./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0b1cf2dd5b4da09460afcca66f285dbd0591f4fa3369eb070fcfcc2c1d99d315 --- 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-8393723 [2022-11-19 06:34:53,741 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:34:53,743 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:34:53,766 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:34:53,766 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:34:53,768 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:34:53,769 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:34:53,771 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:34:53,773 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:34:53,774 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:34:53,775 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:34:53,777 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:34:53,777 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:34:53,778 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:34:53,780 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:34:53,781 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:34:53,782 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:34:53,783 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:34:53,785 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:34:53,788 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:34:53,789 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:34:53,791 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:34:53,793 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:34:53,794 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:34:53,798 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:34:53,798 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:34:53,799 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:34:53,800 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:34:53,800 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:34:53,802 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:34:53,802 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:34:53,803 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:34:53,804 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:34:53,805 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:34:53,807 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:34:53,807 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:34:53,808 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:34:53,809 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:34:53,809 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:34:53,810 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:34:53,811 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:34:53,813 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:34:53,838 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:34:53,838 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:34:53,839 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:34:53,839 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:34:53,840 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:34:53,840 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:34:53,840 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:34:53,841 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:34:53,841 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:34:53,841 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:34:53,841 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:34:53,842 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:34:53,842 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:34:53,842 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:34:53,842 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:34:53,843 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:34:53,843 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:34:53,843 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:34:53,844 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:34:53,844 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:34:53,844 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:34:53,845 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:34:53,845 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:34:53,845 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:34:53,845 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:34:53,846 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:34:53,846 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:34:53,846 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:34:53,846 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:34:53,847 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:34:53,847 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:34:53,847 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:34:53,847 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:34:53,848 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:34:53,848 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:34:53,848 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:34:53,848 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:34:53,848 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:34:53,849 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:34:53,849 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:34:53,849 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:34:53,849 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_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b1cf2dd5b4da09460afcca66f285dbd0591f4fa3369eb070fcfcc2c1d99d315 [2022-11-19 06:34:54,133 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:34:54,168 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:34:54,171 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:34:54,172 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:34:54,179 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:34:54,185 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i [2022-11-19 06:34:54,270 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/data/5a5a406f1/efb8ea3e5e7d4afcbefaa71bfe61fda5/FLAG83e47c609 [2022-11-19 06:34:54,889 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:34:54,890 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i [2022-11-19 06:34:54,903 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/data/5a5a406f1/efb8ea3e5e7d4afcbefaa71bfe61fda5/FLAG83e47c609 [2022-11-19 06:34:55,210 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/data/5a5a406f1/efb8ea3e5e7d4afcbefaa71bfe61fda5 [2022-11-19 06:34:55,217 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:34:55,220 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:34:55,223 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:34:55,223 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:34:55,228 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:34:55,229 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:55,231 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f9a0f65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55, skipping insertion in model container [2022-11-19 06:34:55,231 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:55,240 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:34:55,300 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:34:55,751 WARN L234 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_c6da30b8-5d00-440e-b532-990666f6a317/sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i[23814,23827] [2022-11-19 06:34:55,756 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:34:55,769 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:34:55,833 WARN L234 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_c6da30b8-5d00-440e-b532-990666f6a317/sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i[23814,23827] [2022-11-19 06:34:55,844 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:34:55,882 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:34:55,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55 WrapperNode [2022-11-19 06:34:55,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:34:55,884 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:34:55,884 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:34:55,884 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:34:55,893 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:55,921 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:55,959 INFO L138 Inliner]: procedures = 125, calls = 15, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 87 [2022-11-19 06:34:55,960 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:34:55,961 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:34:55,961 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:34:55,962 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:34:55,973 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:55,974 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:55,992 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:55,992 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:55,999 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:56,010 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:56,018 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:56,019 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:56,022 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:34:56,029 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:34:56,030 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:34:56,030 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:34:56,031 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (1/1) ... [2022-11-19 06:34:56,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:34:56,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:34:56,075 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:34:56,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:34:56,131 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-19 06:34:56,132 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:34:56,132 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-19 06:34:56,132 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-19 06:34:56,132 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-19 06:34:56,133 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:34:56,133 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:34:56,133 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:34:56,285 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:34:56,287 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:34:56,508 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:34:56,566 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:34:56,567 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-19 06:34:56,570 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:34:56 BoogieIcfgContainer [2022-11-19 06:34:56,570 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:34:56,572 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:34:56,573 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:34:56,593 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:34:56,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:34:55" (1/3) ... [2022-11-19 06:34:56,594 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2496b5df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:34:56, skipping insertion in model container [2022-11-19 06:34:56,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:34:55" (2/3) ... [2022-11-19 06:34:56,595 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2496b5df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:34:56, skipping insertion in model container [2022-11-19 06:34:56,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:34:56" (3/3) ... [2022-11-19 06:34:56,596 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_length_check-2.i [2022-11-19 06:34:56,624 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:34:56,624 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 06:34:56,705 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:34:56,714 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@378a1158, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:34:56,715 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 06:34:56,719 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:56,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-19 06:34:56,726 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:34:56,727 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:34:56,728 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:34:56,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:34:56,736 INFO L85 PathProgramCache]: Analyzing trace with hash -2053014421, now seen corresponding path program 1 times [2022-11-19 06:34:56,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:34:56,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748812215] [2022-11-19 06:34:56,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:34:56,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:34:56,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:34:56,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:34:56,950 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:34:56,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748812215] [2022-11-19 06:34:56,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748812215] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:34:56,952 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:34:56,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 06:34:56,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889754618] [2022-11-19 06:34:56,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:34:56,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-19 06:34:56,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:34:57,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-19 06:34:57,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 06:34:57,008 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:34:57,076 INFO L93 Difference]: Finished difference Result 25 states and 35 transitions. [2022-11-19 06:34:57,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-19 06:34:57,079 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-19 06:34:57,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:34:57,088 INFO L225 Difference]: With dead ends: 25 [2022-11-19 06:34:57,088 INFO L226 Difference]: Without dead ends: 10 [2022-11-19 06:34:57,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 06:34:57,095 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:34:57,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:34:57,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2022-11-19 06:34:57,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2022-11-19 06:34:57,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2022-11-19 06:34:57,142 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2022-11-19 06:34:57,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:34:57,143 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2022-11-19 06:34:57,144 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,144 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2022-11-19 06:34:57,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-19 06:34:57,146 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:34:57,146 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:34:57,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 06:34:57,147 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:34:57,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:34:57,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1050421157, now seen corresponding path program 1 times [2022-11-19 06:34:57,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:34:57,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486631784] [2022-11-19 06:34:57,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:34:57,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:34:57,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:34:57,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:34:57,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:34:57,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486631784] [2022-11-19 06:34:57,325 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486631784] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:34:57,325 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:34:57,325 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 06:34:57,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071822276] [2022-11-19 06:34:57,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:34:57,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 06:34:57,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:34:57,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 06:34:57,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:34:57,329 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:34:57,372 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-19 06:34:57,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 06:34:57,373 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-19 06:34:57,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:34:57,373 INFO L225 Difference]: With dead ends: 16 [2022-11-19 06:34:57,374 INFO L226 Difference]: Without dead ends: 12 [2022-11-19 06:34:57,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:34:57,376 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:34:57,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 6 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:34:57,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-19 06:34:57,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2022-11-19 06:34:57,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-11-19 06:34:57,382 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2022-11-19 06:34:57,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:34:57,383 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-11-19 06:34:57,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,383 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-11-19 06:34:57,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 06:34:57,384 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:34:57,384 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:34:57,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 06:34:57,385 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:34:57,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:34:57,386 INFO L85 PathProgramCache]: Analyzing trace with hash -1615469636, now seen corresponding path program 1 times [2022-11-19 06:34:57,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:34:57,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926955678] [2022-11-19 06:34:57,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:34:57,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:34:57,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:34:57,591 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:34:57,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:34:57,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926955678] [2022-11-19 06:34:57,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926955678] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:34:57,592 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:34:57,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 06:34:57,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021285648] [2022-11-19 06:34:57,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:34:57,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 06:34:57,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:34:57,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 06:34:57,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:34:57,595 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:34:57,674 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2022-11-19 06:34:57,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:34:57,675 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-19 06:34:57,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:34:57,676 INFO L225 Difference]: With dead ends: 16 [2022-11-19 06:34:57,676 INFO L226 Difference]: Without dead ends: 13 [2022-11-19 06:34:57,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-19 06:34:57,678 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 14 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 19 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 [2022-11-19 06:34:57,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 19 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:34:57,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-19 06:34:57,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2022-11-19 06:34:57,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2022-11-19 06:34:57,684 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 10 [2022-11-19 06:34:57,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:34:57,684 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2022-11-19 06:34:57,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:34:57,685 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2022-11-19 06:34:57,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-19 06:34:57,685 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:34:57,686 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:34:57,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-19 06:34:57,686 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:34:57,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:34:57,687 INFO L85 PathProgramCache]: Analyzing trace with hash 1458886540, now seen corresponding path program 1 times [2022-11-19 06:34:57,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:34:57,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116025265] [2022-11-19 06:34:57,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:34:57,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:34:57,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:34:57,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 06:34:57,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:34:57,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116025265] [2022-11-19 06:34:57,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116025265] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:34:57,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061183361] [2022-11-19 06:34:57,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:34:57,870 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:34:57,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:34:57,874 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:34:57,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:34:57,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:34:57,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-19 06:34:58,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:34:58,080 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 06:34:58,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:34:58,152 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 06:34:58,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061183361] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:34:58,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1172956729] [2022-11-19 06:34:58,176 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:34:58,176 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:34:58,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:34:58,188 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:34:58,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:34:58,414 INFO L321 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2022-11-19 06:34:58,415 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 30 [2022-11-19 06:34:58,481 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 06:34:58,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 27 treesize of output 41 [2022-11-19 06:34:58,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 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 [2022-11-19 06:34:58,575 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 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 [2022-11-19 06:34:58,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:34:58,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 30 treesize of output 21 [2022-11-19 06:34:58,718 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 06:34:58,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 06:34:58,741 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-19 06:34:58,949 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:34:58,970 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:34:58,971 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 251 treesize of output 250 [2022-11-19 06:34:59,003 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:34:59,020 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-11-19 06:34:59,021 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 267 treesize of output 266 [2022-11-19 06:34:59,047 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:34:59,062 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-19 06:34:59,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 311 treesize of output 294 [2022-11-19 06:34:59,305 INFO L321 Elim1Store]: treesize reduction 120, result has 17.2 percent of original size [2022-11-19 06:34:59,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 292 treesize of output 297 [2022-11-19 06:34:59,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:34:59,425 INFO L321 Elim1Store]: treesize reduction 164, result has 15.0 percent of original size [2022-11-19 06:34:59,425 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 14 case distinctions, treesize of input 297 treesize of output 305 [2022-11-19 06:34:59,566 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:34:59,581 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:34:59,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 251 treesize of output 250 [2022-11-19 06:34:59,606 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:34:59,628 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-11-19 06:34:59,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 267 treesize of output 266 [2022-11-19 06:34:59,645 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:34:59,658 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-19 06:34:59,659 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 311 treesize of output 294 [2022-11-19 06:34:59,894 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:35:01,071 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '231#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:35:01,071 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:35:01,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:35:01,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2022-11-19 06:35:01,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713675392] [2022-11-19 06:35:01,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:35:01,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 06:35:01,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:35:01,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 06:35:01,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2022-11-19 06:35:01,073 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:01,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:35:01,125 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2022-11-19 06:35:01,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:35:01,126 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-19 06:35:01,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:35:01,126 INFO L225 Difference]: With dead ends: 19 [2022-11-19 06:35:01,126 INFO L226 Difference]: Without dead ends: 14 [2022-11-19 06:35:01,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2022-11-19 06:35:01,128 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:35:01,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 6 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:35:01,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-19 06:35:01,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-19 06:35:01,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:01,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-11-19 06:35:01,133 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2022-11-19 06:35:01,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:35:01,133 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-11-19 06:35:01,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:01,134 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-11-19 06:35:01,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-19 06:35:01,134 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:35:01,134 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:35:01,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 06:35:01,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:01,341 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:35:01,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:35:01,341 INFO L85 PathProgramCache]: Analyzing trace with hash 146542613, now seen corresponding path program 2 times [2022-11-19 06:35:01,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:35:01,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969209770] [2022-11-19 06:35:01,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:01,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:35:01,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:01,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:35:01,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:35:01,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969209770] [2022-11-19 06:35:01,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969209770] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:35:01,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518456089] [2022-11-19 06:35:01,667 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:35:01,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:01,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:35:01,675 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:35:01,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:35:01,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 06:35:01,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:35:01,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-19 06:35:01,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:35:01,851 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:01,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2022-11-19 06:35:01,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:35:01,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:35:01,932 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:35:01,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518456089] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:35:01,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419459118] [2022-11-19 06:35:01,934 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:35:01,935 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:35:01,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:35:01,935 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:35:01,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:35:02,016 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 06:35:02,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 27 treesize of output 41 [2022-11-19 06:35:02,030 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:02,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 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 [2022-11-19 06:35:02,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:35:02,064 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 30 treesize of output 21 [2022-11-19 06:35:02,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 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 [2022-11-19 06:35:02,157 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 06:35:02,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 06:35:02,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-19 06:35:02,268 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:02,282 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:02,282 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 251 treesize of output 250 [2022-11-19 06:35:02,301 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:02,314 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-19 06:35:02,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 263 treesize of output 246 [2022-11-19 06:35:02,327 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:02,340 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:02,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 259 treesize of output 258 [2022-11-19 06:35:02,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:35:02,515 INFO L321 Elim1Store]: treesize reduction 162, result has 16.1 percent of original size [2022-11-19 06:35:02,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 14 case distinctions, treesize of input 289 treesize of output 299 [2022-11-19 06:35:02,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-19 06:35:02,642 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:02,655 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-19 06:35:02,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 255 treesize of output 238 [2022-11-19 06:35:02,673 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:02,686 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:02,687 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 251 treesize of output 250 [2022-11-19 06:35:02,702 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:02,714 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:02,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 259 treesize of output 258 [2022-11-19 06:35:02,884 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:35:04,001 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '374#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:35:04,001 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:35:04,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:35:04,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7] total 10 [2022-11-19 06:35:04,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193450103] [2022-11-19 06:35:04,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:35:04,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 06:35:04,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:35:04,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 06:35:04,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2022-11-19 06:35:04,004 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:04,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:35:04,142 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2022-11-19 06:35:04,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 06:35:04,142 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-19 06:35:04,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:35:04,143 INFO L225 Difference]: With dead ends: 19 [2022-11-19 06:35:04,143 INFO L226 Difference]: Without dead ends: 16 [2022-11-19 06:35:04,144 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2022-11-19 06:35:04,145 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 23 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:35:04,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 39 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:35:04,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-19 06:35:04,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-11-19 06:35:04,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:04,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-11-19 06:35:04,150 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 13 [2022-11-19 06:35:04,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:35:04,150 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-11-19 06:35:04,150 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:04,150 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-11-19 06:35:04,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 06:35:04,151 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:35:04,151 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:35:04,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:35:04,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:04,357 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:35:04,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:35:04,358 INFO L85 PathProgramCache]: Analyzing trace with hash 246691411, now seen corresponding path program 3 times [2022-11-19 06:35:04,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:35:04,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525314560] [2022-11-19 06:35:04,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:04,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:35:04,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:04,513 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 06:35:04,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:35:04,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525314560] [2022-11-19 06:35:04,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525314560] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:35:04,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187026272] [2022-11-19 06:35:04,514 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:35:04,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:04,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:35:04,515 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:35:04,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:35:04,619 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:35:04,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:35:04,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 06:35:04,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:35:04,723 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 06:35:04,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:35:04,797 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 06:35:04,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187026272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:35:04,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [530452786] [2022-11-19 06:35:04,803 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:35:04,803 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:35:04,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:35:04,804 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:35:04,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:35:04,888 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 06:35:04,888 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 27 treesize of output 41 [2022-11-19 06:35:04,899 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:04,923 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 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 [2022-11-19 06:35:04,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:35:04,935 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 30 treesize of output 21 [2022-11-19 06:35:04,949 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 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 [2022-11-19 06:35:05,013 INFO L321 Elim1Store]: treesize reduction 34, result has 41.4 percent of original size [2022-11-19 06:35:05,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 38 [2022-11-19 06:35:05,081 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 06:35:05,082 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 06:35:05,155 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:05,169 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:05,169 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 251 treesize of output 250 [2022-11-19 06:35:05,184 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:05,196 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-19 06:35:05,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 295 treesize of output 278 [2022-11-19 06:35:05,208 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:05,227 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-19 06:35:05,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 291 treesize of output 290 [2022-11-19 06:35:05,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:35:05,412 INFO L321 Elim1Store]: treesize reduction 156, result has 19.2 percent of original size [2022-11-19 06:35:05,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 14 case distinctions, treesize of input 289 treesize of output 305 [2022-11-19 06:35:05,451 INFO L321 Elim1Store]: treesize reduction 79, result has 10.2 percent of original size [2022-11-19 06:35:05,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 284 treesize of output 289 [2022-11-19 06:35:05,550 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:05,565 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-19 06:35:05,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 255 treesize of output 238 [2022-11-19 06:35:05,580 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:05,593 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:05,593 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 251 treesize of output 250 [2022-11-19 06:35:05,607 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:05,620 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:05,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 259 treesize of output 258 [2022-11-19 06:35:05,751 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:35:06,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '531#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:35:06,868 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:35:06,868 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:35:06,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-11-19 06:35:06,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804764864] [2022-11-19 06:35:06,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:35:06,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-19 06:35:06,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:35:06,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-19 06:35:06,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2022-11-19 06:35:06,870 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:06,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:35:06,988 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2022-11-19 06:35:06,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 06:35:06,989 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-19 06:35:06,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:35:06,990 INFO L225 Difference]: With dead ends: 33 [2022-11-19 06:35:06,990 INFO L226 Difference]: Without dead ends: 30 [2022-11-19 06:35:06,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2022-11-19 06:35:06,991 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:35:06,992 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 25 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:35:06,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-19 06:35:06,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2022-11-19 06:35:06,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:06,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2022-11-19 06:35:06,999 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 14 [2022-11-19 06:35:06,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:35:06,999 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2022-11-19 06:35:06,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:06,999 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2022-11-19 06:35:07,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-19 06:35:07,000 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:35:07,000 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:35:07,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 06:35:07,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 06:35:07,201 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:35:07,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:35:07,201 INFO L85 PathProgramCache]: Analyzing trace with hash -943663147, now seen corresponding path program 4 times [2022-11-19 06:35:07,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:35:07,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489053840] [2022-11-19 06:35:07,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:07,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:35:07,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:07,788 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:35:07,788 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:35:07,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489053840] [2022-11-19 06:35:07,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1489053840] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:35:07,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284418116] [2022-11-19 06:35:07,789 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:35:07,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:07,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:35:07,791 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:35:07,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 06:35:07,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:07,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-19 06:35:07,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:35:07,903 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:07,947 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:07,955 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:07,992 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-19 06:35:07,992 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:08,041 INFO L350 Elim1Store]: Elim1 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 18 [2022-11-19 06:35:08,047 INFO L350 Elim1Store]: Elim1 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 23 treesize of output 22 [2022-11-19 06:35:08,205 INFO L321 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2022-11-19 06:35:08,206 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 61 treesize of output 35 [2022-11-19 06:35:08,220 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-19 06:35:08,223 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2022-11-19 06:35:08,228 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:35:08,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:35:18,864 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:35:18,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284418116] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:35:18,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [593628646] [2022-11-19 06:35:18,868 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:35:18,868 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:35:18,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:35:18,869 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:35:18,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:35:18,958 INFO L321 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2022-11-19 06:35:18,959 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 30 [2022-11-19 06:35:19,054 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-19 06:35:19,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 27 treesize of output 41 [2022-11-19 06:35:19,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 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 [2022-11-19 06:35:19,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:35:19,096 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 30 treesize of output 21 [2022-11-19 06:35:19,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 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 [2022-11-19 06:35:19,217 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-19 06:35:19,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-19 06:35:19,237 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-19 06:35:19,304 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:19,324 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-19 06:35:19,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 255 treesize of output 238 [2022-11-19 06:35:19,342 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:19,365 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:19,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 251 treesize of output 250 [2022-11-19 06:35:19,382 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:19,401 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:19,402 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 259 treesize of output 258 [2022-11-19 06:35:19,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:35:19,600 INFO L321 Elim1Store]: treesize reduction 156, result has 19.2 percent of original size [2022-11-19 06:35:19,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 14 case distinctions, treesize of input 289 treesize of output 305 [2022-11-19 06:35:19,644 INFO L321 Elim1Store]: treesize reduction 79, result has 10.2 percent of original size [2022-11-19 06:35:19,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 284 treesize of output 289 [2022-11-19 06:35:19,736 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:19,754 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:19,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 251 treesize of output 250 [2022-11-19 06:35:19,771 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:19,791 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-19 06:35:19,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 291 treesize of output 290 [2022-11-19 06:35:19,808 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:19,826 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-19 06:35:19,827 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 303 treesize of output 286 [2022-11-19 06:35:19,949 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:35:21,649 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '731#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (= |ULTIMATE.start_main_~len~1#1| 2) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:35:21,650 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:35:21,650 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:35:21,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2022-11-19 06:35:21,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491909772] [2022-11-19 06:35:21,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:35:21,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-19 06:35:21,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:35:21,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-19 06:35:21,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=574, Unknown=3, NotChecked=0, Total=650 [2022-11-19 06:35:21,652 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:22,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:35:22,028 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2022-11-19 06:35:22,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-19 06:35:22,030 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-19 06:35:22,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:35:22,030 INFO L225 Difference]: With dead ends: 40 [2022-11-19 06:35:22,031 INFO L226 Difference]: Without dead ends: 33 [2022-11-19 06:35:22,031 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=93, Invalid=716, Unknown=3, NotChecked=0, Total=812 [2022-11-19 06:35:22,032 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:35:22,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 79 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 112 Invalid, 0 Unknown, 32 Unchecked, 0.2s Time] [2022-11-19 06:35:22,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-19 06:35:22,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2022-11-19 06:35:22,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:22,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2022-11-19 06:35:22,043 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 15 [2022-11-19 06:35:22,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:35:22,043 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2022-11-19 06:35:22,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:22,044 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2022-11-19 06:35:22,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-19 06:35:22,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:35:22,044 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:35:22,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 06:35:22,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:22,251 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:35:22,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:35:22,252 INFO L85 PathProgramCache]: Analyzing trace with hash 860644835, now seen corresponding path program 1 times [2022-11-19 06:35:22,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:35:22,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872155494] [2022-11-19 06:35:22,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:22,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:35:22,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:22,368 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 06:35:22,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:35:22,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872155494] [2022-11-19 06:35:22,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872155494] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:35:22,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27830000] [2022-11-19 06:35:22,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:22,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:22,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:35:22,371 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:35:22,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 06:35:22,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:22,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 06:35:22,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:35:22,499 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 06:35:22,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:35:22,555 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 06:35:22,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27830000] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:35:22,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [702375561] [2022-11-19 06:35:22,557 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:35:22,557 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:35:22,558 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:35:22,558 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:35:22,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:35:22,651 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:22,658 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:22,672 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:22,679 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:22,686 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:22,719 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-19 06:35:22,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 12 treesize of output 14 [2022-11-19 06:35:22,752 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:35:22,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-19 06:35:22,787 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:22,801 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:22,831 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:22,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2022-11-19 06:35:22,848 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:22,862 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-19 06:35:22,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 169 treesize of output 168 [2022-11-19 06:35:22,947 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-19 06:35:22,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 162 treesize of output 165 [2022-11-19 06:35:23,022 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-19 06:35:23,023 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 167 treesize of output 180 [2022-11-19 06:35:23,065 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:23,072 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:23,081 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:23,090 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:23,097 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:23,110 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:23,117 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:23,123 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:23,210 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:35:24,195 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '953#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:35:24,196 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:35:24,196 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:35:24,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2022-11-19 06:35:24,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975943737] [2022-11-19 06:35:24,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:35:24,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 06:35:24,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:35:24,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 06:35:24,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-11-19 06:35:24,198 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:24,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:35:24,380 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-11-19 06:35:24,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 06:35:24,381 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-19 06:35:24,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:35:24,381 INFO L225 Difference]: With dead ends: 40 [2022-11-19 06:35:24,381 INFO L226 Difference]: Without dead ends: 34 [2022-11-19 06:35:24,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2022-11-19 06:35:24,383 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 27 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:35:24,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 15 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:35:24,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-19 06:35:24,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2022-11-19 06:35:24,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:24,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2022-11-19 06:35:24,389 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 16 [2022-11-19 06:35:24,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:35:24,389 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2022-11-19 06:35:24,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:24,390 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2022-11-19 06:35:24,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-19 06:35:24,391 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:35:24,391 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:35:24,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 06:35:24,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:24,594 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:35:24,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:35:24,594 INFO L85 PathProgramCache]: Analyzing trace with hash 1521918942, now seen corresponding path program 5 times [2022-11-19 06:35:24,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:35:24,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819217527] [2022-11-19 06:35:24,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:24,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:35:24,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:24,674 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:35:24,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:35:24,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819217527] [2022-11-19 06:35:24,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819217527] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:35:24,675 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:35:24,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 06:35:24,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211047761] [2022-11-19 06:35:24,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:35:24,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 06:35:24,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:35:24,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 06:35:24,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:35:24,677 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:24,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:35:24,757 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-11-19 06:35:24,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 06:35:24,757 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-19 06:35:24,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:35:24,758 INFO L225 Difference]: With dead ends: 34 [2022-11-19 06:35:24,758 INFO L226 Difference]: Without dead ends: 19 [2022-11-19 06:35:24,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-11-19 06:35:24,759 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 11 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:35:24,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 10 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:35:24,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-19 06:35:24,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-19 06:35:24,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:24,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-11-19 06:35:24,764 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2022-11-19 06:35:24,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:35:24,764 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-11-19 06:35:24,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:24,765 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-11-19 06:35:24,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-19 06:35:24,765 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:35:24,765 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:35:24,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-19 06:35:24,765 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:35:24,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:35:24,766 INFO L85 PathProgramCache]: Analyzing trace with hash -1400188742, now seen corresponding path program 2 times [2022-11-19 06:35:24,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:35:24,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813329913] [2022-11-19 06:35:24,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:24,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:35:24,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:25,205 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:35:25,205 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:35:25,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813329913] [2022-11-19 06:35:25,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813329913] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:35:25,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552695147] [2022-11-19 06:35:25,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:35:25,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:25,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:35:25,211 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:35:25,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 06:35:25,329 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 06:35:25,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:35:25,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-19 06:35:25,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:35:25,350 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:25,390 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:25,448 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-19 06:35:25,448 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:25,502 INFO L350 Elim1Store]: Elim1 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 20 treesize of output 19 [2022-11-19 06:35:25,516 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:25,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-19 06:35:25,679 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-19 06:35:25,679 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 15 [2022-11-19 06:35:25,686 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:35:25,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:35:25,938 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:35:25,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552695147] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:35:25,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [992037743] [2022-11-19 06:35:25,940 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:35:25,940 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:35:25,941 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:35:25,941 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:35:25,941 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:35:26,049 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,055 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,071 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,079 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,086 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,128 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:35:26,128 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-19 06:35:26,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 [2022-11-19 06:35:26,173 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,190 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:26,205 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:26,206 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2022-11-19 06:35:26,219 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:26,239 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:26,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 145 treesize of output 144 [2022-11-19 06:35:26,335 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-19 06:35:26,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 167 treesize of output 180 [2022-11-19 06:35:26,359 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-19 06:35:26,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 162 treesize of output 165 [2022-11-19 06:35:26,399 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,405 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,411 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,422 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,431 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,442 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,462 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,469 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:26,550 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:35:27,615 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1292#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:35:27,615 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:35:27,615 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:35:27,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2022-11-19 06:35:27,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926831637] [2022-11-19 06:35:27,616 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:35:27,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 06:35:27,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:35:27,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 06:35:27,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2022-11-19 06:35:27,618 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:28,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:35:28,279 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2022-11-19 06:35:28,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 06:35:28,283 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-19 06:35:28,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:35:28,284 INFO L225 Difference]: With dead ends: 24 [2022-11-19 06:35:28,284 INFO L226 Difference]: Without dead ends: 21 [2022-11-19 06:35:28,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=195, Invalid=995, Unknown=0, NotChecked=0, Total=1190 [2022-11-19 06:35:28,286 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 18 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:35:28,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 74 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 91 Invalid, 0 Unknown, 27 Unchecked, 0.2s Time] [2022-11-19 06:35:28,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-19 06:35:28,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-11-19 06:35:28,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:28,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-11-19 06:35:28,293 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2022-11-19 06:35:28,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:35:28,294 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-11-19 06:35:28,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:28,295 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-11-19 06:35:28,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-19 06:35:28,295 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:35:28,295 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:35:28,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 06:35:28,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:28,503 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:35:28,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:35:28,503 INFO L85 PathProgramCache]: Analyzing trace with hash -457340338, now seen corresponding path program 3 times [2022-11-19 06:35:28,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:35:28,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353506771] [2022-11-19 06:35:28,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:28,504 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:35:28,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:28,742 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 06:35:28,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:35:28,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353506771] [2022-11-19 06:35:28,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353506771] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:35:28,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191569699] [2022-11-19 06:35:28,743 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:35:28,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:28,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:35:28,745 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:35:28,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 06:35:28,867 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:35:28,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:35:28,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 06:35:28,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:35:29,192 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:35:29,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:35:29,484 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:35:29,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191569699] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:35:29,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [603850213] [2022-11-19 06:35:29,487 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:35:29,488 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:35:29,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:35:29,488 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:35:29,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:35:29,609 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:29,617 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:29,632 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:29,642 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:29,653 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:29,696 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:35:29,696 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-19 06:35:29,706 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 [2022-11-19 06:35:29,761 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:29,779 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:35:29,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2022-11-19 06:35:29,792 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:29,808 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-19 06:35:29,808 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 169 treesize of output 168 [2022-11-19 06:35:29,847 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:29,947 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-19 06:35:29,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 175 treesize of output 188 [2022-11-19 06:35:29,975 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-19 06:35:29,976 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 173 [2022-11-19 06:35:30,041 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:30,046 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:30,053 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:30,065 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:30,073 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:30,086 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:30,092 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:30,098 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:30,221 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:35:31,234 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1512#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:35:31,235 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:35:31,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:35:31,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12] total 21 [2022-11-19 06:35:31,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888767893] [2022-11-19 06:35:31,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:35:31,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 06:35:31,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:35:31,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 06:35:31,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=685, Unknown=0, NotChecked=0, Total=812 [2022-11-19 06:35:31,237 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:31,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:35:31,750 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2022-11-19 06:35:31,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 06:35:31,751 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-19 06:35:31,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:35:31,751 INFO L225 Difference]: With dead ends: 41 [2022-11-19 06:35:31,752 INFO L226 Difference]: Without dead ends: 38 [2022-11-19 06:35:31,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=235, Invalid=1097, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 06:35:31,753 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 49 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:35:31,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 31 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 06:35:31,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-19 06:35:31,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2022-11-19 06:35:31,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:31,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2022-11-19 06:35:31,762 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 19 [2022-11-19 06:35:31,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:35:31,769 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2022-11-19 06:35:31,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:35:31,769 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2022-11-19 06:35:31,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 06:35:31,771 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:35:31,771 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:35:31,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 06:35:31,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-19 06:35:31,978 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:35:31,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:35:31,979 INFO L85 PathProgramCache]: Analyzing trace with hash -1293810886, now seen corresponding path program 4 times [2022-11-19 06:35:31,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:35:31,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912261588] [2022-11-19 06:35:31,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:35:31,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:35:31,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:33,169 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:35:33,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:35:33,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912261588] [2022-11-19 06:35:33,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912261588] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:35:33,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935035907] [2022-11-19 06:35:33,170 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:35:33,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:35:33,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:35:33,171 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:35:33,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 06:35:33,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:35:33,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-19 06:35:33,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:35:33,308 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:33,322 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:33,333 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:33,367 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:35:33,367 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:35:33,459 INFO L350 Elim1Store]: Elim1 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 18 [2022-11-19 06:35:33,469 INFO L350 Elim1Store]: Elim1 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 23 treesize of output 22 [2022-11-19 06:35:33,566 INFO L321 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2022-11-19 06:35:33,566 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 22 [2022-11-19 06:35:33,672 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-19 06:35:33,672 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 43 [2022-11-19 06:35:33,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:35:33,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 40 [2022-11-19 06:35:34,085 INFO L321 Elim1Store]: treesize reduction 85, result has 11.5 percent of original size [2022-11-19 06:35:34,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 9 new quantified variables, introduced 10 case distinctions, treesize of input 132 treesize of output 74 [2022-11-19 06:35:34,108 INFO L321 Elim1Store]: treesize reduction 10, result has 41.2 percent of original size [2022-11-19 06:35:34,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 2 case distinctions, treesize of input 37 treesize of output 25 [2022-11-19 06:35:34,145 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:35:34,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:35:54,396 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:35:54,399 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 4502 treesize of output 4246 [2022-11-19 06:35:54,410 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:01,084 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:01,087 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1034 treesize of output 970 [2022-11-19 06:36:01,094 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:02,035 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:36:02,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935035907] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:36:02,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [173605433] [2022-11-19 06:36:02,037 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:36:02,038 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:36:02,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:36:02,038 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:36:02,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:36:02,141 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,148 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,160 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,166 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,174 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,213 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:36:02,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-19 06:36:02,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 [2022-11-19 06:36:02,266 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,277 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:02,293 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:36:02,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2022-11-19 06:36:02,305 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:02,323 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-11-19 06:36:02,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 153 treesize of output 152 [2022-11-19 06:36:02,427 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-19 06:36:02,427 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 175 treesize of output 188 [2022-11-19 06:36:02,445 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-19 06:36:02,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 173 [2022-11-19 06:36:02,485 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,490 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,496 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,506 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,514 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,527 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,533 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,538 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:02,628 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:36:03,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1792#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:36:03,855 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:36:03,855 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:36:03,856 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 31 [2022-11-19 06:36:03,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928869825] [2022-11-19 06:36:03,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:36:03,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-19 06:36:03,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:36:03,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-19 06:36:03,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1288, Unknown=6, NotChecked=0, Total=1406 [2022-11-19 06:36:03,862 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:04,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:36:04,317 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2022-11-19 06:36:04,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 06:36:04,317 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-19 06:36:04,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:36:04,318 INFO L225 Difference]: With dead ends: 49 [2022-11-19 06:36:04,318 INFO L226 Difference]: Without dead ends: 41 [2022-11-19 06:36:04,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 23.1s TimeCoverageRelationStatistics Valid=136, Invalid=1498, Unknown=6, NotChecked=0, Total=1640 [2022-11-19 06:36:04,319 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 16 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:36:04,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 86 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 152 Invalid, 0 Unknown, 56 Unchecked, 0.2s Time] [2022-11-19 06:36:04,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-19 06:36:04,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2022-11-19 06:36:04,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 38 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:04,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2022-11-19 06:36:04,344 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 20 [2022-11-19 06:36:04,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:36:04,344 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2022-11-19 06:36:04,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:04,345 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2022-11-19 06:36:04,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-19 06:36:04,348 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:36:04,348 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:36:04,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 06:36:04,568 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-19 06:36:04,568 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:36:04,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:36:04,570 INFO L85 PathProgramCache]: Analyzing trace with hash 145003710, now seen corresponding path program 5 times [2022-11-19 06:36:04,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:36:04,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000838307] [2022-11-19 06:36:04,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:04,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:36:04,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:04,717 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:36:04,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:36:04,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000838307] [2022-11-19 06:36:04,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000838307] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:36:04,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904741525] [2022-11-19 06:36:04,718 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:36:04,718 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:04,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:04,719 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:36:04,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 06:36:04,855 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 06:36:04,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:36:04,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 06:36:04,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:36:04,897 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:36:04,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:36:04,988 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:36:04,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904741525] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:36:04,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089844788] [2022-11-19 06:36:04,990 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:36:04,991 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:36:04,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:36:04,991 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:36:04,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:36:05,083 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,089 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,101 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,108 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,114 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,155 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:36:05,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-19 06:36:05,167 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 [2022-11-19 06:36:05,204 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,213 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:05,229 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:36:05,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2022-11-19 06:36:05,239 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:05,256 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-19 06:36:05,256 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 169 treesize of output 168 [2022-11-19 06:36:05,328 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-19 06:36:05,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 170 treesize of output 173 [2022-11-19 06:36:05,389 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-19 06:36:05,390 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 175 treesize of output 188 [2022-11-19 06:36:05,428 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,434 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,442 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,453 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,461 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,475 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,481 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,488 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:05,566 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:36:06,489 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2074#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:36:06,489 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:36:06,489 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:36:06,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 8 [2022-11-19 06:36:06,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001307905] [2022-11-19 06:36:06,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:36:06,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-19 06:36:06,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:36:06,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-19 06:36:06,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2022-11-19 06:36:06,491 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:06,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:36:06,714 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2022-11-19 06:36:06,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 06:36:06,715 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-19 06:36:06,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:36:06,716 INFO L225 Difference]: With dead ends: 49 [2022-11-19 06:36:06,716 INFO L226 Difference]: Without dead ends: 42 [2022-11-19 06:36:06,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 48 SyntacticMatches, 7 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=122, Invalid=384, Unknown=0, NotChecked=0, Total=506 [2022-11-19 06:36:06,717 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 46 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:36:06,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 21 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:36:06,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-19 06:36:06,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2022-11-19 06:36:06,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:06,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-11-19 06:36:06,731 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 21 [2022-11-19 06:36:06,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:36:06,732 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-11-19 06:36:06,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:06,733 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-11-19 06:36:06,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-19 06:36:06,735 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:36:06,735 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:36:06,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 06:36:06,941 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 06:36:06,942 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:36:06,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:36:06,942 INFO L85 PathProgramCache]: Analyzing trace with hash 1051798161, now seen corresponding path program 6 times [2022-11-19 06:36:06,942 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:36:06,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679978791] [2022-11-19 06:36:06,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:06,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:36:06,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:07,052 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:36:07,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:36:07,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679978791] [2022-11-19 06:36:07,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679978791] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:36:07,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362379724] [2022-11-19 06:36:07,053 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:36:07,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:07,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:07,054 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:36:07,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 06:36:07,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:36:07,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:36:07,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 06:36:07,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:36:07,238 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:36:07,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:36:07,292 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:36:07,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362379724] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:36:07,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [87679127] [2022-11-19 06:36:07,294 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:36:07,294 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:36:07,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:36:07,295 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:36:07,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:36:07,376 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,391 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,406 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,422 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,430 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,457 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-19 06:36:07,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 12 treesize of output 14 [2022-11-19 06:36:07,487 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:36:07,487 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-19 06:36:07,523 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,542 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:07,556 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:36:07,556 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2022-11-19 06:36:07,566 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:07,579 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2022-11-19 06:36:07,580 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 153 treesize of output 152 [2022-11-19 06:36:07,646 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-19 06:36:07,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 170 treesize of output 173 [2022-11-19 06:36:07,714 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-19 06:36:07,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 175 treesize of output 188 [2022-11-19 06:36:07,751 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,757 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,763 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,774 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,781 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,792 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,797 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,802 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:07,876 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:36:08,676 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2361#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:36:08,676 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:36:08,676 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:36:08,676 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 7 [2022-11-19 06:36:08,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910727025] [2022-11-19 06:36:08,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:36:08,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-19 06:36:08,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:36:08,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-19 06:36:08,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2022-11-19 06:36:08,678 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:08,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:36:08,806 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-11-19 06:36:08,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 06:36:08,807 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-19 06:36:08,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:36:08,807 INFO L225 Difference]: With dead ends: 42 [2022-11-19 06:36:08,807 INFO L226 Difference]: Without dead ends: 24 [2022-11-19 06:36:08,808 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2022-11-19 06:36:08,808 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 11 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:36:08,809 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 12 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:36:08,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-19 06:36:08,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-19 06:36:08,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:08,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-11-19 06:36:08,823 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 22 [2022-11-19 06:36:08,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:36:08,823 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-11-19 06:36:08,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:08,824 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-11-19 06:36:08,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-19 06:36:08,826 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:36:08,826 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:36:08,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 06:36:09,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 06:36:09,033 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:36:09,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:36:09,033 INFO L85 PathProgramCache]: Analyzing trace with hash -241251705, now seen corresponding path program 7 times [2022-11-19 06:36:09,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:36:09,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922093276] [2022-11-19 06:36:09,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:09,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:36:09,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:09,715 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:36:09,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:36:09,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922093276] [2022-11-19 06:36:09,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922093276] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:36:09,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671394464] [2022-11-19 06:36:09,716 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:36:09,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:09,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:09,717 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:36:09,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 06:36:09,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:09,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-19 06:36:09,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:36:09,857 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:09,908 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:09,986 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:36:09,986 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:10,064 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:10,076 INFO L350 Elim1Store]: Elim1 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 20 treesize of output 19 [2022-11-19 06:36:10,154 INFO L321 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2022-11-19 06:36:10,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 22 [2022-11-19 06:36:10,252 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-19 06:36:10,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 37 [2022-11-19 06:36:10,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:36:10,271 INFO L350 Elim1Store]: Elim1 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 23 treesize of output 22 [2022-11-19 06:36:10,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:36:10,499 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-19 06:36:10,499 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 27 [2022-11-19 06:36:10,580 INFO L321 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2022-11-19 06:36:10,580 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 26 [2022-11-19 06:36:10,585 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:36:10,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:36:20,085 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:20,470 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:36:20,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671394464] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:36:20,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1156470995] [2022-11-19 06:36:20,473 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:36:20,473 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:36:20,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:36:20,474 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:36:20,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:36:20,571 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,577 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,591 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,600 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,608 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,652 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:36:20,652 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-19 06:36:20,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 [2022-11-19 06:36:20,700 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,710 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:20,729 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:36:20,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2022-11-19 06:36:20,739 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:20,759 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-19 06:36:20,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 169 treesize of output 168 [2022-11-19 06:36:20,861 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-19 06:36:20,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 175 treesize of output 188 [2022-11-19 06:36:20,878 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-19 06:36:20,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 173 [2022-11-19 06:36:20,925 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,931 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,938 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,949 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,960 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,972 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,979 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:20,986 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:21,066 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:36:22,236 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2639#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:36:22,236 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:36:22,236 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:36:22,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2022-11-19 06:36:22,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848080527] [2022-11-19 06:36:22,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:36:22,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-19 06:36:22,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:36:22,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-19 06:36:22,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1084, Unknown=2, NotChecked=0, Total=1190 [2022-11-19 06:36:22,239 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:25,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:36:25,302 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2022-11-19 06:36:25,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-19 06:36:25,303 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-19 06:36:25,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:36:25,303 INFO L225 Difference]: With dead ends: 29 [2022-11-19 06:36:25,303 INFO L226 Difference]: Without dead ends: 26 [2022-11-19 06:36:25,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=279, Invalid=1699, Unknown=2, NotChecked=0, Total=1980 [2022-11-19 06:36:25,305 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 25 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:36:25,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 103 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 141 Invalid, 0 Unknown, 49 Unchecked, 0.2s Time] [2022-11-19 06:36:25,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-19 06:36:25,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-11-19 06:36:25,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:25,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-11-19 06:36:25,314 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 23 [2022-11-19 06:36:25,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:36:25,314 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-11-19 06:36:25,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:25,315 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-11-19 06:36:25,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-19 06:36:25,315 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:36:25,315 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:36:25,323 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-19 06:36:25,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 06:36:25,520 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:36:25,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:36:25,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1109969441, now seen corresponding path program 8 times [2022-11-19 06:36:25,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:36:25,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538956966] [2022-11-19 06:36:25,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:25,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:36:25,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:25,823 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-19 06:36:25,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:36:25,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538956966] [2022-11-19 06:36:25,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538956966] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:36:25,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860801735] [2022-11-19 06:36:25,824 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:36:25,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:25,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:25,826 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:36:25,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 06:36:25,946 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 06:36:25,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:36:25,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-19 06:36:25,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:36:26,227 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-19 06:36:26,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:36:26,431 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-19 06:36:26,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860801735] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:36:26,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1637842312] [2022-11-19 06:36:26,433 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 06:36:26,433 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:36:26,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:36:26,433 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:36:26,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:36:26,517 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,525 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,536 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,542 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,551 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,587 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:36:26,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-19 06:36:26,597 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 [2022-11-19 06:36:26,630 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:26,646 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-19 06:36:26,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 137 treesize of output 136 [2022-11-19 06:36:26,668 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:36:26,684 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-19 06:36:26,685 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 169 treesize of output 168 [2022-11-19 06:36:26,708 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,771 INFO L321 Elim1Store]: treesize reduction 52, result has 22.4 percent of original size [2022-11-19 06:36:26,771 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 170 treesize of output 173 [2022-11-19 06:36:26,835 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-19 06:36:26,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 175 treesize of output 188 [2022-11-19 06:36:26,880 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,886 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,895 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,912 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,918 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,933 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,939 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:26,946 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:27,026 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:36:28,023 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2904#(and (<= 0 |ULTIMATE.start_main_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_~len~1#1|) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 |ULTIMATE.start_sll_length_#in~head#1.offset|) (<= |ULTIMATE.start_sll_length_#in~head#1.offset| 0) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~new_head~0#1.offset|) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_create_~new_head~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= |ULTIMATE.start_main_~s~0#1.offset| 0) (not (= |ULTIMATE.start_sll_length_#res#1| |ULTIMATE.start_main_~len~1#1|)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-19 06:36:28,023 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:36:28,023 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:36:28,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-11-19 06:36:28,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745407071] [2022-11-19 06:36:28,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:36:28,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-19 06:36:28,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:36:28,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-19 06:36:28,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2022-11-19 06:36:28,025 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:28,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:36:28,268 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2022-11-19 06:36:28,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 06:36:28,268 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-19 06:36:28,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:36:28,269 INFO L225 Difference]: With dead ends: 49 [2022-11-19 06:36:28,269 INFO L226 Difference]: Without dead ends: 46 [2022-11-19 06:36:28,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2022-11-19 06:36:28,270 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:36:28,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 40 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:36:28,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-19 06:36:28,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2022-11-19 06:36:28,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.135135135135135) internal successors, (42), 37 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:28,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2022-11-19 06:36:28,284 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 24 [2022-11-19 06:36:28,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:36:28,284 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2022-11-19 06:36:28,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 06:36:28,284 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2022-11-19 06:36:28,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-19 06:36:28,285 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:36:28,285 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:36:28,291 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-19 06:36:28,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 06:36:28,490 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:36:28,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:36:28,491 INFO L85 PathProgramCache]: Analyzing trace with hash 48152007, now seen corresponding path program 9 times [2022-11-19 06:36:28,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:36:28,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459210114] [2022-11-19 06:36:28,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:36:28,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:36:28,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:36:30,726 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:36:30,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:36:30,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459210114] [2022-11-19 06:36:30,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459210114] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:36:30,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500872358] [2022-11-19 06:36:30,727 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:36:30,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:36:30,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:36:30,731 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:36:30,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6da30b8-5d00-440e-b532-990666f6a317/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 06:36:30,872 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:36:30,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:36:30,876 WARN L261 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-19 06:36:30,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:36:30,901 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:30,913 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:30,928 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:30,970 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-19 06:36:30,970 INFO L350 Elim1Store]: Elim1 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 [2022-11-19 06:36:31,069 INFO L350 Elim1Store]: Elim1 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 18 [2022-11-19 06:36:31,082 INFO L350 Elim1Store]: Elim1 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 23 treesize of output 22 [2022-11-19 06:36:31,191 INFO L321 Elim1Store]: treesize reduction 48, result has 36.0 percent of original size [2022-11-19 06:36:31,191 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 41 [2022-11-19 06:36:31,324 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-19 06:36:31,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 59 treesize of output 48 [2022-11-19 06:36:31,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 40 [2022-11-19 06:36:31,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:36:31,484 INFO L321 Elim1Store]: treesize reduction 12, result has 67.6 percent of original size [2022-11-19 06:36:31,484 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 37 [2022-11-19 06:36:31,638 INFO L321 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2022-11-19 06:36:31,639 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 101 treesize of output 68 [2022-11-19 06:36:31,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 06:36:31,655 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 62 [2022-11-19 06:36:32,342 INFO L321 Elim1Store]: treesize reduction 194, result has 10.2 percent of original size [2022-11-19 06:36:32,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 14 new quantified variables, introduced 21 case distinctions, treesize of input 251 treesize of output 121 [2022-11-19 06:36:32,374 INFO L321 Elim1Store]: treesize reduction 15, result has 40.0 percent of original size [2022-11-19 06:36:32,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 6 disjoint index pairs (out of 21 index pairs), introduced 10 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 34 [2022-11-19 06:36:32,431 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 5 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:36:32,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:36:34,911 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_82| Int)) (or (= (let ((.cse3 (store |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82| (store (select |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82|) 0 |c_ULTIMATE.start_sll_create_~head~0#1.offset|))) (.cse0 (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82| (store (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82|) 0 |c_ULTIMATE.start_sll_create_~head~0#1.base|)))) (let ((.cse1 (select (select .cse0 |c_ULTIMATE.start_sll_create_~head~0#1.base|) |c_ULTIMATE.start_sll_create_~head~0#1.offset|)) (.cse2 (select (select .cse3 |c_ULTIMATE.start_sll_create_~head~0#1.base|) |c_ULTIMATE.start_sll_create_~head~0#1.offset|))) (select (select .cse0 (select (select .cse0 .cse1) .cse2)) (select (select .cse3 .cse1) .cse2)))) 0) (not (= (select |c_#valid| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82|) 0)))) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_82| Int)) (or (= 0 (let ((.cse4 (store |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82| (store (select |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82|) 0 |c_ULTIMATE.start_sll_create_~head~0#1.offset|))) (.cse5 (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82| (store (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82|) 0 |c_ULTIMATE.start_sll_create_~head~0#1.base|)))) (let ((.cse6 (select (select .cse5 |c_ULTIMATE.start_sll_create_~head~0#1.base|) |c_ULTIMATE.start_sll_create_~head~0#1.offset|)) (.cse7 (select (select .cse4 |c_ULTIMATE.start_sll_create_~head~0#1.base|) |c_ULTIMATE.start_sll_create_~head~0#1.offset|))) (select (select .cse4 (select (select .cse5 .cse6) .cse7)) (select (select .cse4 .cse6) .cse7))))) (not (= (select |c_#valid| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_82|) 0))))) is different from false [2022-11-19 06:37:01,366 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:01,367 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:01,370 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:01,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5094 treesize of output 4838 [2022-11-19 06:37:01,384 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:01,385 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:01,386 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:01,967 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:01,967 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:01,979 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:37:03,862 INFO L321 Elim1Store]: treesize reduction 1149, result has 28.3 percent of original size [2022-11-19 06:37:03,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 13 case distinctions, treesize of input 37256185 treesize of output 35145153 [2022-11-19 06:41:03,634 WARN L233 SmtUtils]: Spent 4.00m on a formula simplification. DAG size of input: 1132 DAG size of output: 1089 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:41:13,841 WARN L233 SmtUtils]: Spent 10.20s on a formula simplification that was a NOOP. DAG size: 1083 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:41:13,902 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:41:13,902 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:41:13,908 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 06:42:04,677 WARN L233 SmtUtils]: Spent 50.76s on a formula simplification. DAG size of input: 482 DAG size of output: 425 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:42:13,214 WARN L233 SmtUtils]: Spent 5.72s on a formula simplification that was a NOOP. DAG size: 378 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:42:37,316 WARN L233 SmtUtils]: Spent 19.08s on a formula simplification. DAG size of input: 374 DAG size of output: 375 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:42:51,703 WARN L233 SmtUtils]: Spent 11.89s on a formula simplification. DAG size of input: 374 DAG size of output: 374 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:45:07,760 WARN L233 SmtUtils]: Spent 32.88s on a formula simplification. DAG size of input: 372 DAG size of output: 374 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:45:29,382 WARN L233 SmtUtils]: Spent 15.31s on a formula simplification. DAG size of input: 374 DAG size of output: 374 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:45:49,816 WARN L233 SmtUtils]: Spent 13.81s on a formula simplification. DAG size of input: 372 DAG size of output: 373 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:46:25,673 WARN L233 SmtUtils]: Spent 30.70s on a formula simplification. DAG size of input: 372 DAG size of output: 374 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:46:45,546 WARN L233 SmtUtils]: Spent 14.13s on a formula simplification. DAG size of input: 374 DAG size of output: 374 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:47:03,542 WARN L233 SmtUtils]: Spent 12.64s on a formula simplification. DAG size of input: 372 DAG size of output: 373 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:47:21,202 WARN L233 SmtUtils]: Spent 12.59s on a formula simplification. DAG size of input: 372 DAG size of output: 373 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:47:52,285 WARN L233 SmtUtils]: Spent 28.48s on a formula simplification. DAG size of input: 372 DAG size of output: 374 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:48:23,403 WARN L233 SmtUtils]: Spent 23.87s on a formula simplification. DAG size of input: 372 DAG size of output: 374 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:48:53,585 WARN L233 SmtUtils]: Spent 22.76s on a formula simplification. DAG size of input: 372 DAG size of output: 374 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:49:44,053 WARN L233 SmtUtils]: Spent 12.45s on a formula simplification. DAG size of input: 365 DAG size of output: 366 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-19 06:49:58,940 WARN L233 SmtUtils]: Spent 12.52s on a formula simplification. DAG size of input: 365 DAG size of output: 366 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)