./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2c_remove_all.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2c_remove_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cd9bd7b6c1446abd728b90c98a54cb367face4c5994cfeca4979c2dbc50ad4d3 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-dbf71c6-m [2022-10-17 17:43:11,639 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:43:11,642 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:43:11,691 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:43:11,692 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:43:11,699 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:43:11,701 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:43:11,707 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:43:11,709 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:43:11,710 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:43:11,711 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:43:11,713 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:43:11,713 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:43:11,715 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:43:11,716 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:43:11,718 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:43:11,719 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:43:11,720 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:43:11,722 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:43:11,725 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:43:11,726 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:43:11,728 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:43:11,730 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:43:11,731 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:43:11,736 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:43:11,736 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:43:11,737 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:43:11,738 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:43:11,738 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:43:11,739 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:43:11,740 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:43:11,741 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:43:11,742 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:43:11,743 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:43:11,750 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:43:11,751 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:43:11,751 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:43:11,752 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:43:11,752 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:43:11,753 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:43:11,754 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:43:11,755 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-10-17 17:43:11,800 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:43:11,800 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:43:11,801 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:43:11,801 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:43:11,802 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:43:11,806 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:43:11,807 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:43:11,807 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:43:11,807 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:43:11,807 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:43:11,809 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:43:11,809 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:43:11,809 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:43:11,809 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:43:11,809 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:43:11,810 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:43:11,810 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:43:11,810 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:43:11,811 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-10-17 17:43:11,811 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-10-17 17:43:11,812 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:43:11,812 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:43:11,812 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-10-17 17:43:11,813 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:43:11,813 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:43:11,813 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:43:11,813 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-10-17 17:43:11,814 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-10-17 17:43:11,814 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-10-17 17:43:11,818 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:43:11,818 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-10-17 17:43:11,819 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:43:11,819 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:43:11,819 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:43:11,819 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:43:11,820 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:43:11,820 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:43:11,820 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:43:11,820 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:43:11,821 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:43:11,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:43:11,821 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:43:11,821 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd9bd7b6c1446abd728b90c98a54cb367face4c5994cfeca4979c2dbc50ad4d3 [2022-10-17 17:43:12,095 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:43:12,117 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:43:12,120 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:43:12,121 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:43:12,122 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:43:12,124 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/list-simple/sll2c_remove_all.i [2022-10-17 17:43:12,201 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/data/2ad9b55d0/8d453518df02423d9926dc162f0eb9bb/FLAGd68ada48f [2022-10-17 17:43:12,834 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:43:12,835 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/sv-benchmarks/c/list-simple/sll2c_remove_all.i [2022-10-17 17:43:12,859 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/data/2ad9b55d0/8d453518df02423d9926dc162f0eb9bb/FLAGd68ada48f [2022-10-17 17:43:13,055 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/data/2ad9b55d0/8d453518df02423d9926dc162f0eb9bb [2022-10-17 17:43:13,058 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:43:13,060 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:43:13,061 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:43:13,062 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:43:13,069 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:43:13,071 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,073 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51af036e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13, skipping insertion in model container [2022-10-17 17:43:13,074 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,083 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:43:13,146 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:43:13,577 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_d4b6eb02-c147-4278-b161-01373162c5f9/sv-benchmarks/c/list-simple/sll2c_remove_all.i[24082,24095] [2022-10-17 17:43:13,581 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:43:13,593 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:43:13,654 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_d4b6eb02-c147-4278-b161-01373162c5f9/sv-benchmarks/c/list-simple/sll2c_remove_all.i[24082,24095] [2022-10-17 17:43:13,655 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:43:13,689 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:43:13,689 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13 WrapperNode [2022-10-17 17:43:13,689 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:43:13,691 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:43:13,691 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:43:13,691 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:43:13,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,739 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,764 INFO L138 Inliner]: procedures = 126, calls = 36, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 117 [2022-10-17 17:43:13,764 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:43:13,765 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:43:13,765 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:43:13,765 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:43:13,772 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,773 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,777 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,777 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,786 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,790 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,793 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,794 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,798 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:43:13,799 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:43:13,799 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:43:13,799 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:43:13,800 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (1/1) ... [2022-10-17 17:43:13,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:43:13,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:13,832 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:43:13,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:43:13,882 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-10-17 17:43:13,882 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2022-10-17 17:43:13,883 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2022-10-17 17:43:13,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-10-17 17:43:13,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:43:13,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-10-17 17:43:13,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-10-17 17:43:13,883 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-10-17 17:43:13,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-10-17 17:43:13,884 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-10-17 17:43:13,884 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:43:13,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:43:13,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:43:13,995 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:43:13,997 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:43:14,475 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:43:14,514 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:43:14,514 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-10-17 17:43:14,517 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:43:14 BoogieIcfgContainer [2022-10-17 17:43:14,517 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:43:14,520 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:43:14,520 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:43:14,523 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:43:14,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:43:13" (1/3) ... [2022-10-17 17:43:14,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@250d9105 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:43:14, skipping insertion in model container [2022-10-17 17:43:14,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:13" (2/3) ... [2022-10-17 17:43:14,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@250d9105 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:43:14, skipping insertion in model container [2022-10-17 17:43:14,526 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:43:14" (3/3) ... [2022-10-17 17:43:14,527 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_remove_all.i [2022-10-17 17:43:14,546 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:43:14,547 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 42 error locations. [2022-10-17 17:43:14,595 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:43:14,602 INFO L357 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@3ba79dab, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:43:14,603 INFO L358 AbstractCegarLoop]: Starting to check reachability of 42 error locations. [2022-10-17 17:43:14,607 INFO L276 IsEmpty]: Start isEmpty. Operand has 83 states, 37 states have (on average 2.324324324324324) internal successors, (86), 79 states have internal predecessors, (86), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:14,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-10-17 17:43:14,615 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:14,615 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-10-17 17:43:14,616 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:14,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:14,622 INFO L85 PathProgramCache]: Analyzing trace with hash 174313290, now seen corresponding path program 1 times [2022-10-17 17:43:14,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:14,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059117704] [2022-10-17 17:43:14,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:14,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:14,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:14,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:14,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:14,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059117704] [2022-10-17 17:43:14,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059117704] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:14,860 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:43:14,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:43:14,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671533650] [2022-10-17 17:43:14,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:14,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:43:14,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:14,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:43:14,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:43:14,897 INFO L87 Difference]: Start difference. First operand has 83 states, 37 states have (on average 2.324324324324324) internal successors, (86), 79 states have internal predecessors, (86), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:15,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:15,007 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2022-10-17 17:43:15,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:43:15,009 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-10-17 17:43:15,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:15,017 INFO L225 Difference]: With dead ends: 81 [2022-10-17 17:43:15,017 INFO L226 Difference]: Without dead ends: 79 [2022-10-17 17:43:15,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:43:15,023 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 6 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:15,024 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 107 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:43:15,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-10-17 17:43:15,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-10-17 17:43:15,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 75 states have internal predecessors, (79), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:15,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2022-10-17 17:43:15,071 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 5 [2022-10-17 17:43:15,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:15,072 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2022-10-17 17:43:15,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:15,072 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2022-10-17 17:43:15,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-10-17 17:43:15,073 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:15,073 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-10-17 17:43:15,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:43:15,073 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:15,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:15,074 INFO L85 PathProgramCache]: Analyzing trace with hash 174313291, now seen corresponding path program 1 times [2022-10-17 17:43:15,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:15,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912294371] [2022-10-17 17:43:15,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:15,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:15,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:15,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:15,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:15,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912294371] [2022-10-17 17:43:15,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912294371] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:15,203 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:43:15,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:43:15,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797517766] [2022-10-17 17:43:15,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:15,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:43:15,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:15,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:43:15,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:43:15,206 INFO L87 Difference]: Start difference. First operand 79 states and 83 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:15,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:15,312 INFO L93 Difference]: Finished difference Result 77 states and 81 transitions. [2022-10-17 17:43:15,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:43:15,314 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-10-17 17:43:15,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:15,317 INFO L225 Difference]: With dead ends: 77 [2022-10-17 17:43:15,322 INFO L226 Difference]: Without dead ends: 77 [2022-10-17 17:43:15,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:43:15,324 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 2 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:15,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 112 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:43:15,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-10-17 17:43:15,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-10-17 17:43:15,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 36 states have (on average 2.138888888888889) internal successors, (77), 73 states have internal predecessors, (77), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:15,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2022-10-17 17:43:15,334 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 5 [2022-10-17 17:43:15,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:15,334 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2022-10-17 17:43:15,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:15,335 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2022-10-17 17:43:15,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-10-17 17:43:15,335 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:15,336 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:15,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-17 17:43:15,336 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:15,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:15,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1147239271, now seen corresponding path program 1 times [2022-10-17 17:43:15,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:15,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720964156] [2022-10-17 17:43:15,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:15,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:15,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:15,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:15,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:15,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720964156] [2022-10-17 17:43:15,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720964156] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:15,435 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:43:15,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:43:15,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731420608] [2022-10-17 17:43:15,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:15,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:43:15,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:15,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:43:15,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:43:15,438 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 17:43:15,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:15,478 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2022-10-17 17:43:15,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:43:15,481 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-10-17 17:43:15,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:15,482 INFO L225 Difference]: With dead ends: 83 [2022-10-17 17:43:15,482 INFO L226 Difference]: Without dead ends: 83 [2022-10-17 17:43:15,483 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:43:15,484 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 4 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:15,485 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 141 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:43:15,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-10-17 17:43:15,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 78. [2022-10-17 17:43:15,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 37 states have (on average 2.108108108108108) internal successors, (78), 74 states have internal predecessors, (78), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:15,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2022-10-17 17:43:15,498 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 10 [2022-10-17 17:43:15,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:15,498 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2022-10-17 17:43:15,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 17:43:15,499 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2022-10-17 17:43:15,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 17:43:15,499 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:15,500 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:15,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-17 17:43:15,500 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:15,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:15,501 INFO L85 PathProgramCache]: Analyzing trace with hash -667240067, now seen corresponding path program 1 times [2022-10-17 17:43:15,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:15,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222138383] [2022-10-17 17:43:15,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:15,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:15,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:15,735 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-10-17 17:43:15,736 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:15,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222138383] [2022-10-17 17:43:15,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222138383] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:15,738 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:43:15,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:43:15,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334835156] [2022-10-17 17:43:15,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:15,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 17:43:15,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:15,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 17:43:15,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:43:15,743 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-10-17 17:43:15,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:15,970 INFO L93 Difference]: Finished difference Result 129 states and 137 transitions. [2022-10-17 17:43:15,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:43:15,971 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-10-17 17:43:15,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:15,986 INFO L225 Difference]: With dead ends: 129 [2022-10-17 17:43:15,986 INFO L226 Difference]: Without dead ends: 129 [2022-10-17 17:43:15,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-10-17 17:43:15,993 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 60 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:15,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 183 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:43:15,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-10-17 17:43:16,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 77. [2022-10-17 17:43:16,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 37 states have (on average 2.081081081081081) internal successors, (77), 73 states have internal predecessors, (77), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:16,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2022-10-17 17:43:16,005 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 17 [2022-10-17 17:43:16,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:16,006 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2022-10-17 17:43:16,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-10-17 17:43:16,010 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2022-10-17 17:43:16,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 17:43:16,011 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:16,011 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:16,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-10-17 17:43:16,012 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:16,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:16,015 INFO L85 PathProgramCache]: Analyzing trace with hash -667240066, now seen corresponding path program 1 times [2022-10-17 17:43:16,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:16,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823897061] [2022-10-17 17:43:16,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:16,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:16,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:16,379 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:16,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:16,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823897061] [2022-10-17 17:43:16,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823897061] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:16,379 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:43:16,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:43:16,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500549945] [2022-10-17 17:43:16,381 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:16,382 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 17:43:16,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:16,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 17:43:16,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:43:16,386 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-10-17 17:43:16,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:16,547 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2022-10-17 17:43:16,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:43:16,548 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-10-17 17:43:16,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:16,549 INFO L225 Difference]: With dead ends: 77 [2022-10-17 17:43:16,549 INFO L226 Difference]: Without dead ends: 77 [2022-10-17 17:43:16,550 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-10-17 17:43:16,551 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 69 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:16,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 173 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:43:16,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-10-17 17:43:16,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2022-10-17 17:43:16,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 37 states have (on average 2.054054054054054) internal successors, (76), 72 states have internal predecessors, (76), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:16,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2022-10-17 17:43:16,559 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 17 [2022-10-17 17:43:16,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:16,560 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2022-10-17 17:43:16,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-10-17 17:43:16,560 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2022-10-17 17:43:16,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-10-17 17:43:16,561 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:16,561 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:16,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-10-17 17:43:16,562 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:16,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:16,563 INFO L85 PathProgramCache]: Analyzing trace with hash -1267444548, now seen corresponding path program 1 times [2022-10-17 17:43:16,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:16,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267584354] [2022-10-17 17:43:16,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:16,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:16,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:16,804 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:16,804 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:16,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267584354] [2022-10-17 17:43:16,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267584354] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:16,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802282737] [2022-10-17 17:43:16,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:16,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:16,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:16,818 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:16,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:43:16,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:16,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 17 conjunts are in the unsatisfiable core [2022-10-17 17:43:16,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:17,046 INFO L390 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 [2022-10-17 17:43:17,237 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:43:17,237 INFO L390 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 17 treesize of output 21 [2022-10-17 17:43:17,255 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:17,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:17,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802282737] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:17,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [407402074] [2022-10-17 17:43:17,354 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-10-17 17:43:17,355 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:17,359 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:17,364 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:17,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:17,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,422 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-10-17 17:43:17,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,471 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:17,500 INFO L390 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 [2022-10-17 17:43:17,512 INFO L390 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 [2022-10-17 17:43:17,531 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 15 treesize of output 1 [2022-10-17 17:43:17,537 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 11 treesize of output 7 [2022-10-17 17:43:17,552 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 11 treesize of output 7 [2022-10-17 17:43:17,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,571 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 27 treesize of output 11 [2022-10-17 17:43:17,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,584 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 27 treesize of output 11 [2022-10-17 17:43:17,594 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2022-10-17 17:43:17,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,668 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-10-17 17:43:17,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,738 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:17,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:17,823 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-10-17 17:43:18,238 INFO L356 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2022-10-17 17:43:18,239 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 208 treesize of output 197 [2022-10-17 17:43:18,665 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 9 treesize of output 3 [2022-10-17 17:43:18,677 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 13 treesize of output 9 [2022-10-17 17:43:18,690 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:18,703 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:18,714 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:18,729 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:18,731 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:18,734 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:18,736 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:18,737 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:18,844 INFO L356 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2022-10-17 17:43:18,844 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 208 treesize of output 197 [2022-10-17 17:43:19,132 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:19,151 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:19,163 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 9 treesize of output 3 [2022-10-17 17:43:19,196 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:19,207 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 13 treesize of output 9 [2022-10-17 17:43:19,221 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:19,223 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:19,225 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:19,226 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:19,229 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:19,322 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 19 treesize of output 11 [2022-10-17 17:43:19,339 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 11 [2022-10-17 17:43:19,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:19,354 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 23 treesize of output 11 [2022-10-17 17:43:19,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:19,667 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 133 treesize of output 117 [2022-10-17 17:43:19,681 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:19,683 INFO L390 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 0 case distinctions, treesize of input 129 treesize of output 117 [2022-10-17 17:43:19,694 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:19,695 INFO L390 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 0 case distinctions, treesize of input 121 treesize of output 109 [2022-10-17 17:43:20,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:20,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:20,048 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:20,061 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 65 for LOIs [2022-10-17 17:43:20,304 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:24,671 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1026#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (not (= (select |#valid| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 1)) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:24,671 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:24,672 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:43:24,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2022-10-17 17:43:24,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182184693] [2022-10-17 17:43:24,672 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:24,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-10-17 17:43:24,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:24,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-10-17 17:43:24,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=473, Unknown=0, NotChecked=0, Total=552 [2022-10-17 17:43:24,674 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-10-17 17:43:24,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:24,997 INFO L93 Difference]: Finished difference Result 126 states and 133 transitions. [2022-10-17 17:43:24,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 17:43:24,997 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2022-10-17 17:43:24,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:24,999 INFO L225 Difference]: With dead ends: 126 [2022-10-17 17:43:24,999 INFO L226 Difference]: Without dead ends: 126 [2022-10-17 17:43:24,999 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=95, Invalid=555, Unknown=0, NotChecked=0, Total=650 [2022-10-17 17:43:25,000 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 53 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:25,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 320 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 352 Invalid, 0 Unknown, 53 Unchecked, 0.2s Time] [2022-10-17 17:43:25,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-10-17 17:43:25,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 75. [2022-10-17 17:43:25,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 37 states have (on average 2.027027027027027) internal successors, (75), 71 states have internal predecessors, (75), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:25,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2022-10-17 17:43:25,008 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 19 [2022-10-17 17:43:25,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:25,009 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2022-10-17 17:43:25,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-10-17 17:43:25,009 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2022-10-17 17:43:25,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-10-17 17:43:25,010 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:25,010 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:25,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:25,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-10-17 17:43:25,238 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:25,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:25,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1267444547, now seen corresponding path program 1 times [2022-10-17 17:43:25,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:25,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955406700] [2022-10-17 17:43:25,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:25,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:25,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:25,541 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:25,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:25,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955406700] [2022-10-17 17:43:25,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955406700] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:25,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069378038] [2022-10-17 17:43:25,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:25,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:25,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:25,546 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:25,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:43:25,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:25,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 31 conjunts are in the unsatisfiable core [2022-10-17 17:43:25,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:25,663 INFO L390 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 [2022-10-17 17:43:25,668 INFO L390 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 [2022-10-17 17:43:25,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,867 INFO L390 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 14 [2022-10-17 17:43:25,875 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-10-17 17:43:25,875 INFO L390 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-10-17 17:43:25,914 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:25,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:32,120 WARN L233 SmtUtils]: Spent 6.09s on a formula simplification that was a NOOP. DAG size: 22 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-10-17 17:43:32,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069378038] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:32,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1053421097] [2022-10-17 17:43:32,125 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-10-17 17:43:32,125 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:32,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:32,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:32,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:32,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,152 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-10-17 17:43:32,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,182 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:32,197 INFO L390 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 [2022-10-17 17:43:32,202 INFO L390 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 [2022-10-17 17:43:32,211 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 15 treesize of output 1 [2022-10-17 17:43:32,216 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 11 treesize of output 7 [2022-10-17 17:43:32,222 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 11 treesize of output 7 [2022-10-17 17:43:32,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,233 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 27 treesize of output 11 [2022-10-17 17:43:32,239 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2022-10-17 17:43:32,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,247 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 27 treesize of output 11 [2022-10-17 17:43:32,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,301 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-10-17 17:43:32,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,331 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:32,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:32,371 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-10-17 17:43:32,529 INFO L356 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2022-10-17 17:43:32,530 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 208 treesize of output 197 [2022-10-17 17:43:32,794 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:32,804 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:32,814 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:32,825 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:32,836 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:32,850 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:32,853 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:32,855 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:32,856 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:32,941 INFO L356 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2022-10-17 17:43:32,942 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 208 treesize of output 197 [2022-10-17 17:43:33,166 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:33,175 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:33,185 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:33,194 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:33,207 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:33,220 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:33,222 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:33,224 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:33,227 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:33,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:33,279 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 23 treesize of output 11 [2022-10-17 17:43:33,290 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 19 treesize of output 11 [2022-10-17 17:43:33,302 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 11 [2022-10-17 17:43:33,502 INFO L390 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 11 treesize of output 7 [2022-10-17 17:43:33,511 INFO L390 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 11 treesize of output 7 [2022-10-17 17:43:33,520 INFO L390 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 [2022-10-17 17:43:33,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:33,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:33,802 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:33,813 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 65 for LOIs [2022-10-17 17:43:34,037 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:38,218 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1332#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (< (select |#length| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) (+ |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 4)) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:38,219 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:38,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:43:38,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2022-10-17 17:43:38,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787922486] [2022-10-17 17:43:38,219 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:38,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-10-17 17:43:38,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:38,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-10-17 17:43:38,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=773, Unknown=0, NotChecked=0, Total=870 [2022-10-17 17:43:38,221 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-10-17 17:43:38,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:38,771 INFO L93 Difference]: Finished difference Result 126 states and 134 transitions. [2022-10-17 17:43:38,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-10-17 17:43:38,772 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 19 [2022-10-17 17:43:38,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:38,773 INFO L225 Difference]: With dead ends: 126 [2022-10-17 17:43:38,773 INFO L226 Difference]: Without dead ends: 126 [2022-10-17 17:43:38,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=126, Invalid=996, Unknown=0, NotChecked=0, Total=1122 [2022-10-17 17:43:38,775 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 167 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:38,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 265 Invalid, 661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 564 Invalid, 0 Unknown, 88 Unchecked, 0.4s Time] [2022-10-17 17:43:38,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-10-17 17:43:38,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 74. [2022-10-17 17:43:38,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 37 states have (on average 2.0) internal successors, (74), 70 states have internal predecessors, (74), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:38,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2022-10-17 17:43:38,782 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 19 [2022-10-17 17:43:38,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:38,783 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2022-10-17 17:43:38,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-10-17 17:43:38,783 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2022-10-17 17:43:38,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-10-17 17:43:38,784 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:38,784 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:38,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-10-17 17:43:38,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:38,998 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:38,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:38,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1756629474, now seen corresponding path program 1 times [2022-10-17 17:43:38,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:38,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849783351] [2022-10-17 17:43:38,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:38,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:39,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:39,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-10-17 17:43:39,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:39,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849783351] [2022-10-17 17:43:39,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849783351] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:39,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198471105] [2022-10-17 17:43:39,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:39,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:39,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:39,424 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:39,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:43:39,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:39,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 26 conjunts are in the unsatisfiable core [2022-10-17 17:43:39,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:39,540 INFO L390 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 [2022-10-17 17:43:39,561 INFO L390 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 5 treesize of output 3 [2022-10-17 17:43:39,641 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:43:39,641 INFO L390 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 17 treesize of output 21 [2022-10-17 17:43:39,674 INFO L390 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 5 treesize of output 3 [2022-10-17 17:43:39,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,741 INFO L390 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 14 [2022-10-17 17:43:39,753 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:39,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:39,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198471105] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:39,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1500709632] [2022-10-17 17:43:39,825 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-10-17 17:43:39,825 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:39,825 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:39,825 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:39,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:39,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,850 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-10-17 17:43:39,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,874 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:39,887 INFO L390 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 [2022-10-17 17:43:39,893 INFO L390 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 [2022-10-17 17:43:39,909 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 15 treesize of output 1 [2022-10-17 17:43:39,913 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 11 treesize of output 7 [2022-10-17 17:43:39,919 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 11 treesize of output 7 [2022-10-17 17:43:39,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 27 treesize of output 11 [2022-10-17 17:43:39,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,938 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 27 treesize of output 11 [2022-10-17 17:43:39,944 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2022-10-17 17:43:39,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,968 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-10-17 17:43:39,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:39,997 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:40,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:40,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:40,027 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2022-10-17 17:43:40,170 INFO L356 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2022-10-17 17:43:40,170 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 208 treesize of output 197 [2022-10-17 17:43:40,427 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:40,436 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:40,449 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:40,459 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:40,468 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:40,480 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,482 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,483 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,485 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,487 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,563 INFO L356 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2022-10-17 17:43:40,564 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 208 treesize of output 197 [2022-10-17 17:43:40,759 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:40,768 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:40,778 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2022-10-17 17:43:40,787 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:40,797 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2022-10-17 17:43:40,810 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,812 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,817 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,819 WARN L234 Elim1Store]: Array PQE input equivalent to false [2022-10-17 17:43:40,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:40,881 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 23 treesize of output 11 [2022-10-17 17:43:40,891 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 11 [2022-10-17 17:43:40,901 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 19 treesize of output 11 [2022-10-17 17:43:41,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:41,126 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 133 treesize of output 117 [2022-10-17 17:43:41,137 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:41,139 INFO L390 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 0 case distinctions, treesize of input 129 treesize of output 117 [2022-10-17 17:43:41,151 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:41,154 INFO L390 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 0 case distinctions, treesize of input 125 treesize of output 113 [2022-10-17 17:43:41,198 INFO L390 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 11 treesize of output 7 [2022-10-17 17:43:41,209 INFO L390 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 11 treesize of output 7 [2022-10-17 17:43:41,226 INFO L390 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 [2022-10-17 17:43:41,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:41,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:41,505 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 33 [2022-10-17 17:43:41,523 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 65 for LOIs [2022-10-17 17:43:41,767 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:46,257 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1651#(and (<= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= (+ |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 4) (select |#length| |ULTIMATE.start_sll_circular_create_~last~0#1.base|)) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| |ULTIMATE.start_sll_circular_create_#res#1.offset|) (<= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_circular_create_#res#1.offset|) (= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (= |ULTIMATE.start_sll_circular_create_~head~0#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) |ULTIMATE.start_sll_circular_create_~last~0#1.offset|)) (= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.offset| |ULTIMATE.start_sll_circular_remove_first_~head#1.offset|) (not (= (select |#valid| |ULTIMATE.start_sll_circular_remove_first_~head#1.base|) 1)) (<= |ULTIMATE.start_sll_circular_create_#in~len#1| 2) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_sll_circular_create_~last~0#1.offset|) (<= 1 |ULTIMATE.start_sll_circular_create_~data#1|) (<= 0 |ULTIMATE.start_sll_circular_create_~head~0#1.offset|) (= |ULTIMATE.start_sll_circular_remove_first_~head#1.base| |ULTIMATE.start_sll_circular_remove_first_#in~head#1.base|) (<= 1 |ULTIMATE.start_sll_circular_create_#in~data#1|) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) |ULTIMATE.start_sll_circular_create_~last~0#1.offset|)) (= |ULTIMATE.start_sll_circular_remove_first_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.base| |ULTIMATE.start_sll_circular_create_#res#1.base|) (<= |ULTIMATE.start_sll_circular_create_~data#1| 1) (<= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|)) (<= 0 |#NULL.offset|) (= (select |#valid| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 1) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:46,258 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:46,258 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:43:46,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2022-10-17 17:43:46,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664879901] [2022-10-17 17:43:46,258 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:46,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-10-17 17:43:46,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:46,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-10-17 17:43:46,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=807, Unknown=0, NotChecked=0, Total=930 [2022-10-17 17:43:46,260 INFO L87 Difference]: Start difference. First operand 74 states and 78 transitions. Second operand has 16 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-10-17 17:43:46,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:46,668 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2022-10-17 17:43:46,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-10-17 17:43:46,669 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 21 [2022-10-17 17:43:46,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:46,670 INFO L225 Difference]: With dead ends: 119 [2022-10-17 17:43:46,671 INFO L226 Difference]: Without dead ends: 119 [2022-10-17 17:43:46,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=155, Invalid=1035, Unknown=0, NotChecked=0, Total=1190 [2022-10-17 17:43:46,672 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 223 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 136 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:46,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 258 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 356 Invalid, 0 Unknown, 136 Unchecked, 0.3s Time] [2022-10-17 17:43:46,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-10-17 17:43:46,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 72. [2022-10-17 17:43:46,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 40 states have (on average 1.875) internal successors, (75), 68 states have internal predecessors, (75), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:43:46,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 79 transitions. [2022-10-17 17:43:46,679 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 79 transitions. Word has length 21 [2022-10-17 17:43:46,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:46,679 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 79 transitions. [2022-10-17 17:43:46,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-10-17 17:43:46,680 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 79 transitions. [2022-10-17 17:43:46,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-10-17 17:43:46,680 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:46,681 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:46,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:46,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4b6eb02-c147-4278-b161-01373162c5f9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:46,894 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2022-10-17 17:43:46,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:46,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1756629475, now seen corresponding path program 1 times [2022-10-17 17:43:46,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:46,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260128311] [2022-10-17 17:43:46,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:46,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:46,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat