<= 0 |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) (<= 0 |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_43|) (or (and (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_43|) 0) 0) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0) |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 4) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_43|) 0) 0) (not (= |v_ULTIMATE.start_create_sll_~#list~0#1.base_30| 0)) (= |#NULL.offset| 0) (< |v_ULTIMATE.start_create_sll_~#list~0#1.base_30| |#StackHeapBarrier|) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 4) 0) (= |#NULL.base| 0) (= (select |#length| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 8)) (and (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_43|) 0) 0) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0)) 4) 0) (= 8 (select |#length| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0))) (= (select |#valid| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0)) 1) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0) 0) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0)) 4) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#p1~0#1.base_BEFORE_CALL_43|) 0) 0) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0) |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|)) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0) 0)) (= |#NULL.offset| 0) (< (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_create_sll_~#list~0#1.base_30|) 0) |#StackHeapBarrier|) (= |#NULL.base| 0))))))' at error location [2021-11-25 20:33:16,136 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:16,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:33:16,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2021-11-25 20:33:16,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387377835] [2021-11-25 20:33:16,136 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:16,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:33:16,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:16,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:33:16,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=948, Unknown=8, NotChecked=62, Total=1122 [2021-11-25 20:33:16,137 INFO L87 Difference]: Start difference. First operand 119 states and 150 transitions. Second operand has 17 states, 11 states have (on average 3.0) internal successors, (33), 15 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 20:33:16,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:16,984 INFO L93 Difference]: Finished difference Result 172 states and 219 transitions. [2021-11-25 20:33:16,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:33:16,985 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 3.0) internal successors, (33), 15 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 27 [2021-11-25 20:33:16,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:16,987 INFO L225 Difference]: With dead ends: 172 [2021-11-25 20:33:16,987 INFO L226 Difference]: Without dead ends: 169 [2021-11-25 20:33:16,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=139, Invalid=1337, Unknown=10, NotChecked=74, Total=1560 [2021-11-25 20:33:16,989 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 104 mSDsluCounter, 685 mSDsCounter, 0 mSdLazyCounter, 849 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 740 SdHoareTripleChecker+Invalid, 1154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 849 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:16,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 740 Invalid, 1154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 849 Invalid, 0 Unknown, 261 Unchecked, 0.7s Time] [2021-11-25 20:33:16,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-25 20:33:17,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 122. [2021-11-25 20:33:17,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 90 states have (on average 1.288888888888889) internal successors, (116), 101 states have internal predecessors, (116), 24 states have call successors, (24), 8 states have call predecessors, (24), 7 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 20:33:17,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 155 transitions. [2021-11-25 20:33:17,005 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 155 transitions. Word has length 27 [2021-11-25 20:33:17,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:17,005 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 155 transitions. [2021-11-25 20:33:17,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 3.0) internal successors, (33), 15 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 20:33:17,005 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 155 transitions. [2021-11-25 20:33:17,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 20:33:17,007 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:17,007 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:17,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:17,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:17,223 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:17,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:17,224 INFO L85 PathProgramCache]: Analyzing trace with hash 128159807, now seen corresponding path program 1 times [2021-11-25 20:33:17,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:17,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488232552] [2021-11-25 20:33:17,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:17,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:17,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 20:33:17,352 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-25 20:33:17,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 20:33:17,458 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-25 20:33:17,458 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-25 20:33:17,459 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location failErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 20:33:17,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:33:17,464 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2021-11-25 20:33:17,467 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 20:33:17,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 08:33:17 BoogieIcfgContainer [2021-11-25 20:33:17,528 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 20:33:17,529 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 20:33:17,529 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 20:33:17,529 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 20:33:17,530 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:31:54" (3/4) ... [2021-11-25 20:33:17,532 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-11-25 20:33:17,593 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/witness.graphml [2021-11-25 20:33:17,593 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 20:33:17,593 INFO L158 Benchmark]: Toolchain (without parser) took 84609.18ms. Allocated memory was 102.8MB in the beginning and 352.3MB in the end (delta: 249.6MB). Free memory was 69.1MB in the beginning and 292.9MB in the end (delta: -223.8MB). Peak memory consumption was 25.5MB. Max. memory is 16.1GB. [2021-11-25 20:33:17,594 INFO L158 Benchmark]: CDTParser took 0.19ms. Allocated memory is still 102.8MB. Free memory was 55.9MB in the beginning and 55.8MB in the end (delta: 84.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 20:33:17,594 INFO L158 Benchmark]: CACSL2BoogieTranslator took 499.32ms. Allocated memory is still 102.8MB. Free memory was 68.8MB in the beginning and 66.9MB in the end (delta: 2.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-25 20:33:17,594 INFO L158 Benchmark]: Boogie Procedure Inliner took 52.34ms. Allocated memory is still 102.8MB. Free memory was 66.9MB in the beginning and 64.5MB in the end (delta: 2.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 20:33:17,595 INFO L158 Benchmark]: Boogie Preprocessor took 43.29ms. Allocated memory is still 102.8MB. Free memory was 64.5MB in the beginning and 62.4MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 20:33:17,599 INFO L158 Benchmark]: RCFGBuilder took 745.45ms. Allocated memory was 102.8MB in the beginning and 134.2MB in the end (delta: 31.5MB). Free memory was 62.4MB in the beginning and 98.6MB in the end (delta: -36.2MB). Peak memory consumption was 22.8MB. Max. memory is 16.1GB. [2021-11-25 20:33:17,600 INFO L158 Benchmark]: TraceAbstraction took 83198.08ms. Allocated memory was 134.2MB in the beginning and 352.3MB in the end (delta: 218.1MB). Free memory was 98.6MB in the beginning and 296.0MB in the end (delta: -197.4MB). Peak memory consumption was 19.9MB. Max. memory is 16.1GB. [2021-11-25 20:33:17,605 INFO L158 Benchmark]: Witness Printer took 63.86ms. Allocated memory is still 352.3MB. Free memory was 296.0MB in the beginning and 292.9MB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-25 20:33:17,607 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19ms. Allocated memory is still 102.8MB. Free memory was 55.9MB in the beginning and 55.8MB in the end (delta: 84.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 499.32ms. Allocated memory is still 102.8MB. Free memory was 68.8MB in the beginning and 66.9MB in the end (delta: 2.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 52.34ms. Allocated memory is still 102.8MB. Free memory was 66.9MB in the beginning and 64.5MB in the end (delta: 2.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 43.29ms. Allocated memory is still 102.8MB. Free memory was 64.5MB in the beginning and 62.4MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 745.45ms. Allocated memory was 102.8MB in the beginning and 134.2MB in the end (delta: 31.5MB). Free memory was 62.4MB in the beginning and 98.6MB in the end (delta: -36.2MB). Peak memory consumption was 22.8MB. Max. memory is 16.1GB. * TraceAbstraction took 83198.08ms. Allocated memory was 134.2MB in the beginning and 352.3MB in the end (delta: 218.1MB). Free memory was 98.6MB in the beginning and 296.0MB in the end (delta: -197.4MB). Peak memory consumption was 19.9MB. Max. memory is 16.1GB. * Witness Printer took 63.86ms. Allocated memory is still 352.3MB. Free memory was 296.0MB in the beginning and 292.9MB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 565]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L639] const struct node *p1, *p2; [L640] CALL, EXPR create_sll(&p1, &p2) [L588] struct node *list = ((void *)0); VAL [list={5:0}, pp1={7:0}, pp1={7:0}, pp2={6:0}, pp2={6:0}] [L590] CALL chain_node(&list) [L582] CALL, EXPR alloc_node() [L573] struct node *ptr = malloc(sizeof *ptr); [L574] COND FALSE !(!ptr) [L576] ptr->next = ((void *)0) [L577] ptr->prev = ((void *)0) [L578] return ptr; [L582] RET, EXPR alloc_node() [L582] struct node *node = alloc_node(); [L583] EXPR \read(**ppnode) [L583] node->next = *ppnode [L584] *ppnode = node [L590] RET chain_node(&list) VAL [list={5:0}, pp1={7:0}, pp1={7:0}, pp2={6:0}, pp2={6:0}] [L591] COND FALSE !(__VERIFIER_nondet_int()) [L592] EXPR \read(*list) [L592] *pp2 = list [L593] COND FALSE !(__VERIFIER_nondet_int()) [L595] EXPR \read(*list) [L595] *pp1 = list [L597] CALL chain_node(&list) [L582] CALL, EXPR alloc_node() [L573] struct node *ptr = malloc(sizeof *ptr); [L574] COND FALSE !(!ptr) [L576] ptr->next = ((void *)0) [L577] ptr->prev = ((void *)0) [L578] return ptr; [L582] RET, EXPR alloc_node() [L582] struct node *node = alloc_node(); [L583] EXPR \read(**ppnode) [L583] node->next = *ppnode [L584] *ppnode = node [L597] RET chain_node(&list) VAL [list={5:0}, pp1={7:0}, pp1={7:0}, pp2={6:0}, pp2={6:0}] [L598] COND FALSE !(__VERIFIER_nondet_int()) [L599] EXPR \read(*list) [L599] return list; [L588] struct node *list = ((void *)0); [L599] return list; [L640] RET, EXPR create_sll(&p1, &p2) [L640] struct node *list = create_sll(&p1, &p2); [L642] EXPR \read(*p1) [L642] EXPR \read(*p2) VAL [\read(*p1)={-1:0}, \read(*p2)={-1:0}, list={3:0}, p1={7:0}, p2={6:0}] [L642] CALL check_seq_next(p1, p2) VAL [beg={-1:0}, end={-1:0}] [L626] COND FALSE !(!(beg)) VAL [beg={-1:0}, beg={-1:0}, end={-1:0}, end={-1:0}] [L627] COND FALSE !(!(end)) VAL [beg={-1:0}, beg={-1:0}, end={-1:0}, end={-1:0}] [L628] EXPR beg->next [L628] beg = beg->next [L628] COND TRUE end != beg VAL [beg={-1:0}, beg={0:0}, end={-1:0}, end={-1:0}] [L629] COND TRUE !(beg) VAL [beg={-1:0}, beg={0:0}, end={-1:0}, end={-1:0}] [L629] CALL fail() [L565] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 78 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 83.1s, OverallIterations: 6, TraceHistogramMax: 3, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 3.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 459 SdHoareTripleChecker+Valid, 2.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 452 mSDsluCounter, 2383 SdHoareTripleChecker+Invalid, 1.9s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 1005 IncrementalHoareTripleChecker+Unchecked, 2122 mSDsCounter, 203 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 2429 IncrementalHoareTripleChecker+Invalid, 3637 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 203 mSolverCounterUnsat, 420 mSDtfsCounter, 2429 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 329 GetRequests, 160 SyntacticMatches, 5 SemanticMatches, 164 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 1719 ImplicationChecksByTransitivity, 48.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=122occurred in iteration=5, InterpolantAutomatonStates: 59, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 78 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 7.7s InterpolantComputationTime, 241 NumberOfCodeBlocks, 241 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 204 ConstructedInterpolants, 28 QuantifiedInterpolants, 4561 SizeOfPredicates, 106 NumberOfNonLiveVariables, 2008 ConjunctsInSsa, 347 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 23/42 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-11-25 20:33:17,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c0edb10-0adb-4ea7-9634-fdeaf98bf980/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE