./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 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_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh --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 ca2dcd06e0389cf665904adfee9ccd6a1a268c87541d3b3b3e0bcffb3a75664e --- 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-2329fc7 [2022-12-14 07:15:03,571 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 07:15:03,573 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 07:15:03,597 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 07:15:03,597 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 07:15:03,599 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 07:15:03,601 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 07:15:03,603 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 07:15:03,606 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 07:15:03,607 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 07:15:03,608 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 07:15:03,610 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 07:15:03,610 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 07:15:03,612 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 07:15:03,613 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 07:15:03,615 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 07:15:03,616 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 07:15:03,617 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 07:15:03,620 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 07:15:03,622 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 07:15:03,625 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 07:15:03,626 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 07:15:03,626 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 07:15:03,627 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 07:15:03,629 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 07:15:03,629 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 07:15:03,629 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 07:15:03,630 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 07:15:03,630 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 07:15:03,630 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 07:15:03,631 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 07:15:03,631 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 07:15:03,631 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 07:15:03,632 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 07:15:03,633 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 07:15:03,633 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 07:15:03,633 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 07:15:03,633 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 07:15:03,633 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 07:15:03,634 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 07:15:03,634 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 07:15:03,635 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 07:15:03,648 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 07:15:03,648 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 07:15:03,649 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 07:15:03,649 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 07:15:03,649 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 07:15:03,649 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 07:15:03,650 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 07:15:03,650 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 07:15:03,650 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 07:15:03,650 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 07:15:03,650 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 07:15:03,650 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 07:15:03,650 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 07:15:03,651 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 07:15:03,651 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 07:15:03,651 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 07:15:03,651 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 07:15:03,651 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 07:15:03,652 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 07:15:03,652 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 07:15:03,652 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 07:15:03,652 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 07:15:03,652 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 07:15:03,652 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 07:15:03,652 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 07:15:03,653 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 07:15:03,653 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 07:15:03,653 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 07:15:03,653 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 07:15:03,653 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 07:15:03,653 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 07:15:03,653 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 07:15:03,654 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 07:15:03,654 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 07:15:03,654 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 07:15:03,654 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 07:15:03,654 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 07:15:03,654 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 07:15:03,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 07:15:03,655 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 07:15:03,655 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 07:15:03,655 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_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca2dcd06e0389cf665904adfee9ccd6a1a268c87541d3b3b3e0bcffb3a75664e [2022-12-14 07:15:03,849 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 07:15:03,869 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 07:15:03,871 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 07:15:03,872 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 07:15:03,872 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 07:15:03,873 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-crafted/zero_sum4.c [2022-12-14 07:15:06,500 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 07:15:06,642 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 07:15:06,643 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/sv-benchmarks/c/array-crafted/zero_sum4.c [2022-12-14 07:15:06,647 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/data/63ef7dab7/42750b00a1924b248e6a4d8724c1ba88/FLAG0e2054071 [2022-12-14 07:15:06,659 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/data/63ef7dab7/42750b00a1924b248e6a4d8724c1ba88 [2022-12-14 07:15:06,662 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 07:15:06,663 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 07:15:06,664 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 07:15:06,665 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 07:15:06,668 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 07:15:06,668 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,669 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e3186d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06, skipping insertion in model container [2022-12-14 07:15:06,669 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,676 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 07:15:06,691 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 07:15:06,813 WARN L237 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_a250b4d2-1f12-425b-bbb2-23372bacc622/sv-benchmarks/c/array-crafted/zero_sum4.c[400,413] [2022-12-14 07:15:06,834 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 07:15:06,843 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 07:15:06,854 WARN L237 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_a250b4d2-1f12-425b-bbb2-23372bacc622/sv-benchmarks/c/array-crafted/zero_sum4.c[400,413] [2022-12-14 07:15:06,864 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 07:15:06,874 INFO L208 MainTranslator]: Completed translation [2022-12-14 07:15:06,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06 WrapperNode [2022-12-14 07:15:06,875 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 07:15:06,876 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 07:15:06,876 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 07:15:06,876 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 07:15:06,881 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,887 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,907 INFO L138 Inliner]: procedures = 15, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 127 [2022-12-14 07:15:06,907 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 07:15:06,908 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 07:15:06,908 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 07:15:06,908 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 07:15:06,917 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,918 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,920 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,920 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,925 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,929 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,930 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,931 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,933 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 07:15:06,934 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 07:15:06,934 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 07:15:06,935 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 07:15:06,935 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (1/1) ... [2022-12-14 07:15:06,942 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 07:15:06,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:06,958 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 07:15:06,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 07:15:06,984 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 07:15:06,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 07:15:06,984 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 07:15:06,985 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 07:15:06,985 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 07:15:06,985 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 07:15:06,985 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 07:15:06,985 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 07:15:07,043 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 07:15:07,045 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 07:15:07,204 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 07:15:07,268 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 07:15:07,268 INFO L300 CfgBuilder]: Removed 9 assume(true) statements. [2022-12-14 07:15:07,270 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 07:15:07 BoogieIcfgContainer [2022-12-14 07:15:07,270 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 07:15:07,273 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 07:15:07,273 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 07:15:07,276 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 07:15:07,276 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 07:15:06" (1/3) ... [2022-12-14 07:15:07,277 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@933658e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 07:15:07, skipping insertion in model container [2022-12-14 07:15:07,277 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 07:15:06" (2/3) ... [2022-12-14 07:15:07,278 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@933658e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 07:15:07, skipping insertion in model container [2022-12-14 07:15:07,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 07:15:07" (3/3) ... [2022-12-14 07:15:07,279 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum4.c [2022-12-14 07:15:07,294 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 07:15:07,294 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 07:15:07,328 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 07:15:07,334 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;@2e0621dd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 07:15:07,334 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 07:15:07,337 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 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) [2022-12-14 07:15:07,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 07:15:07,341 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:07,341 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:07,342 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:07,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:07,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1746940592, now seen corresponding path program 1 times [2022-12-14 07:15:07,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:07,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671182723] [2022-12-14 07:15:07,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:07,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:07,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:07,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:07,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:07,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671182723] [2022-12-14 07:15:07,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [671182723] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:15:07,567 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:15:07,567 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 07:15:07,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527371079] [2022-12-14 07:15:07,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:15:07,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 07:15:07,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:07,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 07:15:07,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 07:15:07,596 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 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) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) [2022-12-14 07:15:07,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:07,654 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2022-12-14 07:15:07,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 07:15:07,656 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) Word has length 13 [2022-12-14 07:15:07,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:07,661 INFO L225 Difference]: With dead ends: 32 [2022-12-14 07:15:07,661 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 07:15:07,663 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 07:15:07,665 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:07,667 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:15:07,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 07:15:07,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-12-14 07:15:07,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 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) [2022-12-14 07:15:07,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2022-12-14 07:15:07,693 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2022-12-14 07:15:07,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:07,693 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2022-12-14 07:15:07,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) [2022-12-14 07:15:07,694 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2022-12-14 07:15:07,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 07:15:07,694 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:07,694 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:07,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 07:15:07,695 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:07,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:07,696 INFO L85 PathProgramCache]: Analyzing trace with hash 2079009635, now seen corresponding path program 1 times [2022-12-14 07:15:07,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:07,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435669053] [2022-12-14 07:15:07,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:07,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:07,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:07,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 07:15:07,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:07,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435669053] [2022-12-14 07:15:07,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435669053] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 07:15:07,762 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 07:15:07,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 07:15:07,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929863375] [2022-12-14 07:15:07,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 07:15:07,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 07:15:07,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:07,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 07:15:07,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 07:15:07,764 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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) [2022-12-14 07:15:07,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:07,820 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2022-12-14 07:15:07,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 07:15:07,821 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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) Word has length 14 [2022-12-14 07:15:07,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:07,821 INFO L225 Difference]: With dead ends: 33 [2022-12-14 07:15:07,821 INFO L226 Difference]: Without dead ends: 23 [2022-12-14 07:15:07,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 07:15:07,822 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:07,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 5 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:15:07,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-12-14 07:15:07,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-12-14 07:15:07,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 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) [2022-12-14 07:15:07,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-12-14 07:15:07,828 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2022-12-14 07:15:07,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:07,828 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-12-14 07:15:07,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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) [2022-12-14 07:15:07,829 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-12-14 07:15:07,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 07:15:07,829 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:07,829 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:07,829 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 07:15:07,830 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:07,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:07,830 INFO L85 PathProgramCache]: Analyzing trace with hash -1341023684, now seen corresponding path program 1 times [2022-12-14 07:15:07,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:07,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187635826] [2022-12-14 07:15:07,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:07,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:07,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:07,949 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 07:15:07,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:07,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187635826] [2022-12-14 07:15:07,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187635826] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:07,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828839784] [2022-12-14 07:15:07,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:07,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:07,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:07,951 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:07,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 07:15:08,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:08,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 07:15:08,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:08,060 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 07:15:08,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:08,080 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 07:15:08,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828839784] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:08,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2131038732] [2022-12-14 07:15:08,101 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:08,101 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:08,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:08,110 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:08,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:08,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:08,207 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:15:08,208 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:15:08,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:08,254 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:08,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:08,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:08,287 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:15:08,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:08,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:08,376 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:15:08,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:15:08,436 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 16 treesize of output 12 [2022-12-14 07:15:08,664 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:08,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '336#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:08,855 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:08,855 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:08,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-12-14 07:15:08,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889266244] [2022-12-14 07:15:08,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:08,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 07:15:08,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:08,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 07:15:08,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-12-14 07:15:08,857 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 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) [2022-12-14 07:15:08,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:08,908 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2022-12-14 07:15:08,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 07:15:08,909 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 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) Word has length 22 [2022-12-14 07:15:08,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:08,910 INFO L225 Difference]: With dead ends: 43 [2022-12-14 07:15:08,910 INFO L226 Difference]: Without dead ends: 24 [2022-12-14 07:15:08,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-12-14 07:15:08,912 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:08,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:15:08,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-12-14 07:15:08,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-12-14 07:15:08,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 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) [2022-12-14 07:15:08,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-12-14 07:15:08,918 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2022-12-14 07:15:08,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:08,918 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-12-14 07:15:08,919 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 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) [2022-12-14 07:15:08,919 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-12-14 07:15:08,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 07:15:08,920 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:08,920 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:08,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 07:15:09,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:09,121 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:09,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:09,122 INFO L85 PathProgramCache]: Analyzing trace with hash 1097032073, now seen corresponding path program 2 times [2022-12-14 07:15:09,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:09,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743793544] [2022-12-14 07:15:09,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:09,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:09,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:09,243 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 07:15:09,243 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:09,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743793544] [2022-12-14 07:15:09,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743793544] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:09,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610616989] [2022-12-14 07:15:09,244 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:15:09,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:09,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:09,245 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:09,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 07:15:09,296 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 07:15:09,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:15:09,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 07:15:09,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:09,335 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 07:15:09,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:09,368 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 07:15:09,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610616989] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:09,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1386064286] [2022-12-14 07:15:09,371 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:09,371 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:09,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:09,372 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:09,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:09,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:09,414 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:15:09,414 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:15:09,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:09,450 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:09,450 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:09,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:09,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:15:09,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:09,531 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:09,551 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:15:09,552 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:15:09,637 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 16 treesize of output 12 [2022-12-14 07:15:09,842 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:10,022 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '602#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:10,022 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:10,022 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:10,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-12-14 07:15:10,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462684790] [2022-12-14 07:15:10,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:10,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 07:15:10,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:10,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 07:15:10,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-12-14 07:15:10,024 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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) [2022-12-14 07:15:10,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:10,081 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2022-12-14 07:15:10,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 07:15:10,082 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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 [2022-12-14 07:15:10,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:10,082 INFO L225 Difference]: With dead ends: 49 [2022-12-14 07:15:10,082 INFO L226 Difference]: Without dead ends: 32 [2022-12-14 07:15:10,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 54 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-12-14 07:15:10,084 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:10,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 5 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 07:15:10,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-12-14 07:15:10,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-12-14 07:15:10,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 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) [2022-12-14 07:15:10,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-12-14 07:15:10,089 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2022-12-14 07:15:10,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:10,089 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-12-14 07:15:10,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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) [2022-12-14 07:15:10,089 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-12-14 07:15:10,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 07:15:10,090 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:10,090 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:10,095 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 07:15:10,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:10,292 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:10,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:10,293 INFO L85 PathProgramCache]: Analyzing trace with hash -1956003888, now seen corresponding path program 3 times [2022-12-14 07:15:10,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:10,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182935132] [2022-12-14 07:15:10,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:10,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:10,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:12,636 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:12,637 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:12,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182935132] [2022-12-14 07:15:12,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182935132] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:12,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675978078] [2022-12-14 07:15:12,637 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:15:12,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:12,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:12,639 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:12,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 07:15:12,695 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:15:12,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:15:12,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 07:15:12,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:12,721 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 11 [2022-12-14 07:15:13,119 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:13,120 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:15:13,121 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 9 [2022-12-14 07:15:13,149 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:13,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:13,377 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 07:15:13,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675978078] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:13,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1789435211] [2022-12-14 07:15:13,380 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:13,380 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:13,380 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:13,381 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:13,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:13,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:13,420 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:15:13,420 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:15:13,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:13,453 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:13,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:13,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:13,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:15:13,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:13,568 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:13,587 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:15:13,588 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:15:13,689 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 16 treesize of output 12 [2022-12-14 07:15:13,857 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:14,197 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '954#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:14,197 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:14,197 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:14,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 9] total 18 [2022-12-14 07:15:14,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098447934] [2022-12-14 07:15:14,198 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:14,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 07:15:14,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:14,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 07:15:14,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2022-12-14 07:15:14,200 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 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) [2022-12-14 07:15:14,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:14,444 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2022-12-14 07:15:14,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 07:15:14,444 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 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 31 [2022-12-14 07:15:14,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:14,445 INFO L225 Difference]: With dead ends: 57 [2022-12-14 07:15:14,445 INFO L226 Difference]: Without dead ends: 54 [2022-12-14 07:15:14,445 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 60 SyntacticMatches, 40 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2022-12-14 07:15:14,446 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:14,446 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 21 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:15:14,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-12-14 07:15:14,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2022-12-14 07:15:14,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 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) [2022-12-14 07:15:14,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-12-14 07:15:14,455 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2022-12-14 07:15:14,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:14,455 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-12-14 07:15:14,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 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) [2022-12-14 07:15:14,455 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-12-14 07:15:14,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 07:15:14,456 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:14,456 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:14,461 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 07:15:14,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:14,657 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:14,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:14,659 INFO L85 PathProgramCache]: Analyzing trace with hash 1292936998, now seen corresponding path program 4 times [2022-12-14 07:15:14,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:14,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777057610] [2022-12-14 07:15:14,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:14,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:14,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:14,763 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 07:15:14,763 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:14,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777057610] [2022-12-14 07:15:14,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777057610] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:14,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386355526] [2022-12-14 07:15:14,763 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:15:14,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:14,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:14,765 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:14,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 07:15:14,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:14,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 07:15:14,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:14,867 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 07:15:14,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:14,906 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 07:15:14,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386355526] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:14,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1828532005] [2022-12-14 07:15:14,908 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:14,908 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:14,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:14,909 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:14,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:14,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:14,942 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:14,942 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:14,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:14,952 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:15:14,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:14,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:15:15,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:15,013 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:15,032 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:15:15,032 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:15:15,098 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 16 treesize of output 12 [2022-12-14 07:15:15,253 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:15,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1366#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:15,410 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:15,410 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:15,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-12-14 07:15:15,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468915228] [2022-12-14 07:15:15,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:15,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 07:15:15,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:15,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 07:15:15,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2022-12-14 07:15:15,413 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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) [2022-12-14 07:15:15,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:15,558 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2022-12-14 07:15:15,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 07:15:15,558 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 32 [2022-12-14 07:15:15,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:15,558 INFO L225 Difference]: With dead ends: 102 [2022-12-14 07:15:15,558 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 07:15:15,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2022-12-14 07:15:15,559 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 43 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:15,560 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 9 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:15:15,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 07:15:15,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-12-14 07:15:15,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 52 states have internal predecessors, (68), 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) [2022-12-14 07:15:15,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2022-12-14 07:15:15,568 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 32 [2022-12-14 07:15:15,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:15,568 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2022-12-14 07:15:15,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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) [2022-12-14 07:15:15,568 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2022-12-14 07:15:15,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 07:15:15,569 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:15,569 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:15,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-12-14 07:15:15,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:15,771 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:15,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:15,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1126206925, now seen corresponding path program 5 times [2022-12-14 07:15:15,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:15,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079314609] [2022-12-14 07:15:15,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:15,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:15,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:15,891 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-12-14 07:15:15,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:15,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079314609] [2022-12-14 07:15:15,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079314609] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:15,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67609849] [2022-12-14 07:15:15,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:15:15,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:15,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:15,893 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:15,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 07:15:15,962 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 07:15:15,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:15:15,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 07:15:15,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:16,007 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-12-14 07:15:16,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:16,040 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-12-14 07:15:16,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67609849] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:16,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1163053531] [2022-12-14 07:15:16,042 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:16,042 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:16,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:16,042 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:16,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:16,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:16,076 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:15:16,076 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:15:16,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:16,103 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:16,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:16,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:16,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:15:16,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:16,167 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:16,184 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:15:16,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:15:16,250 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 16 treesize of output 12 [2022-12-14 07:15:16,384 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:16,638 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1880#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:16,639 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:16,639 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:16,639 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-12-14 07:15:16,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720758972] [2022-12-14 07:15:16,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:16,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 07:15:16,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:16,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 07:15:16,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2022-12-14 07:15:16,640 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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) [2022-12-14 07:15:16,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:16,761 INFO L93 Difference]: Finished difference Result 82 states and 110 transitions. [2022-12-14 07:15:16,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 07:15:16,761 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 33 [2022-12-14 07:15:16,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:16,761 INFO L225 Difference]: With dead ends: 82 [2022-12-14 07:15:16,762 INFO L226 Difference]: Without dead ends: 41 [2022-12-14 07:15:16,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 76 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2022-12-14 07:15:16,763 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 105 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:16,763 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 11 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:15:16,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-12-14 07:15:16,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-12-14 07:15:16,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 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) [2022-12-14 07:15:16,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-12-14 07:15:16,769 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2022-12-14 07:15:16,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:16,769 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-12-14 07:15:16,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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) [2022-12-14 07:15:16,769 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-12-14 07:15:16,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 07:15:16,770 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:16,770 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:16,775 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 07:15:16,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 07:15:16,971 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:16,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:16,972 INFO L85 PathProgramCache]: Analyzing trace with hash -1772936516, now seen corresponding path program 6 times [2022-12-14 07:15:16,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:16,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814602438] [2022-12-14 07:15:16,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:16,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:17,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:19,694 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:19,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:19,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814602438] [2022-12-14 07:15:19,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814602438] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:19,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669801411] [2022-12-14 07:15:19,695 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:15:19,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:19,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:19,696 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:19,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 07:15:19,767 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:15:19,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:15:19,770 WARN L261 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 114 conjunts are in the unsatisfiable core [2022-12-14 07:15:19,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:19,796 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 11 [2022-12-14 07:15:20,491 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:20,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:20,849 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 07:15:20,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669801411] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:20,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1429151009] [2022-12-14 07:15:20,850 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:20,850 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:20,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:20,850 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:20,851 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:20,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:20,878 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:15:20,878 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:15:20,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:20,902 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:20,902 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:20,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:20,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:15:20,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:20,958 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:20,976 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:15:20,977 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:15:21,034 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 16 treesize of output 12 [2022-12-14 07:15:21,192 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:21,954 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2404#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:21,955 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:21,955 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:21,955 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 15, 11] total 44 [2022-12-14 07:15:21,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706262183] [2022-12-14 07:15:21,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:21,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 07:15:21,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:21,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 07:15:21,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2169, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 07:15:21,957 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 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) [2022-12-14 07:15:24,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:24,029 INFO L93 Difference]: Finished difference Result 112 states and 139 transitions. [2022-12-14 07:15:24,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 07:15:24,030 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 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 40 [2022-12-14 07:15:24,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:24,032 INFO L225 Difference]: With dead ends: 112 [2022-12-14 07:15:24,032 INFO L226 Difference]: Without dead ends: 109 [2022-12-14 07:15:24,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 73 SyntacticMatches, 37 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2227 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=464, Invalid=4648, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 07:15:24,034 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 23 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 1250 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 1408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:24,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 96 Invalid, 1408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 1250 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 07:15:24,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-12-14 07:15:24,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 90. [2022-12-14 07:15:24,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2696629213483146) internal successors, (113), 89 states have internal predecessors, (113), 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) [2022-12-14 07:15:24,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 113 transitions. [2022-12-14 07:15:24,057 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 113 transitions. Word has length 40 [2022-12-14 07:15:24,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:24,057 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 113 transitions. [2022-12-14 07:15:24,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 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) [2022-12-14 07:15:24,058 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 113 transitions. [2022-12-14 07:15:24,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 07:15:24,059 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:24,059 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:24,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-12-14 07:15:24,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:24,260 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:24,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:24,260 INFO L85 PathProgramCache]: Analyzing trace with hash -281860324, now seen corresponding path program 7 times [2022-12-14 07:15:24,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:24,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460621590] [2022-12-14 07:15:24,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:24,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:24,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:24,340 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 07:15:24,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:24,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460621590] [2022-12-14 07:15:24,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [460621590] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:24,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372538020] [2022-12-14 07:15:24,340 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:15:24,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:24,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:24,341 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:24,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 07:15:24,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:24,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 07:15:24,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:24,458 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 07:15:24,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:24,501 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 07:15:24,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372538020] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:24,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074429142] [2022-12-14 07:15:24,503 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:24,503 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:24,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:24,503 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:24,503 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:24,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:24,534 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:24,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:24,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:24,544 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:15:24,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:24,561 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:15:24,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:24,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:24,607 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:15:24,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:15:24,636 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 16 treesize of output 12 [2022-12-14 07:15:24,776 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:25,219 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3100#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:25,219 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:25,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:25,220 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-12-14 07:15:25,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702019224] [2022-12-14 07:15:25,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:25,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 07:15:25,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:25,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 07:15:25,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2022-12-14 07:15:25,221 INFO L87 Difference]: Start difference. First operand 90 states and 113 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) [2022-12-14 07:15:25,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:25,357 INFO L93 Difference]: Finished difference Result 190 states and 238 transitions. [2022-12-14 07:15:25,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 07:15:25,358 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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 41 [2022-12-14 07:15:25,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:25,358 INFO L225 Difference]: With dead ends: 190 [2022-12-14 07:15:25,358 INFO L226 Difference]: Without dead ends: 86 [2022-12-14 07:15:25,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 84 SyntacticMatches, 28 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=131, Invalid=519, Unknown=0, NotChecked=0, Total=650 [2022-12-14 07:15:25,359 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 41 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:25,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 11 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:15:25,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-12-14 07:15:25,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-12-14 07:15:25,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.2588235294117647) internal successors, (107), 85 states have internal predecessors, (107), 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) [2022-12-14 07:15:25,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 107 transitions. [2022-12-14 07:15:25,370 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 107 transitions. Word has length 41 [2022-12-14 07:15:25,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:25,371 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 107 transitions. [2022-12-14 07:15:25,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) [2022-12-14 07:15:25,371 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 107 transitions. [2022-12-14 07:15:25,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 07:15:25,371 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:25,371 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:25,376 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 07:15:25,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:25,573 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:25,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:25,574 INFO L85 PathProgramCache]: Analyzing trace with hash 194214575, now seen corresponding path program 8 times [2022-12-14 07:15:25,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:25,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132694412] [2022-12-14 07:15:25,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:25,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:25,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:25,692 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-12-14 07:15:25,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:25,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132694412] [2022-12-14 07:15:25,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132694412] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:25,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345440372] [2022-12-14 07:15:25,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:15:25,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:25,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:25,694 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:25,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 07:15:25,761 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 07:15:25,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:15:25,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 07:15:25,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:25,840 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-12-14 07:15:25,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:25,903 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-12-14 07:15:25,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345440372] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:25,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1289547677] [2022-12-14 07:15:25,904 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:25,904 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:25,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:25,904 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:25,905 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:25,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:25,929 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:15:25,929 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:15:25,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:25,957 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:25,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:25,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:25,978 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:15:26,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:26,024 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:26,042 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:15:26,043 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:15:26,101 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 16 treesize of output 12 [2022-12-14 07:15:26,260 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:26,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3918#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:26,631 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:26,631 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:26,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2022-12-14 07:15:26,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818381005] [2022-12-14 07:15:26,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:26,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 07:15:26,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:26,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 07:15:26,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-12-14 07:15:26,632 INFO L87 Difference]: Start difference. First operand 86 states and 107 transitions. Second operand has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 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) [2022-12-14 07:15:26,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:26,823 INFO L93 Difference]: Finished difference Result 121 states and 155 transitions. [2022-12-14 07:15:26,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 07:15:26,823 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 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 42 [2022-12-14 07:15:26,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:26,824 INFO L225 Difference]: With dead ends: 121 [2022-12-14 07:15:26,824 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 07:15:26,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 93 SyntacticMatches, 24 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=180, Invalid=750, Unknown=0, NotChecked=0, Total=930 [2022-12-14 07:15:26,825 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 68 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:26,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 15 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:15:26,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 07:15:26,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-12-14 07:15:26,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 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) [2022-12-14 07:15:26,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2022-12-14 07:15:26,830 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 42 [2022-12-14 07:15:26,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:26,830 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2022-12-14 07:15:26,830 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 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) [2022-12-14 07:15:26,830 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2022-12-14 07:15:26,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-12-14 07:15:26,831 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:26,831 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:26,835 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 07:15:27,031 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:27,032 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:27,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:27,033 INFO L85 PathProgramCache]: Analyzing trace with hash 433001040, now seen corresponding path program 9 times [2022-12-14 07:15:27,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:27,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935903440] [2022-12-14 07:15:27,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:27,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:27,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:30,752 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 2 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:30,752 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:30,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935903440] [2022-12-14 07:15:30,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935903440] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:30,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107990197] [2022-12-14 07:15:30,753 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:15:30,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:30,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:30,754 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:30,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 07:15:30,834 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:15:30,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:15:30,838 WARN L261 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 150 conjunts are in the unsatisfiable core [2022-12-14 07:15:30,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:30,907 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 11 [2022-12-14 07:15:31,915 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:31,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:32,669 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 07:15:32,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107990197] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:32,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [372730502] [2022-12-14 07:15:32,670 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:32,670 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:32,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:32,671 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:32,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:32,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:32,692 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:15:32,692 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:15:32,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:32,714 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:32,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:32,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:32,728 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:15:32,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:32,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:32,778 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:15:32,778 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:15:32,814 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 16 treesize of output 12 [2022-12-14 07:15:32,943 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:34,192 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4613#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:34,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:34,192 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:34,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 18, 13] total 56 [2022-12-14 07:15:34,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663736290] [2022-12-14 07:15:34,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:34,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-12-14 07:15:34,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:34,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-12-14 07:15:34,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=3451, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 07:15:34,195 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 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) [2022-12-14 07:15:38,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:38,528 INFO L93 Difference]: Finished difference Result 112 states and 140 transitions. [2022-12-14 07:15:38,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 07:15:38,529 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 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 49 [2022-12-14 07:15:38,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:38,529 INFO L225 Difference]: With dead ends: 112 [2022-12-14 07:15:38,529 INFO L226 Difference]: Without dead ends: 109 [2022-12-14 07:15:38,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 94 SyntacticMatches, 40 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2794 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=525, Invalid=6785, Unknown=0, NotChecked=0, Total=7310 [2022-12-14 07:15:38,531 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 62 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 2386 mSolverCounterSat, 518 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 2904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 518 IncrementalHoareTripleChecker+Valid, 2386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:38,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 61 Invalid, 2904 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [518 Valid, 2386 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 07:15:38,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-12-14 07:15:38,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 51. [2022-12-14 07:15:38,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.18) internal successors, (59), 50 states have internal predecessors, (59), 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) [2022-12-14 07:15:38,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2022-12-14 07:15:38,547 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 49 [2022-12-14 07:15:38,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:38,547 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2022-12-14 07:15:38,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 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) [2022-12-14 07:15:38,547 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2022-12-14 07:15:38,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 07:15:38,547 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:38,547 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:38,552 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 07:15:38,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 07:15:38,749 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:38,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:38,750 INFO L85 PathProgramCache]: Analyzing trace with hash 537427935, now seen corresponding path program 10 times [2022-12-14 07:15:38,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:38,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438624874] [2022-12-14 07:15:38,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:38,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:38,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:38,882 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 07:15:38,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:38,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438624874] [2022-12-14 07:15:38,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438624874] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:38,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051339756] [2022-12-14 07:15:38,883 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:15:38,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:38,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:38,884 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:38,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 07:15:38,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:38,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 07:15:38,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:39,022 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 07:15:39,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:39,085 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 07:15:39,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051339756] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:39,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1742474567] [2022-12-14 07:15:39,087 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:39,087 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:39,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:39,087 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:39,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:39,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:39,114 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:15:39,114 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:15:39,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:39,144 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:39,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:39,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:39,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:15:39,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:39,194 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:39,214 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:15:39,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:15:39,272 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 16 treesize of output 12 [2022-12-14 07:15:39,394 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:39,647 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5292#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:39,647 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:39,647 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:39,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 07:15:39,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865360831] [2022-12-14 07:15:39,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:39,648 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 07:15:39,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:39,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 07:15:39,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2022-12-14 07:15:39,649 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 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) [2022-12-14 07:15:39,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:39,874 INFO L93 Difference]: Finished difference Result 132 states and 155 transitions. [2022-12-14 07:15:39,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 07:15:39,875 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 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 50 [2022-12-14 07:15:39,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:39,875 INFO L225 Difference]: With dead ends: 132 [2022-12-14 07:15:39,876 INFO L226 Difference]: Without dead ends: 52 [2022-12-14 07:15:39,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 123 SyntacticMatches, 15 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2022-12-14 07:15:39,877 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:39,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 9 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:15:39,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-12-14 07:15:39,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-12-14 07:15:39,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.1764705882352942) internal successors, (60), 51 states have internal predecessors, (60), 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) [2022-12-14 07:15:39,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2022-12-14 07:15:39,893 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 50 [2022-12-14 07:15:39,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:39,893 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2022-12-14 07:15:39,893 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 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) [2022-12-14 07:15:39,893 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2022-12-14 07:15:39,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-12-14 07:15:39,894 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:39,894 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:39,898 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 07:15:40,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 07:15:40,095 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:40,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:40,096 INFO L85 PathProgramCache]: Analyzing trace with hash 92373420, now seen corresponding path program 11 times [2022-12-14 07:15:40,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:40,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482473360] [2022-12-14 07:15:40,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:40,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:40,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:40,239 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-12-14 07:15:40,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:40,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482473360] [2022-12-14 07:15:40,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482473360] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:40,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137245998] [2022-12-14 07:15:40,240 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:15:40,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:40,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:40,241 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:40,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 07:15:40,306 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 07:15:40,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:15:40,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 07:15:40,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:40,386 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-12-14 07:15:40,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:40,455 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-12-14 07:15:40,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137245998] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:40,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1875981694] [2022-12-14 07:15:40,457 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:40,457 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:40,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:40,457 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:40,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:40,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:40,487 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:40,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:40,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:40,493 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:15:40,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:40,506 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:15:40,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:40,535 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:15:40,548 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:15:40,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:15:40,604 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 16 treesize of output 12 [2022-12-14 07:15:40,720 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:41,161 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5982#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:41,161 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:41,162 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:41,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 07:15:41,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441897665] [2022-12-14 07:15:41,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:41,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 07:15:41,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:41,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 07:15:41,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2022-12-14 07:15:41,163 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 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) [2022-12-14 07:15:41,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:15:41,354 INFO L93 Difference]: Finished difference Result 98 states and 119 transitions. [2022-12-14 07:15:41,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 07:15:41,355 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 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 51 [2022-12-14 07:15:41,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:15:41,355 INFO L225 Difference]: With dead ends: 98 [2022-12-14 07:15:41,355 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 07:15:41,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 105 SyntacticMatches, 36 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2022-12-14 07:15:41,357 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 196 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:15:41,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 11 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:15:41,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 07:15:41,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-12-14 07:15:41,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 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) [2022-12-14 07:15:41,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2022-12-14 07:15:41,381 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 51 [2022-12-14 07:15:41,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:15:41,381 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2022-12-14 07:15:41,381 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 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) [2022-12-14 07:15:41,381 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2022-12-14 07:15:41,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-12-14 07:15:41,382 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:15:41,382 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:15:41,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-12-14 07:15:41,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:41,583 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:15:41,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:15:41,584 INFO L85 PathProgramCache]: Analyzing trace with hash -1752380612, now seen corresponding path program 12 times [2022-12-14 07:15:41,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:15:41,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301137040] [2022-12-14 07:15:41,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:15:41,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:15:41,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:15:47,330 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 4 proven. 131 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:47,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:15:47,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301137040] [2022-12-14 07:15:47,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301137040] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:15:47,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294317816] [2022-12-14 07:15:47,330 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:15:47,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:15:47,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:15:47,331 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:15:47,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 07:15:47,416 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:15:47,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:15:47,421 WARN L261 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 182 conjunts are in the unsatisfiable core [2022-12-14 07:15:47,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:15:47,507 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 11 [2022-12-14 07:15:49,463 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:15:49,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:15:50,603 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 07:15:50,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294317816] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:15:50,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1166439381] [2022-12-14 07:15:50,605 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:15:50,605 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:15:50,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:15:50,605 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:15:50,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:15:50,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:50,633 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:15:50,633 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:15:50,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:50,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:15:50,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:50,660 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:15:50,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:50,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:15:50,724 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:15:50,725 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:15:50,768 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 16 treesize of output 12 [2022-12-14 07:15:50,910 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:15:53,200 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6711#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:15:53,200 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:15:53,200 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:15:53,200 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 21, 15] total 69 [2022-12-14 07:15:53,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267977804] [2022-12-14 07:15:53,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:15:53,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-12-14 07:15:53,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:15:53,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-12-14 07:15:53,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=5132, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 07:15:53,204 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 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) [2022-12-14 07:16:00,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:16:00,015 INFO L93 Difference]: Finished difference Result 225 states and 266 transitions. [2022-12-14 07:16:00,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-12-14 07:16:00,015 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 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 58 [2022-12-14 07:16:00,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:16:00,016 INFO L225 Difference]: With dead ends: 225 [2022-12-14 07:16:00,016 INFO L226 Difference]: Without dead ends: 156 [2022-12-14 07:16:00,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 102 SyntacticMatches, 55 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5394 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=1031, Invalid=12541, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 07:16:00,019 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 53 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 3004 mSolverCounterSat, 812 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 3816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 812 IncrementalHoareTripleChecker+Valid, 3004 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:16:00,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 133 Invalid, 3816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [812 Valid, 3004 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-12-14 07:16:00,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-12-14 07:16:00,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 124. [2022-12-14 07:16:00,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.1788617886178863) internal successors, (145), 123 states have internal predecessors, (145), 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) [2022-12-14 07:16:00,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 145 transitions. [2022-12-14 07:16:00,069 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 145 transitions. Word has length 58 [2022-12-14 07:16:00,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:16:00,070 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 145 transitions. [2022-12-14 07:16:00,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 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) [2022-12-14 07:16:00,070 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 145 transitions. [2022-12-14 07:16:00,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 07:16:00,070 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:16:00,070 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:16:00,075 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 07:16:00,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 07:16:00,271 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:16:00,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:16:00,273 INFO L85 PathProgramCache]: Analyzing trace with hash 1702527151, now seen corresponding path program 13 times [2022-12-14 07:16:00,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:16:00,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477051655] [2022-12-14 07:16:00,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:16:00,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:16:00,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:16:00,450 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-12-14 07:16:00,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:16:00,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477051655] [2022-12-14 07:16:00,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477051655] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:16:00,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765048463] [2022-12-14 07:16:00,450 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:16:00,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:16:00,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:16:00,451 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:16:00,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 07:16:00,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:16:00,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 07:16:00,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:16:00,612 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-12-14 07:16:00,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:16:00,667 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-12-14 07:16:00,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [765048463] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:16:00,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1506201013] [2022-12-14 07:16:00,669 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:16:00,669 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:16:00,669 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:16:00,669 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:16:00,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:16:00,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:00,697 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:16:00,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:16:00,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:00,703 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:16:00,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:00,716 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:16:00,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:00,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:00,780 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:16:00,780 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:16:00,809 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 16 treesize of output 12 [2022-12-14 07:16:00,952 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:16:01,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7858#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:16:01,468 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:16:01,468 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:16:01,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-12-14 07:16:01,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714081882] [2022-12-14 07:16:01,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:16:01,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 07:16:01,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:16:01,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 07:16:01,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-12-14 07:16:01,469 INFO L87 Difference]: Start difference. First operand 124 states and 145 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 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) [2022-12-14 07:16:01,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:16:01,709 INFO L93 Difference]: Finished difference Result 171 states and 205 transitions. [2022-12-14 07:16:01,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 07:16:01,710 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 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) Word has length 60 [2022-12-14 07:16:01,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:16:01,710 INFO L225 Difference]: With dead ends: 171 [2022-12-14 07:16:01,710 INFO L226 Difference]: Without dead ends: 68 [2022-12-14 07:16:01,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 131 SyntacticMatches, 36 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 07:16:01,711 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 354 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 07:16:01,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [354 Valid, 13 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 07:16:01,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-12-14 07:16:01,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-12-14 07:16:01,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 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) [2022-12-14 07:16:01,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2022-12-14 07:16:01,735 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 60 [2022-12-14 07:16:01,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:16:01,735 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2022-12-14 07:16:01,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 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) [2022-12-14 07:16:01,735 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2022-12-14 07:16:01,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 07:16:01,736 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:16:01,736 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:16:01,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 07:16:01,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 07:16:01,937 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:16:01,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:16:01,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1126155472, now seen corresponding path program 14 times [2022-12-14 07:16:01,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:16:01,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712644261] [2022-12-14 07:16:01,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:16:01,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:16:02,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:16:10,534 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 9 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:16:10,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:16:10,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712644261] [2022-12-14 07:16:10,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712644261] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:16:10,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954270430] [2022-12-14 07:16:10,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:16:10,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:16:10,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:16:10,536 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:16:10,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 07:16:10,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 07:16:10,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:16:10,631 WARN L261 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 218 conjunts are in the unsatisfiable core [2022-12-14 07:16:10,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:16:19,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:19,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:19,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:19,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:19,626 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:16:19,653 INFO L321 Elim1Store]: treesize reduction 20, result has 77.8 percent of original size [2022-12-14 07:16:19,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 97 treesize of output 90 [2022-12-14 07:16:19,840 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 6 proven. 168 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 07:16:19,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:16:28,622 INFO L321 Elim1Store]: treesize reduction 206, result has 57.3 percent of original size [2022-12-14 07:16:28,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 102 treesize of output 293 [2022-12-14 07:16:29,581 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 07:16:29,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954270430] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:16:29,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1624032778] [2022-12-14 07:16:29,582 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:16:29,582 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:16:29,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:16:29,582 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:16:29,582 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:16:29,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:29,604 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:16:29,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:16:29,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:29,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:16:29,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:29,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:16:29,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:29,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:16:29,672 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:16:29,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:16:29,698 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 16 treesize of output 12 [2022-12-14 07:16:29,835 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:16:33,930 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8863#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:16:33,930 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:16:33,930 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:16:33,930 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 37, 40] total 125 [2022-12-14 07:16:33,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489133841] [2022-12-14 07:16:33,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:16:33,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-12-14 07:16:33,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:16:33,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-12-14 07:16:33,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1014, Invalid=15755, Unknown=1, NotChecked=0, Total=16770 [2022-12-14 07:16:33,934 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 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) [2022-12-14 07:17:04,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:17:04,600 INFO L93 Difference]: Finished difference Result 294 states and 346 transitions. [2022-12-14 07:17:04,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-12-14 07:17:04,600 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 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 67 [2022-12-14 07:17:04,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:17:04,601 INFO L225 Difference]: With dead ends: 294 [2022-12-14 07:17:04,601 INFO L226 Difference]: Without dead ends: 178 [2022-12-14 07:17:04,604 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 88 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14368 ImplicationChecksByTransitivity, 45.9s TimeCoverageRelationStatistics Valid=3334, Invalid=35671, Unknown=1, NotChecked=0, Total=39006 [2022-12-14 07:17:04,604 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 287 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 7102 mSolverCounterSat, 1939 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 9041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1939 IncrementalHoareTripleChecker+Valid, 7102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2022-12-14 07:17:04,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 194 Invalid, 9041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1939 Valid, 7102 Invalid, 0 Unknown, 0 Unchecked, 7.7s Time] [2022-12-14 07:17:04,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-12-14 07:17:04,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 118. [2022-12-14 07:17:04,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.1538461538461537) internal successors, (135), 117 states have internal predecessors, (135), 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) [2022-12-14 07:17:04,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 135 transitions. [2022-12-14 07:17:04,668 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 135 transitions. Word has length 67 [2022-12-14 07:17:04,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:17:04,668 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 135 transitions. [2022-12-14 07:17:04,668 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 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) [2022-12-14 07:17:04,669 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 135 transitions. [2022-12-14 07:17:04,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-12-14 07:17:04,669 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:17:04,669 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:17:04,675 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 07:17:04,870 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:17:04,870 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:17:04,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:17:04,871 INFO L85 PathProgramCache]: Analyzing trace with hash -1528330568, now seen corresponding path program 15 times [2022-12-14 07:17:04,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:17:04,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301468911] [2022-12-14 07:17:04,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:17:04,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:17:04,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:17:05,039 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-12-14 07:17:05,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:17:05,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301468911] [2022-12-14 07:17:05,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301468911] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:17:05,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832878215] [2022-12-14 07:17:05,039 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:17:05,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:17:05,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:17:05,040 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:17:05,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 07:17:05,125 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:17:05,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:17:05,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 07:17:05,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:17:05,258 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-12-14 07:17:05,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:17:05,363 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-12-14 07:17:05,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832878215] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:17:05,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229323802] [2022-12-14 07:17:05,364 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:17:05,364 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:17:05,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:17:05,365 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:17:05,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:17:05,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:05,387 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:17:05,387 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:17:05,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:05,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:17:05,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:05,411 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:17:05,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:05,442 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:17:05,456 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:17:05,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:17:05,512 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 16 treesize of output 12 [2022-12-14 07:17:05,641 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:17:06,220 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10250#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:17:06,220 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:17:06,220 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:17:06,220 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2022-12-14 07:17:06,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789990150] [2022-12-14 07:17:06,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:17:06,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 07:17:06,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:17:06,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 07:17:06,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1121, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 07:17:06,222 INFO L87 Difference]: Start difference. First operand 118 states and 135 transitions. Second operand has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 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) [2022-12-14 07:17:06,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:17:06,569 INFO L93 Difference]: Finished difference Result 170 states and 199 transitions. [2022-12-14 07:17:06,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 07:17:06,569 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 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 69 [2022-12-14 07:17:06,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:17:06,569 INFO L225 Difference]: With dead ends: 170 [2022-12-14 07:17:06,569 INFO L226 Difference]: Without dead ends: 77 [2022-12-14 07:17:06,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 145 SyntacticMatches, 42 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=393, Invalid=1677, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 07:17:06,570 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 170 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 627 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 627 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:17:06,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 19 Invalid, 858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 627 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:17:06,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-12-14 07:17:06,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-12-14 07:17:06,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.118421052631579) internal successors, (85), 76 states have internal predecessors, (85), 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) [2022-12-14 07:17:06,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2022-12-14 07:17:06,607 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 69 [2022-12-14 07:17:06,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:17:06,607 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2022-12-14 07:17:06,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 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) [2022-12-14 07:17:06,607 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2022-12-14 07:17:06,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-12-14 07:17:06,607 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:17:06,607 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:17:06,612 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 07:17:06,808 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 07:17:06,809 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:17:06,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:17:06,810 INFO L85 PathProgramCache]: Analyzing trace with hash 506368956, now seen corresponding path program 16 times [2022-12-14 07:17:06,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:17:06,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608788795] [2022-12-14 07:17:06,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:17:06,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:17:07,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:17:17,476 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 21 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:17:17,477 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:17:17,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608788795] [2022-12-14 07:17:17,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608788795] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:17:17,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191508157] [2022-12-14 07:17:17,477 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:17:17,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:17:17,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:17:17,478 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:17:17,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 07:17:17,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:17:17,593 WARN L261 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 250 conjunts are in the unsatisfiable core [2022-12-14 07:17:17,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:17:17,722 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 13 treesize of output 9 [2022-12-14 07:17:20,609 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:17:20,611 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:17:20,611 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2022-12-14 07:17:20,715 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:17:20,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:17:22,549 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 07:17:22,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191508157] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:17:22,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [866308709] [2022-12-14 07:17:22,550 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:17:22,550 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:17:22,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:17:22,551 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:17:22,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:17:22,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:22,578 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:17:22,578 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:17:22,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:22,607 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:17:22,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:17:22,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:22,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:17:22,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:22,654 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:17:22,673 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:17:22,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:17:22,731 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 16 treesize of output 12 [2022-12-14 07:17:22,864 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:17:24,729 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11283#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:17:24,729 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:17:24,729 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:17:24,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 27, 19] total 79 [2022-12-14 07:17:24,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433304723] [2022-12-14 07:17:24,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:17:24,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-12-14 07:17:24,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:17:24,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-12-14 07:17:24,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=6574, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 07:17:24,731 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 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) [2022-12-14 07:17:32,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:17:32,916 INFO L93 Difference]: Finished difference Result 201 states and 231 transitions. [2022-12-14 07:17:32,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 07:17:32,916 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 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 76 [2022-12-14 07:17:32,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:17:32,917 INFO L225 Difference]: With dead ends: 201 [2022-12-14 07:17:32,917 INFO L226 Difference]: Without dead ends: 198 [2022-12-14 07:17:32,918 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 149 SyntacticMatches, 70 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7225 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=1101, Invalid=13905, Unknown=0, NotChecked=0, Total=15006 [2022-12-14 07:17:32,918 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 42 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 4354 mSolverCounterSat, 560 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 4914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 560 IncrementalHoareTripleChecker+Valid, 4354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-12-14 07:17:32,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 95 Invalid, 4914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [560 Valid, 4354 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-12-14 07:17:32,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2022-12-14 07:17:32,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 138. [2022-12-14 07:17:33,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.145985401459854) internal successors, (157), 137 states have internal predecessors, (157), 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) [2022-12-14 07:17:33,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 157 transitions. [2022-12-14 07:17:33,002 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 157 transitions. Word has length 76 [2022-12-14 07:17:33,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:17:33,002 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 157 transitions. [2022-12-14 07:17:33,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 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) [2022-12-14 07:17:33,002 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 157 transitions. [2022-12-14 07:17:33,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-12-14 07:17:33,002 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:17:33,002 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:17:33,007 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 07:17:33,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 07:17:33,204 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:17:33,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:17:33,205 INFO L85 PathProgramCache]: Analyzing trace with hash -1483133965, now seen corresponding path program 17 times [2022-12-14 07:17:33,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:17:33,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557220679] [2022-12-14 07:17:33,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:17:33,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:17:33,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:17:33,429 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-12-14 07:17:33,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:17:33,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557220679] [2022-12-14 07:17:33,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557220679] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:17:33,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18243706] [2022-12-14 07:17:33,430 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:17:33,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:17:33,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:17:33,431 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:17:33,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 07:17:33,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 07:17:33,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:17:33,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 07:17:33,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:17:33,666 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-12-14 07:17:33,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:17:33,769 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-12-14 07:17:33,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18243706] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:17:33,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [346921454] [2022-12-14 07:17:33,770 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:17:33,770 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:17:33,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:17:33,770 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:17:33,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:17:33,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:33,796 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:17:33,796 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:17:33,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:33,817 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:17:33,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:17:33,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:33,832 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:17:33,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:33,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:33,869 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:17:33,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:17:33,897 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 16 treesize of output 12 [2022-12-14 07:17:34,013 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:17:34,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12513#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:17:34,600 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:17:34,600 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:17:34,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-12-14 07:17:34,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778518661] [2022-12-14 07:17:34,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:17:34,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 07:17:34,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:17:34,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 07:17:34,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 07:17:34,602 INFO L87 Difference]: Start difference. First operand 138 states and 157 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 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) [2022-12-14 07:17:35,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:17:35,084 INFO L93 Difference]: Finished difference Result 324 states and 369 transitions. [2022-12-14 07:17:35,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 07:17:35,084 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 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 77 [2022-12-14 07:17:35,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:17:35,085 INFO L225 Difference]: With dead ends: 324 [2022-12-14 07:17:35,085 INFO L226 Difference]: Without dead ends: 139 [2022-12-14 07:17:35,085 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 176 SyntacticMatches, 40 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 07:17:35,085 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:17:35,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 17 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 658 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:17:35,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-12-14 07:17:35,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2022-12-14 07:17:35,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.144927536231884) internal successors, (158), 138 states have internal predecessors, (158), 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) [2022-12-14 07:17:35,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 158 transitions. [2022-12-14 07:17:35,168 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 158 transitions. Word has length 77 [2022-12-14 07:17:35,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:17:35,168 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 158 transitions. [2022-12-14 07:17:35,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 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) [2022-12-14 07:17:35,168 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 158 transitions. [2022-12-14 07:17:35,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-12-14 07:17:35,168 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:17:35,169 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:17:35,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-12-14 07:17:35,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:17:35,370 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:17:35,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:17:35,371 INFO L85 PathProgramCache]: Analyzing trace with hash -957713914, now seen corresponding path program 18 times [2022-12-14 07:17:35,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:17:35,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273628487] [2022-12-14 07:17:35,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:17:35,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:17:35,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:17:35,587 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-12-14 07:17:35,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:17:35,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273628487] [2022-12-14 07:17:35,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273628487] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:17:35,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342453872] [2022-12-14 07:17:35,587 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:17:35,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:17:35,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:17:35,588 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:17:35,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 07:17:35,666 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:17:35,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:17:35,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 07:17:35,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:17:35,859 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-12-14 07:17:35,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:17:36,038 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-12-14 07:17:36,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342453872] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:17:36,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1608072931] [2022-12-14 07:17:36,040 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:17:36,040 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:17:36,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:17:36,040 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:17:36,040 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:17:36,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:36,065 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:17:36,065 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:17:36,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:36,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:17:36,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:36,084 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:17:36,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:36,117 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:17:36,130 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:17:36,130 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:17:36,178 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 16 treesize of output 12 [2022-12-14 07:17:36,311 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:17:37,480 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13953#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:17:37,480 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:17:37,480 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:17:37,481 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 44 [2022-12-14 07:17:37,481 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980356942] [2022-12-14 07:17:37,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:17:37,481 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 07:17:37,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:17:37,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 07:17:37,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=2049, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 07:17:37,482 INFO L87 Difference]: Start difference. First operand 139 states and 158 transitions. Second operand has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 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) [2022-12-14 07:17:37,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:17:37,913 INFO L93 Difference]: Finished difference Result 206 states and 239 transitions. [2022-12-14 07:17:37,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 07:17:37,913 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 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 78 [2022-12-14 07:17:37,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:17:37,914 INFO L225 Difference]: With dead ends: 206 [2022-12-14 07:17:37,914 INFO L226 Difference]: Without dead ends: 86 [2022-12-14 07:17:37,915 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 172 SyntacticMatches, 33 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2044 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=520, Invalid=2902, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 07:17:37,915 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 162 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:17:37,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 19 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:17:37,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-12-14 07:17:37,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-12-14 07:17:37,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 85 states have internal predecessors, (94), 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) [2022-12-14 07:17:37,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2022-12-14 07:17:37,970 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 78 [2022-12-14 07:17:37,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:17:37,970 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2022-12-14 07:17:37,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 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) [2022-12-14 07:17:37,971 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2022-12-14 07:17:37,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-12-14 07:17:37,971 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:17:37,971 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:17:37,975 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 07:17:38,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:17:38,172 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:17:38,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:17:38,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1586768048, now seen corresponding path program 19 times [2022-12-14 07:17:38,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:17:38,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237441786] [2022-12-14 07:17:38,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:17:38,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:17:38,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:17:51,928 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 25 proven. 299 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:17:51,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:17:51,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237441786] [2022-12-14 07:17:51,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237441786] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:17:51,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399135358] [2022-12-14 07:17:51,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:17:51,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:17:51,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:17:51,930 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:17:51,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 07:17:52,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:17:52,040 WARN L261 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 284 conjunts are in the unsatisfiable core [2022-12-14 07:17:52,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:17:52,266 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 11 [2022-12-14 07:17:55,827 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:17:55,829 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 07:17:55,829 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2022-12-14 07:17:55,963 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:17:55,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:17:58,414 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 07:17:58,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1399135358] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:17:58,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110817722] [2022-12-14 07:17:58,416 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:17:58,416 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:17:58,416 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:17:58,416 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:17:58,416 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:17:58,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:58,443 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:17:58,443 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:17:58,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:58,467 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:17:58,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:17:58,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:58,486 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:17:58,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:58,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:17:58,528 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:17:58,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:17:58,562 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 16 treesize of output 12 [2022-12-14 07:17:58,688 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:18:01,028 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15147#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:18:01,028 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:18:01,028 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:18:01,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 30, 21] total 93 [2022-12-14 07:18:01,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701370288] [2022-12-14 07:18:01,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:18:01,029 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-12-14 07:18:01,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:01,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-12-14 07:18:01,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=9036, Unknown=0, NotChecked=0, Total=9506 [2022-12-14 07:18:01,031 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 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) [2022-12-14 07:18:14,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:14,072 INFO L93 Difference]: Finished difference Result 321 states and 362 transitions. [2022-12-14 07:18:14,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-12-14 07:18:14,072 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 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 85 [2022-12-14 07:18:14,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:14,073 INFO L225 Difference]: With dead ends: 321 [2022-12-14 07:18:14,073 INFO L226 Difference]: Without dead ends: 228 [2022-12-14 07:18:14,074 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 169 SyntacticMatches, 72 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9974 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=1640, Invalid=21312, Unknown=0, NotChecked=0, Total=22952 [2022-12-14 07:18:14,075 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 49 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 5392 mSolverCounterSat, 952 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 6344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 952 IncrementalHoareTripleChecker+Valid, 5392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:14,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 165 Invalid, 6344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [952 Valid, 5392 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-12-14 07:18:14,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2022-12-14 07:18:14,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 181. [2022-12-14 07:18:14,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.1222222222222222) internal successors, (202), 180 states have internal predecessors, (202), 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) [2022-12-14 07:18:14,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 202 transitions. [2022-12-14 07:18:14,189 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 202 transitions. Word has length 85 [2022-12-14 07:18:14,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:14,189 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 202 transitions. [2022-12-14 07:18:14,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 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) [2022-12-14 07:18:14,189 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 202 transitions. [2022-12-14 07:18:14,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-12-14 07:18:14,190 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:14,190 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:14,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-12-14 07:18:14,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:18:14,391 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:18:14,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:14,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1526995405, now seen corresponding path program 20 times [2022-12-14 07:18:14,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:14,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128355653] [2022-12-14 07:18:14,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:14,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:14,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:14,704 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-12-14 07:18:14,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:14,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128355653] [2022-12-14 07:18:14,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128355653] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:18:14,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756977742] [2022-12-14 07:18:14,704 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:18:14,705 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:18:14,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:18:14,705 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:18:14,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 07:18:14,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 07:18:14,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:18:14,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 07:18:14,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:18:15,039 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-12-14 07:18:15,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:18:15,210 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-12-14 07:18:15,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756977742] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:18:15,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1015373529] [2022-12-14 07:18:15,211 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:18:15,211 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:18:15,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:18:15,211 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:18:15,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:18:15,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:15,233 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:18:15,233 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:18:15,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:15,256 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:18:15,256 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:18:15,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:15,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:18:15,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:15,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:15,308 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:18:15,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:18:15,339 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 16 treesize of output 12 [2022-12-14 07:18:15,460 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:18:16,433 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16801#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:18:16,434 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:18:16,434 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:18:16,434 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2022-12-14 07:18:16,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000833816] [2022-12-14 07:18:16,434 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:18:16,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 07:18:16,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:16,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 07:18:16,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 07:18:16,435 INFO L87 Difference]: Start difference. First operand 181 states and 202 transitions. Second operand has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 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) [2022-12-14 07:18:16,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:18:16,915 INFO L93 Difference]: Finished difference Result 246 states and 280 transitions. [2022-12-14 07:18:16,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 07:18:16,915 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 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 87 [2022-12-14 07:18:16,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:18:16,916 INFO L225 Difference]: With dead ends: 246 [2022-12-14 07:18:16,916 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 07:18:16,916 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 183 SyntacticMatches, 64 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3526 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 07:18:16,917 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 305 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 375 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 305 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 375 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:18:16,917 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [305 Valid, 13 Invalid, 1012 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [375 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 07:18:16,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 07:18:16,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-12-14 07:18:16,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 94 states have internal predecessors, (103), 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) [2022-12-14 07:18:16,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2022-12-14 07:18:16,977 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 87 [2022-12-14 07:18:16,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:18:16,977 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2022-12-14 07:18:16,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 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) [2022-12-14 07:18:16,977 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2022-12-14 07:18:16,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-12-14 07:18:16,977 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:18:16,977 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:18:16,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-12-14 07:18:17,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 07:18:17,179 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:18:17,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:18:17,180 INFO L85 PathProgramCache]: Analyzing trace with hash 447249468, now seen corresponding path program 21 times [2022-12-14 07:18:17,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:18:17,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778167603] [2022-12-14 07:18:17,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:18:17,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:18:17,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:18:35,625 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 42 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:35,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:18:35,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778167603] [2022-12-14 07:18:35,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778167603] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:18:35,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043356564] [2022-12-14 07:18:35,625 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:18:35,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:18:35,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:18:35,626 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:18:35,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 07:18:35,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:18:35,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:18:35,739 WARN L261 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 318 conjunts are in the unsatisfiable core [2022-12-14 07:18:35,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:18:35,838 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 11 [2022-12-14 07:18:40,555 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:18:40,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:18:43,904 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 07:18:43,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043356564] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:18:43,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [383749336] [2022-12-14 07:18:43,905 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:18:43,906 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:18:43,906 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:18:43,906 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:18:43,906 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:18:43,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:43,927 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:18:43,927 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:18:43,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:43,956 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:18:43,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:18:43,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:43,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:18:44,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:44,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:18:44,021 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:18:44,021 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:18:44,054 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 16 treesize of output 12 [2022-12-14 07:18:44,181 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:18:47,028 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18166#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:18:47,029 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:18:47,029 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:18:47,029 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 33, 23] total 101 [2022-12-14 07:18:47,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440796619] [2022-12-14 07:18:47,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:18:47,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-12-14 07:18:47,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:18:47,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-12-14 07:18:47,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=10645, Unknown=0, NotChecked=0, Total=11130 [2022-12-14 07:18:47,031 INFO L87 Difference]: Start difference. First operand 95 states and 103 transitions. Second operand has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 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) [2022-12-14 07:19:04,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:04,959 INFO L93 Difference]: Finished difference Result 270 states and 309 transitions. [2022-12-14 07:19:04,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-12-14 07:19:04,960 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 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 94 [2022-12-14 07:19:04,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:04,961 INFO L225 Difference]: With dead ends: 270 [2022-12-14 07:19:04,961 INFO L226 Difference]: Without dead ends: 267 [2022-12-14 07:19:04,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 195 SyntacticMatches, 74 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11804 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=1904, Invalid=26826, Unknown=0, NotChecked=0, Total=28730 [2022-12-14 07:19:04,962 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 71 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 6563 mSolverCounterSat, 1272 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 7835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1272 IncrementalHoareTripleChecker+Valid, 6563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:04,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 87 Invalid, 7835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1272 Valid, 6563 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-12-14 07:19:04,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2022-12-14 07:19:05,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 161. [2022-12-14 07:19:05,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 160 states have (on average 1.125) internal successors, (180), 160 states have internal predecessors, (180), 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) [2022-12-14 07:19:05,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 180 transitions. [2022-12-14 07:19:05,091 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 180 transitions. Word has length 94 [2022-12-14 07:19:05,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:05,092 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 180 transitions. [2022-12-14 07:19:05,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 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) [2022-12-14 07:19:05,092 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 180 transitions. [2022-12-14 07:19:05,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-12-14 07:19:05,092 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:05,092 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:05,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-12-14 07:19:05,293 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 07:19:05,293 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:19:05,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:05,294 INFO L85 PathProgramCache]: Analyzing trace with hash 979129203, now seen corresponding path program 22 times [2022-12-14 07:19:05,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:05,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972559518] [2022-12-14 07:19:05,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:05,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:05,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:05,632 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 07:19:05,633 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:05,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972559518] [2022-12-14 07:19:05,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972559518] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:05,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41151098] [2022-12-14 07:19:05,633 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:19:05,633 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:05,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:05,634 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:05,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 07:19:05,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:05,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 522 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 07:19:05,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:05,909 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 07:19:05,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:06,087 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 07:19:06,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41151098] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:06,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1589213121] [2022-12-14 07:19:06,088 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:19:06,088 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:06,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:06,088 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:06,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:06,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:06,112 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:19:06,112 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:19:06,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:06,136 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:19:06,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:19:06,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:06,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:19:06,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:06,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:06,197 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:19:06,198 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:19:06,229 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 16 treesize of output 12 [2022-12-14 07:19:06,357 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:07,136 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19741#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:07,136 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:07,136 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:07,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-12-14 07:19:07,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150320482] [2022-12-14 07:19:07,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:07,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 07:19:07,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:07,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 07:19:07,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 07:19:07,137 INFO L87 Difference]: Start difference. First operand 161 states and 180 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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) [2022-12-14 07:19:07,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:07,757 INFO L93 Difference]: Finished difference Result 381 states and 425 transitions. [2022-12-14 07:19:07,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 07:19:07,758 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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 95 [2022-12-14 07:19:07,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:07,759 INFO L225 Difference]: With dead ends: 381 [2022-12-14 07:19:07,759 INFO L226 Difference]: Without dead ends: 162 [2022-12-14 07:19:07,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 218 SyntacticMatches, 50 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1993 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=500, Invalid=1950, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 07:19:07,760 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 734 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 857 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:07,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 23 Invalid, 857 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 734 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:19:07,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-12-14 07:19:07,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2022-12-14 07:19:07,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.124223602484472) internal successors, (181), 161 states have internal predecessors, (181), 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) [2022-12-14 07:19:07,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 181 transitions. [2022-12-14 07:19:07,890 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 181 transitions. Word has length 95 [2022-12-14 07:19:07,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:07,891 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 181 transitions. [2022-12-14 07:19:07,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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) [2022-12-14 07:19:07,891 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 181 transitions. [2022-12-14 07:19:07,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-12-14 07:19:07,891 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:07,891 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:07,896 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 07:19:08,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:08,092 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:19:08,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:08,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1640848070, now seen corresponding path program 23 times [2022-12-14 07:19:08,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:08,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883953282] [2022-12-14 07:19:08,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:08,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:08,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:08,350 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-12-14 07:19:08,350 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:08,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883953282] [2022-12-14 07:19:08,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883953282] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:08,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865367992] [2022-12-14 07:19:08,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:19:08,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:08,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:08,352 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:08,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 07:19:08,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 07:19:08,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:19:08,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 07:19:08,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:08,724 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-12-14 07:19:08,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:08,866 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-12-14 07:19:08,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1865367992] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:08,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511023781] [2022-12-14 07:19:08,867 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:19:08,867 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:08,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:08,867 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:08,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:08,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:08,890 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:19:08,890 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:19:08,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:08,914 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:19:08,914 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:19:08,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:08,930 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:19:08,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:08,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:08,972 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:19:08,973 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:19:08,998 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 16 treesize of output 12 [2022-12-14 07:19:09,124 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:09,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21444#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:09,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:09,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:09,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-12-14 07:19:09,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956946084] [2022-12-14 07:19:09,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:09,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 07:19:09,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:09,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 07:19:09,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=1251, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 07:19:09,833 INFO L87 Difference]: Start difference. First operand 162 states and 181 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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) [2022-12-14 07:19:10,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:19:10,357 INFO L93 Difference]: Finished difference Result 243 states and 276 transitions. [2022-12-14 07:19:10,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 07:19:10,357 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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 96 [2022-12-14 07:19:10,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:19:10,358 INFO L225 Difference]: With dead ends: 243 [2022-12-14 07:19:10,358 INFO L226 Difference]: Without dead ends: 115 [2022-12-14 07:19:10,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 231 SyntacticMatches, 40 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1963 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=618, Invalid=1932, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 07:19:10,359 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 224 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 245 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 245 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:19:10,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 9 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [245 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:19:10,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-12-14 07:19:10,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 104. [2022-12-14 07:19:10,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.087378640776699) internal successors, (112), 103 states have internal predecessors, (112), 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) [2022-12-14 07:19:10,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2022-12-14 07:19:10,449 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 96 [2022-12-14 07:19:10,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:19:10,449 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2022-12-14 07:19:10,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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) [2022-12-14 07:19:10,449 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2022-12-14 07:19:10,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-12-14 07:19:10,449 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:19:10,449 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:19:10,454 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 07:19:10,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-12-14 07:19:10,651 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:19:10,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:19:10,652 INFO L85 PathProgramCache]: Analyzing trace with hash 1757628880, now seen corresponding path program 24 times [2022-12-14 07:19:10,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:19:10,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126726930] [2022-12-14 07:19:10,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:19:10,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:19:11,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:19:33,353 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 77 proven. 418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:33,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:19:33,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126726930] [2022-12-14 07:19:33,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126726930] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:19:33,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802329844] [2022-12-14 07:19:33,354 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:19:33,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:19:33,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:19:33,354 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:19:33,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 07:19:33,473 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:19:33,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:19:33,478 WARN L261 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 354 conjunts are in the unsatisfiable core [2022-12-14 07:19:33,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:19:34,176 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 11 [2022-12-14 07:19:40,509 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:19:40,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:19:44,780 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 440 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 07:19:44,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802329844] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:19:44,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [855539284] [2022-12-14 07:19:44,781 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:19:44,781 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:19:44,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:19:44,781 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:19:44,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:19:44,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:44,808 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:19:44,808 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:19:44,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:44,830 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:19:44,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:19:44,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:44,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:19:44,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:19:44,883 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:19:44,897 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:19:44,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:19:44,959 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 16 treesize of output 12 [2022-12-14 07:19:45,076 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:19:49,773 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22878#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:19:49,773 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:19:49,773 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:19:49,773 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 36, 25] total 114 [2022-12-14 07:19:49,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608405174] [2022-12-14 07:19:49,773 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:19:49,774 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-12-14 07:19:49,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:19:49,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-12-14 07:19:49,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=13464, Unknown=0, NotChecked=0, Total=14042 [2022-12-14 07:19:49,776 INFO L87 Difference]: Start difference. First operand 104 states and 112 transitions. Second operand has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 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) [2022-12-14 07:20:09,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:20:09,919 INFO L93 Difference]: Finished difference Result 208 states and 236 transitions. [2022-12-14 07:20:09,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-12-14 07:20:09,920 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 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 103 [2022-12-14 07:20:09,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:20:09,920 INFO L225 Difference]: With dead ends: 208 [2022-12-14 07:20:09,920 INFO L226 Difference]: Without dead ends: 205 [2022-12-14 07:20:09,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 172 SyntacticMatches, 120 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15075 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=1960, Invalid=28490, Unknown=0, NotChecked=0, Total=30450 [2022-12-14 07:20:09,922 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 103 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 7049 mSolverCounterSat, 1533 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 8582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1533 IncrementalHoareTripleChecker+Valid, 7049 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2022-12-14 07:20:09,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 97 Invalid, 8582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1533 Valid, 7049 Invalid, 0 Unknown, 0 Unchecked, 7.5s Time] [2022-12-14 07:20:09,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-12-14 07:20:10,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 105. [2022-12-14 07:20:10,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0865384615384615) internal successors, (113), 104 states have internal predecessors, (113), 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) [2022-12-14 07:20:10,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 113 transitions. [2022-12-14 07:20:10,033 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 113 transitions. Word has length 103 [2022-12-14 07:20:10,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:20:10,033 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 113 transitions. [2022-12-14 07:20:10,033 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 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) [2022-12-14 07:20:10,033 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 113 transitions. [2022-12-14 07:20:10,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-12-14 07:20:10,033 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:20:10,033 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:20:10,038 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 07:20:10,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 07:20:10,235 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:20:10,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:20:10,235 INFO L85 PathProgramCache]: Analyzing trace with hash -1348781985, now seen corresponding path program 25 times [2022-12-14 07:20:10,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:20:10,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111017882] [2022-12-14 07:20:10,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:10,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:20:10,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:10,619 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-12-14 07:20:10,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:20:10,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111017882] [2022-12-14 07:20:10,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111017882] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:20:10,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452928639] [2022-12-14 07:20:10,619 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:20:10,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:10,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:20:10,620 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:20:10,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 07:20:10,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:10,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 07:20:10,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:20:10,989 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-12-14 07:20:10,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:20:11,199 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-12-14 07:20:11,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452928639] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:20:11,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643373462] [2022-12-14 07:20:11,200 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:20:11,200 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:20:11,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:20:11,200 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:20:11,200 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:20:11,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:11,226 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:20:11,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:20:11,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:11,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:20:11,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:11,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:20:11,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:11,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:11,285 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:20:11,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:20:11,311 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 16 treesize of output 12 [2022-12-14 07:20:11,421 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:20:12,094 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24261#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:20:12,094 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:20:12,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:20:12,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-12-14 07:20:12,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141295410] [2022-12-14 07:20:12,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:20:12,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 07:20:12,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:20:12,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 07:20:12,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1442, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 07:20:12,095 INFO L87 Difference]: Start difference. First operand 105 states and 113 transitions. Second operand has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 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) [2022-12-14 07:20:12,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:20:12,696 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2022-12-14 07:20:12,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 07:20:12,697 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 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 104 [2022-12-14 07:20:12,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:20:12,698 INFO L225 Difference]: With dead ends: 276 [2022-12-14 07:20:12,698 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 07:20:12,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 250 SyntacticMatches, 44 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1972 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=586, Invalid=2276, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 07:20:12,699 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:20:12,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 17 Invalid, 848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 07:20:12,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 07:20:12,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-12-14 07:20:12,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 105 states have internal predecessors, (114), 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) [2022-12-14 07:20:12,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2022-12-14 07:20:12,810 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 104 [2022-12-14 07:20:12,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:20:12,810 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2022-12-14 07:20:12,810 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 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) [2022-12-14 07:20:12,810 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2022-12-14 07:20:12,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-12-14 07:20:12,811 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:20:12,811 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:20:12,815 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 07:20:13,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:13,013 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:20:13,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:20:13,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1926119828, now seen corresponding path program 26 times [2022-12-14 07:20:13,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:20:13,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955243372] [2022-12-14 07:20:13,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:13,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:20:13,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:13,352 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-12-14 07:20:13,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:20:13,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955243372] [2022-12-14 07:20:13,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955243372] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:20:13,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639348654] [2022-12-14 07:20:13,353 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:20:13,353 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:13,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:20:13,354 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:20:13,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 07:20:13,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 07:20:13,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:20:13,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 07:20:13,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:20:13,882 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-12-14 07:20:13,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:20:14,181 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-12-14 07:20:14,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639348654] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:20:14,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325263769] [2022-12-14 07:20:14,182 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:20:14,182 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:20:14,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:20:14,182 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:20:14,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:20:14,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:14,211 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:20:14,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:20:14,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:14,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:20:14,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:14,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:20:14,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:14,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:14,280 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:20:14,280 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:20:14,307 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 16 treesize of output 12 [2022-12-14 07:20:14,424 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:20:16,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25722#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:20:16,121 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:20:16,121 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:20:16,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 59 [2022-12-14 07:20:16,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145037726] [2022-12-14 07:20:16,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:20:16,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 07:20:16,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:20:16,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 07:20:16,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=3525, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 07:20:16,123 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 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) [2022-12-14 07:20:16,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:20:16,713 INFO L93 Difference]: Finished difference Result 194 states and 215 transitions. [2022-12-14 07:20:16,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 07:20:16,713 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 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 105 [2022-12-14 07:20:16,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:20:16,714 INFO L225 Difference]: With dead ends: 194 [2022-12-14 07:20:16,714 INFO L226 Difference]: Without dead ends: 113 [2022-12-14 07:20:16,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 220 SyntacticMatches, 68 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5009 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=886, Invalid=4966, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 07:20:16,715 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 317 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 397 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 898 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:20:16,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [317 Valid, 23 Invalid, 898 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:20:16,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-12-14 07:20:16,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-12-14 07:20:16,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0803571428571428) internal successors, (121), 112 states have internal predecessors, (121), 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) [2022-12-14 07:20:16,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2022-12-14 07:20:16,840 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 105 [2022-12-14 07:20:16,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:20:16,840 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2022-12-14 07:20:16,841 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 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) [2022-12-14 07:20:16,841 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2022-12-14 07:20:16,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-12-14 07:20:16,841 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:20:16,841 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:20:16,846 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 07:20:17,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 07:20:17,042 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:20:17,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:20:17,043 INFO L85 PathProgramCache]: Analyzing trace with hash 57312444, now seen corresponding path program 27 times [2022-12-14 07:20:17,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:20:17,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714765680] [2022-12-14 07:20:17,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:20:17,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:20:17,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:20:43,645 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 93 proven. 501 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:43,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:20:43,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714765680] [2022-12-14 07:20:43,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714765680] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:20:43,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844749361] [2022-12-14 07:20:43,645 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:20:43,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:20:43,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:20:43,646 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:20:43,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 07:20:43,816 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:20:43,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:20:43,821 WARN L261 TraceCheckSpWp]: Trace formula consists of 615 conjuncts, 386 conjunts are in the unsatisfiable core [2022-12-14 07:20:43,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:20:44,355 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 11 [2022-12-14 07:20:50,579 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:20:50,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:20:55,679 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 07:20:55,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844749361] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:20:55,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1750631926] [2022-12-14 07:20:55,680 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:20:55,680 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:20:55,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:20:55,680 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:20:55,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:20:55,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:55,711 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:20:55,711 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:20:55,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:55,741 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:20:55,741 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:20:55,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:55,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:20:55,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:20:55,792 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:20:55,812 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:20:55,813 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:20:55,870 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 16 treesize of output 12 [2022-12-14 07:20:56,005 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:21:02,241 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27160#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:21:02,241 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:21:02,241 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:21:02,242 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 39, 27] total 128 [2022-12-14 07:21:02,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271686765] [2022-12-14 07:21:02,242 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:21:02,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2022-12-14 07:21:02,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:21:02,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2022-12-14 07:21:02,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=16851, Unknown=0, NotChecked=0, Total=17556 [2022-12-14 07:21:02,244 INFO L87 Difference]: Start difference. First operand 113 states and 121 transitions. Second operand has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 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) [2022-12-14 07:21:22,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:21:22,657 INFO L93 Difference]: Finished difference Result 224 states and 252 transitions. [2022-12-14 07:21:22,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-12-14 07:21:22,658 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 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 112 [2022-12-14 07:21:22,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:21:22,658 INFO L225 Difference]: With dead ends: 224 [2022-12-14 07:21:22,658 INFO L226 Difference]: Without dead ends: 221 [2022-12-14 07:21:22,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 182 SyntacticMatches, 132 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20658 ImplicationChecksByTransitivity, 37.2s TimeCoverageRelationStatistics Valid=2306, Invalid=34750, Unknown=0, NotChecked=0, Total=37056 [2022-12-14 07:21:22,660 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 87 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 8076 mSolverCounterSat, 1556 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 9632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1556 IncrementalHoareTripleChecker+Valid, 8076 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:21:22,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 105 Invalid, 9632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1556 Valid, 8076 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2022-12-14 07:21:22,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-12-14 07:21:22,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 114. [2022-12-14 07:21:22,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.079646017699115) internal successors, (122), 113 states have internal predecessors, (122), 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) [2022-12-14 07:21:22,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2022-12-14 07:21:22,800 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 112 [2022-12-14 07:21:22,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:21:22,800 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2022-12-14 07:21:22,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 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) [2022-12-14 07:21:22,800 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2022-12-14 07:21:22,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-12-14 07:21:22,801 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:21:22,801 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:21:22,806 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-12-14 07:21:23,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 07:21:23,002 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:21:23,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:21:23,003 INFO L85 PathProgramCache]: Analyzing trace with hash 1775983347, now seen corresponding path program 28 times [2022-12-14 07:21:23,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:21:23,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294995663] [2022-12-14 07:21:23,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:21:23,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:21:23,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:21:23,381 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-12-14 07:21:23,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:21:23,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294995663] [2022-12-14 07:21:23,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294995663] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:21:23,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548558968] [2022-12-14 07:21:23,382 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:21:23,382 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:21:23,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:21:23,383 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:21:23,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 07:21:23,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:21:23,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 07:21:23,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:21:23,757 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-12-14 07:21:23,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:21:23,980 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-12-14 07:21:23,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1548558968] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:21:23,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [25505380] [2022-12-14 07:21:23,981 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:21:23,981 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:21:23,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:21:23,981 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:21:23,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:21:23,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:24,005 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:21:24,005 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:21:24,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:24,027 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:21:24,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:21:24,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:24,041 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:21:24,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:24,069 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:21:24,084 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:21:24,084 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:21:24,137 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 16 treesize of output 12 [2022-12-14 07:21:24,253 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:21:25,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28658#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:21:25,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:21:25,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:21:25,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-12-14 07:21:25,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216389935] [2022-12-14 07:21:25,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:21:25,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 07:21:25,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:21:25,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 07:21:25,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1651, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 07:21:25,711 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 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) [2022-12-14 07:21:26,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:21:26,638 INFO L93 Difference]: Finished difference Result 300 states and 323 transitions. [2022-12-14 07:21:26,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 07:21:26,638 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 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 113 [2022-12-14 07:21:26,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:21:26,639 INFO L225 Difference]: With dead ends: 300 [2022-12-14 07:21:26,639 INFO L226 Difference]: Without dead ends: 115 [2022-12-14 07:21:26,640 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 235 SyntacticMatches, 85 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3750 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=679, Invalid=2627, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 07:21:26,640 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1377 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 1532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 1377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 07:21:26,640 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 29 Invalid, 1532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 1377 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 07:21:26,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-12-14 07:21:26,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-12-14 07:21:26,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0789473684210527) internal successors, (123), 114 states have internal predecessors, (123), 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) [2022-12-14 07:21:26,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 123 transitions. [2022-12-14 07:21:26,780 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 123 transitions. Word has length 113 [2022-12-14 07:21:26,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:21:26,780 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 123 transitions. [2022-12-14 07:21:26,780 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 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) [2022-12-14 07:21:26,780 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 123 transitions. [2022-12-14 07:21:26,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-12-14 07:21:26,780 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:21:26,781 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:21:26,785 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-12-14 07:21:26,981 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:21:26,982 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:21:26,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:21:26,983 INFO L85 PathProgramCache]: Analyzing trace with hash 1307988870, now seen corresponding path program 29 times [2022-12-14 07:21:26,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:21:26,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854931912] [2022-12-14 07:21:26,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:21:26,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:21:27,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:21:27,339 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-12-14 07:21:27,339 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:21:27,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854931912] [2022-12-14 07:21:27,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854931912] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:21:27,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103311777] [2022-12-14 07:21:27,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:21:27,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:21:27,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:21:27,340 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:21:27,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 07:21:27,601 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 07:21:27,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:21:27,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 07:21:27,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:21:27,751 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-12-14 07:21:27,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:21:27,900 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-12-14 07:21:27,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103311777] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:21:27,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1559863214] [2022-12-14 07:21:27,901 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:21:27,901 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:21:27,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:21:27,901 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:21:27,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:21:27,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:27,926 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:21:27,926 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:21:27,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:27,947 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:21:27,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:21:27,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:27,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:21:27,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:27,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:21:27,999 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:21:27,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:21:28,029 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 16 treesize of output 12 [2022-12-14 07:21:28,145 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:21:29,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30223#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:21:29,293 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:21:29,293 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:21:29,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-12-14 07:21:29,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296956930] [2022-12-14 07:21:29,293 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:21:29,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 07:21:29,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:21:29,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 07:21:29,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=1657, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 07:21:29,294 INFO L87 Difference]: Start difference. First operand 115 states and 123 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 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) [2022-12-14 07:21:29,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:21:29,724 INFO L93 Difference]: Finished difference Result 210 states and 231 transitions. [2022-12-14 07:21:29,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 07:21:29,724 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 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 114 [2022-12-14 07:21:29,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:21:29,725 INFO L225 Difference]: With dead ends: 210 [2022-12-14 07:21:29,725 INFO L226 Difference]: Without dead ends: 122 [2022-12-14 07:21:29,725 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 226 SyntacticMatches, 97 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5155 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=843, Invalid=2579, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 07:21:29,726 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 392 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 392 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 07:21:29,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [392 Valid, 19 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 07:21:29,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-12-14 07:21:29,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2022-12-14 07:21:29,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0743801652892562) internal successors, (130), 121 states have internal predecessors, (130), 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) [2022-12-14 07:21:29,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2022-12-14 07:21:29,878 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 114 [2022-12-14 07:21:29,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:21:29,878 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2022-12-14 07:21:29,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 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) [2022-12-14 07:21:29,878 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2022-12-14 07:21:29,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-12-14 07:21:29,878 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:21:29,878 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:21:29,884 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 07:21:30,079 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:21:30,080 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:21:30,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:21:30,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1731599440, now seen corresponding path program 30 times [2022-12-14 07:21:30,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:21:30,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492695562] [2022-12-14 07:21:30,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:21:30,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:21:30,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:22:02,444 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 90 proven. 612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:22:02,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:22:02,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492695562] [2022-12-14 07:22:02,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492695562] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:22:02,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995199431] [2022-12-14 07:22:02,444 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:22:02,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:22:02,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:22:02,445 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:22:02,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 07:22:02,578 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:22:02,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:22:02,585 WARN L261 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 422 conjunts are in the unsatisfiable core [2022-12-14 07:22:02,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:22:02,732 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 13 treesize of output 9 [2022-12-14 07:22:09,876 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:22:09,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:22:15,996 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 624 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 07:22:15,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995199431] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:22:15,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [597875002] [2022-12-14 07:22:15,997 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:22:15,997 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:22:15,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:22:15,997 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:22:15,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:22:16,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:16,025 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:22:16,025 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:22:16,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:16,055 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:22:16,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:22:16,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:16,074 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:22:16,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:16,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:16,124 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:22:16,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:22:16,181 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 16 treesize of output 12 [2022-12-14 07:22:16,300 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:22:22,865 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31757#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:22:22,866 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:22:22,866 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:22:22,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 42, 29] total 132 [2022-12-14 07:22:22,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550081096] [2022-12-14 07:22:22,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:22:22,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2022-12-14 07:22:22,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:22:22,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2022-12-14 07:22:22,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=850, Invalid=17782, Unknown=0, NotChecked=0, Total=18632 [2022-12-14 07:22:22,868 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 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) [2022-12-14 07:22:43,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:22:43,992 INFO L93 Difference]: Finished difference Result 240 states and 268 transitions. [2022-12-14 07:22:43,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-12-14 07:22:43,992 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 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 121 [2022-12-14 07:22:43,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:22:43,993 INFO L225 Difference]: With dead ends: 240 [2022-12-14 07:22:43,994 INFO L226 Difference]: Without dead ends: 237 [2022-12-14 07:22:43,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 193 SyntacticMatches, 153 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22352 ImplicationChecksByTransitivity, 39.2s TimeCoverageRelationStatistics Valid=2434, Invalid=35008, Unknown=0, NotChecked=0, Total=37442 [2022-12-14 07:22:43,996 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 62 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 8820 mSolverCounterSat, 1460 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 10280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1460 IncrementalHoareTripleChecker+Valid, 8820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2022-12-14 07:22:43,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 103 Invalid, 10280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1460 Valid, 8820 Invalid, 0 Unknown, 0 Unchecked, 8.6s Time] [2022-12-14 07:22:43,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-12-14 07:22:44,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 123. [2022-12-14 07:22:44,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0737704918032787) internal successors, (131), 122 states have internal predecessors, (131), 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) [2022-12-14 07:22:44,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 131 transitions. [2022-12-14 07:22:44,196 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 131 transitions. Word has length 121 [2022-12-14 07:22:44,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:22:44,196 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 131 transitions. [2022-12-14 07:22:44,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 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) [2022-12-14 07:22:44,197 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 131 transitions. [2022-12-14 07:22:44,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-12-14 07:22:44,197 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:22:44,197 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:22:44,203 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 07:22:44,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:22:44,399 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:22:44,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:22:44,400 INFO L85 PathProgramCache]: Analyzing trace with hash 2139272671, now seen corresponding path program 31 times [2022-12-14 07:22:44,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:22:44,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151133823] [2022-12-14 07:22:44,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:22:44,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:22:44,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:22:44,942 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-12-14 07:22:44,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:22:44,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151133823] [2022-12-14 07:22:44,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151133823] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:22:44,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [420516777] [2022-12-14 07:22:44,943 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:22:44,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:22:44,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:22:44,944 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:22:44,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 07:22:45,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:22:45,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 07:22:45,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:22:45,378 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-12-14 07:22:45,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:22:45,657 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-12-14 07:22:45,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [420516777] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:22:45,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [987464122] [2022-12-14 07:22:45,659 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:22:45,659 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:22:45,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:22:45,659 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:22:45,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:22:45,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:45,688 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:22:45,688 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:22:45,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:45,715 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:22:45,716 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:22:45,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:45,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:22:45,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:45,762 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:22:45,776 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:22:45,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:22:45,834 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 16 treesize of output 12 [2022-12-14 07:22:45,945 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:22:46,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33356#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:22:46,956 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:22:46,956 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:22:46,957 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2022-12-14 07:22:46,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174294850] [2022-12-14 07:22:46,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:22:46,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 07:22:46,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:22:46,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 07:22:46,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=1874, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 07:22:46,958 INFO L87 Difference]: Start difference. First operand 123 states and 131 transitions. Second operand has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 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) [2022-12-14 07:22:47,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:22:47,999 INFO L93 Difference]: Finished difference Result 324 states and 347 transitions. [2022-12-14 07:22:47,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 07:22:47,999 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 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 122 [2022-12-14 07:22:48,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:22:48,000 INFO L225 Difference]: With dead ends: 324 [2022-12-14 07:22:48,000 INFO L226 Difference]: Without dead ends: 124 [2022-12-14 07:22:48,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 293 SyntacticMatches, 53 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=779, Invalid=3003, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 07:22:48,001 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 07:22:48,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 21 Invalid, 1154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 982 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 07:22:48,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-12-14 07:22:48,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2022-12-14 07:22:48,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.0731707317073171) internal successors, (132), 123 states have internal predecessors, (132), 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) [2022-12-14 07:22:48,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 132 transitions. [2022-12-14 07:22:48,173 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 132 transitions. Word has length 122 [2022-12-14 07:22:48,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:22:48,173 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 132 transitions. [2022-12-14 07:22:48,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 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) [2022-12-14 07:22:48,173 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 132 transitions. [2022-12-14 07:22:48,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 07:22:48,174 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:22:48,174 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:22:48,179 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 07:22:48,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-12-14 07:22:48,375 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:22:48,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:22:48,376 INFO L85 PathProgramCache]: Analyzing trace with hash 74101420, now seen corresponding path program 32 times [2022-12-14 07:22:48,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:22:48,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889802093] [2022-12-14 07:22:48,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:22:48,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:22:48,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:22:48,815 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-12-14 07:22:48,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:22:48,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889802093] [2022-12-14 07:22:48,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889802093] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:22:48,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384826672] [2022-12-14 07:22:48,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:22:48,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:22:48,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:22:48,817 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:22:48,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 07:22:49,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 07:22:49,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:22:49,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 07:22:49,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:22:49,617 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-12-14 07:22:49,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:22:50,050 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-12-14 07:22:50,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384826672] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:22:50,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [437027757] [2022-12-14 07:22:50,051 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:22:50,051 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:22:50,051 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:22:50,051 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:22:50,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:22:50,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:50,072 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:22:50,072 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:22:50,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:50,078 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:22:50,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:50,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:22:50,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:22:50,119 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:22:50,135 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:22:50,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:22:50,220 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 16 treesize of output 12 [2022-12-14 07:22:50,365 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:22:53,072 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35071#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:22:53,072 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:22:53,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:22:53,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 69 [2022-12-14 07:22:53,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174335349] [2022-12-14 07:22:53,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:22:53,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-12-14 07:22:53,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:22:53,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-12-14 07:22:53,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=673, Invalid=4729, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 07:22:53,074 INFO L87 Difference]: Start difference. First operand 124 states and 132 transitions. Second operand has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 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) [2022-12-14 07:22:54,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:22:54,045 INFO L93 Difference]: Finished difference Result 226 states and 247 transitions. [2022-12-14 07:22:54,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 07:22:54,045 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 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 123 [2022-12-14 07:22:54,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:22:54,046 INFO L225 Difference]: With dead ends: 226 [2022-12-14 07:22:54,046 INFO L226 Difference]: Without dead ends: 131 [2022-12-14 07:22:54,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 245 SyntacticMatches, 93 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7769 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1185, Invalid=6647, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 07:22:54,047 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 870 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 379 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 870 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 379 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:22:54,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [870 Valid, 23 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [379 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 07:22:54,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-12-14 07:22:54,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2022-12-14 07:22:54,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0692307692307692) internal successors, (139), 130 states have internal predecessors, (139), 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) [2022-12-14 07:22:54,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 139 transitions. [2022-12-14 07:22:54,372 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 139 transitions. Word has length 123 [2022-12-14 07:22:54,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:22:54,372 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 139 transitions. [2022-12-14 07:22:54,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 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) [2022-12-14 07:22:54,373 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 139 transitions. [2022-12-14 07:22:54,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-12-14 07:22:54,373 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:22:54,373 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:22:54,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 07:22:54,574 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 07:22:54,574 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:22:54,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:22:54,575 INFO L85 PathProgramCache]: Analyzing trace with hash -723210948, now seen corresponding path program 33 times [2022-12-14 07:22:54,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:22:54,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714607618] [2022-12-14 07:22:54,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:22:54,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:22:55,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:23:34,536 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 120 proven. 699 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:23:34,536 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:23:34,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714607618] [2022-12-14 07:23:34,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714607618] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:23:34,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330208564] [2022-12-14 07:23:34,536 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:23:34,536 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:23:34,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:23:34,537 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:23:34,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 07:23:34,744 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:23:34,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:23:34,751 WARN L261 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 454 conjunts are in the unsatisfiable core [2022-12-14 07:23:34,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:23:35,234 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 11 [2022-12-14 07:23:45,139 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:23:45,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:23:52,527 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 0 proven. 728 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-12-14 07:23:52,527 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330208564] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:23:52,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053193416] [2022-12-14 07:23:52,528 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:23:52,529 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:23:52,529 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:23:52,529 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:23:52,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:23:52,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:23:52,561 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:23:52,561 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:23:52,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:23:52,591 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:23:52,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:23:52,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:23:52,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:23:52,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:23:52,642 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:23:52,661 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:23:52,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:23:52,707 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 16 treesize of output 12 [2022-12-14 07:23:52,819 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:24:04,759 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36741#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:24:04,759 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:24:04,759 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:24:04,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 45, 31] total 146 [2022-12-14 07:24:04,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430944703] [2022-12-14 07:24:04,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:24:04,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2022-12-14 07:24:04,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:24:04,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2022-12-14 07:24:04,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1010, Invalid=21640, Unknown=0, NotChecked=0, Total=22650 [2022-12-14 07:24:04,761 INFO L87 Difference]: Start difference. First operand 131 states and 139 transitions. Second operand has 146 states, 146 states have (on average 2.2465753424657535) internal successors, (328), 146 states have internal predecessors, (328), 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) [2022-12-14 07:24:29,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:24:29,589 INFO L93 Difference]: Finished difference Result 256 states and 284 transitions. [2022-12-14 07:24:29,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-12-14 07:24:29,590 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 2.2465753424657535) internal successors, (328), 146 states have internal predecessors, (328), 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 130 [2022-12-14 07:24:29,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:24:29,591 INFO L225 Difference]: With dead ends: 256 [2022-12-14 07:24:29,591 INFO L226 Difference]: Without dead ends: 253 [2022-12-14 07:24:29,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 582 GetRequests, 175 SyntacticMatches, 193 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32755 ImplicationChecksByTransitivity, 52.2s TimeCoverageRelationStatistics Valid=2971, Invalid=43469, Unknown=0, NotChecked=0, Total=46440 [2022-12-14 07:24:29,592 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 80 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 10006 mSolverCounterSat, 1134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 11140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1134 IncrementalHoareTripleChecker+Valid, 10006 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2022-12-14 07:24:29,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 119 Invalid, 11140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1134 Valid, 10006 Invalid, 0 Unknown, 0 Unchecked, 9.5s Time] [2022-12-14 07:24:29,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2022-12-14 07:24:29,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 132. [2022-12-14 07:24:29,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.0687022900763359) internal successors, (140), 131 states have internal predecessors, (140), 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) [2022-12-14 07:24:29,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 140 transitions. [2022-12-14 07:24:29,807 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 140 transitions. Word has length 130 [2022-12-14 07:24:29,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:24:29,807 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 140 transitions. [2022-12-14 07:24:29,807 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 2.2465753424657535) internal successors, (328), 146 states have internal predecessors, (328), 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) [2022-12-14 07:24:29,807 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 140 transitions. [2022-12-14 07:24:29,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-12-14 07:24:29,807 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:24:29,808 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:24:29,813 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-12-14 07:24:30,008 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:24:30,008 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:24:30,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:24:30,008 INFO L85 PathProgramCache]: Analyzing trace with hash -945405325, now seen corresponding path program 34 times [2022-12-14 07:24:30,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:24:30,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405074879] [2022-12-14 07:24:30,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:24:30,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:24:30,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:24:30,534 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 637 trivial. 0 not checked. [2022-12-14 07:24:30,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:24:30,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405074879] [2022-12-14 07:24:30,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405074879] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:24:30,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454215242] [2022-12-14 07:24:30,535 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:24:30,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:24:30,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:24:30,535 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:24:30,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 07:24:30,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:24:30,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 07:24:30,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:24:31,020 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 637 trivial. 0 not checked. [2022-12-14 07:24:31,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:24:31,320 INFO L134 CoverageAnalysis]: Checked inductivity of 833 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 637 trivial. 0 not checked. [2022-12-14 07:24:31,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454215242] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:24:31,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [732295121] [2022-12-14 07:24:31,321 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:24:31,321 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:24:31,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:24:31,321 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:24:31,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:24:31,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:31,343 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:24:31,343 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:24:31,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:31,362 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:24:31,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:24:31,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:31,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:24:31,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:31,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:31,414 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:24:31,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:24:31,440 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 16 treesize of output 12 [2022-12-14 07:24:31,590 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:24:32,938 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38463#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:24:32,938 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:24:32,938 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:24:32,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2022-12-14 07:24:32,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21438299] [2022-12-14 07:24:32,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:24:32,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 07:24:32,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:24:32,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 07:24:32,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=2111, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 07:24:32,940 INFO L87 Difference]: Start difference. First operand 132 states and 140 transitions. Second operand has 47 states, 47 states have (on average 1.4042553191489362) internal successors, (66), 47 states have internal predecessors, (66), 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) [2022-12-14 07:24:33,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:24:33,926 INFO L93 Difference]: Finished difference Result 348 states and 371 transitions. [2022-12-14 07:24:33,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 07:24:33,927 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4042553191489362) internal successors, (66), 47 states have internal predecessors, (66), 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 131 [2022-12-14 07:24:33,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:24:33,927 INFO L225 Difference]: With dead ends: 348 [2022-12-14 07:24:33,927 INFO L226 Difference]: Without dead ends: 133 [2022-12-14 07:24:33,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 288 SyntacticMatches, 84 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4315 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=886, Invalid=3404, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 07:24:33,928 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 920 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 1083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 920 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 07:24:33,928 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 15 Invalid, 1083 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 920 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 07:24:33,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-12-14 07:24:34,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2022-12-14 07:24:34,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0681818181818181) internal successors, (141), 132 states have internal predecessors, (141), 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) [2022-12-14 07:24:34,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2022-12-14 07:24:34,139 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 131 [2022-12-14 07:24:34,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:24:34,140 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2022-12-14 07:24:34,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.4042553191489362) internal successors, (66), 47 states have internal predecessors, (66), 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) [2022-12-14 07:24:34,140 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2022-12-14 07:24:34,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-12-14 07:24:34,140 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:24:34,140 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:24:34,145 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 07:24:34,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-12-14 07:24:34,341 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:24:34,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:24:34,342 INFO L85 PathProgramCache]: Analyzing trace with hash -1060545466, now seen corresponding path program 35 times [2022-12-14 07:24:34,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:24:34,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917635597] [2022-12-14 07:24:34,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:24:34,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:24:34,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:24:34,878 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2022-12-14 07:24:34,878 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:24:34,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917635597] [2022-12-14 07:24:34,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917635597] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:24:34,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6168103] [2022-12-14 07:24:34,878 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:24:34,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:24:34,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:24:34,879 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:24:34,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 07:24:35,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 07:24:35,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:24:35,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 727 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 07:24:35,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:24:35,538 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2022-12-14 07:24:35,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:24:35,758 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2022-12-14 07:24:35,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6168103] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:24:35,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575606423] [2022-12-14 07:24:35,759 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:24:35,759 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:24:35,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:24:35,760 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:24:35,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:24:35,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:35,786 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:24:35,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:24:35,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:35,796 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:24:35,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:35,815 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:24:35,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:35,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:24:35,871 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:24:35,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:24:35,898 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 16 treesize of output 12 [2022-12-14 07:24:36,016 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:24:37,323 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40278#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:24:37,324 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:24:37,324 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:24:37,324 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2022-12-14 07:24:37,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146087489] [2022-12-14 07:24:37,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:24:37,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 07:24:37,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:24:37,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 07:24:37,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=2119, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 07:24:37,325 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand has 47 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 47 states have internal predecessors, (85), 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) [2022-12-14 07:24:38,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:24:38,085 INFO L93 Difference]: Finished difference Result 242 states and 263 transitions. [2022-12-14 07:24:38,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 07:24:38,085 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 47 states have internal predecessors, (85), 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 132 [2022-12-14 07:24:38,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:24:38,085 INFO L225 Difference]: With dead ends: 242 [2022-12-14 07:24:38,085 INFO L226 Difference]: Without dead ends: 140 [2022-12-14 07:24:38,086 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 305 SyntacticMatches, 70 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4475 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1104, Invalid=3318, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 07:24:38,086 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 275 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 391 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 391 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:24:38,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [275 Valid, 11 Invalid, 748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [391 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 07:24:38,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-12-14 07:24:38,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2022-12-14 07:24:38,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.064748201438849) internal successors, (148), 139 states have internal predecessors, (148), 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) [2022-12-14 07:24:38,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 148 transitions. [2022-12-14 07:24:38,314 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 148 transitions. Word has length 132 [2022-12-14 07:24:38,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:24:38,315 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 148 transitions. [2022-12-14 07:24:38,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 47 states have internal predecessors, (85), 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) [2022-12-14 07:24:38,315 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 148 transitions. [2022-12-14 07:24:38,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-12-14 07:24:38,315 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:24:38,315 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:24:38,321 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 07:24:38,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 07:24:38,516 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:24:38,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:24:38,517 INFO L85 PathProgramCache]: Analyzing trace with hash 81022672, now seen corresponding path program 36 times [2022-12-14 07:24:38,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:24:38,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883252213] [2022-12-14 07:24:38,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:24:38,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:24:39,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:25:28,704 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 168 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:25:28,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:25:28,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883252213] [2022-12-14 07:25:28,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883252213] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:25:28,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165411479] [2022-12-14 07:25:28,704 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:25:28,705 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:25:28,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:25:28,705 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:25:28,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 07:25:28,864 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:25:28,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:25:28,872 WARN L261 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 490 conjunts are in the unsatisfiable core [2022-12-14 07:25:28,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:25:29,931 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 13 treesize of output 9 [2022-12-14 07:25:43,516 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 0 proven. 945 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:25:43,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:25:54,183 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 0 proven. 840 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-12-14 07:25:54,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165411479] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:25:54,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [607981954] [2022-12-14 07:25:54,184 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:25:54,184 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:25:54,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:25:54,185 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:25:54,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:25:54,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:25:54,217 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:25:54,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:25:54,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:25:54,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:25:54,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:25:54,242 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:25:54,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:25:54,278 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:25:54,297 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:25:54,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:25:54,370 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 16 treesize of output 12 [2022-12-14 07:25:54,508 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:26:05,171 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42055#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:26:05,171 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:26:05,171 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:26:05,171 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 48, 33] total 163 [2022-12-14 07:26:05,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795781515] [2022-12-14 07:26:05,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:26:05,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-12-14 07:26:05,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:05,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-12-14 07:26:05,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1145, Invalid=26911, Unknown=0, NotChecked=0, Total=28056 [2022-12-14 07:26:05,175 INFO L87 Difference]: Start difference. First operand 140 states and 148 transitions. Second operand has 163 states, 163 states have (on average 2.184049079754601) internal successors, (356), 163 states have internal predecessors, (356), 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) [2022-12-14 07:26:38,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:38,682 INFO L93 Difference]: Finished difference Result 272 states and 300 transitions. [2022-12-14 07:26:38,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-12-14 07:26:38,682 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 2.184049079754601) internal successors, (356), 163 states have internal predecessors, (356), 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 139 [2022-12-14 07:26:38,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:38,683 INFO L225 Difference]: With dead ends: 272 [2022-12-14 07:26:38,683 INFO L226 Difference]: Without dead ends: 269 [2022-12-14 07:26:38,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 220 SyntacticMatches, 167 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34136 ImplicationChecksByTransitivity, 67.4s TimeCoverageRelationStatistics Valid=3540, Invalid=54300, Unknown=0, NotChecked=0, Total=57840 [2022-12-14 07:26:38,685 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 96 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 11829 mSolverCounterSat, 1548 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 13377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1548 IncrementalHoareTripleChecker+Valid, 11829 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:38,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 139 Invalid, 13377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1548 Valid, 11829 Invalid, 0 Unknown, 0 Unchecked, 12.3s Time] [2022-12-14 07:26:38,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2022-12-14 07:26:38,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 141. [2022-12-14 07:26:38,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0642857142857143) internal successors, (149), 140 states have internal predecessors, (149), 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) [2022-12-14 07:26:38,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 149 transitions. [2022-12-14 07:26:38,937 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 149 transitions. Word has length 139 [2022-12-14 07:26:38,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:38,937 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 149 transitions. [2022-12-14 07:26:38,937 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 2.184049079754601) internal successors, (356), 163 states have internal predecessors, (356), 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) [2022-12-14 07:26:38,937 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 149 transitions. [2022-12-14 07:26:38,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-12-14 07:26:38,938 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:38,938 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:38,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 07:26:39,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:39,139 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:39,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:39,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1783966881, now seen corresponding path program 37 times [2022-12-14 07:26:39,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:39,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776686170] [2022-12-14 07:26:39,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:39,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:39,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:39,759 INFO L134 CoverageAnalysis]: Checked inductivity of 960 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 735 trivial. 0 not checked. [2022-12-14 07:26:39,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:39,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776686170] [2022-12-14 07:26:39,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776686170] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:26:39,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745788532] [2022-12-14 07:26:39,759 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:26:39,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:39,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:39,760 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:39,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 07:26:39,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:39,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 767 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 07:26:39,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:40,235 INFO L134 CoverageAnalysis]: Checked inductivity of 960 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 735 trivial. 0 not checked. [2022-12-14 07:26:40,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:26:40,546 INFO L134 CoverageAnalysis]: Checked inductivity of 960 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 735 trivial. 0 not checked. [2022-12-14 07:26:40,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745788532] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:26:40,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1053449086] [2022-12-14 07:26:40,547 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:26:40,547 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:26:40,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:26:40,547 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:26:40,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:26:40,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:40,573 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:26:40,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:26:40,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:40,581 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:26:40,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:40,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:26:40,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:40,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:40,637 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:26:40,637 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:26:40,668 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 16 treesize of output 12 [2022-12-14 07:26:40,787 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:26:41,870 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43900#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:26:41,870 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:26:41,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:26:41,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2022-12-14 07:26:41,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920243802] [2022-12-14 07:26:41,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:26:41,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 07:26:41,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:41,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 07:26:41,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=608, Invalid=2362, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 07:26:41,872 INFO L87 Difference]: Start difference. First operand 141 states and 149 transitions. Second operand has 50 states, 50 states have (on average 1.38) internal successors, (69), 50 states have internal predecessors, (69), 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) [2022-12-14 07:26:42,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:42,895 INFO L93 Difference]: Finished difference Result 372 states and 395 transitions. [2022-12-14 07:26:42,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 07:26:42,895 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.38) internal successors, (69), 50 states have internal predecessors, (69), 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 140 [2022-12-14 07:26:42,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:42,895 INFO L225 Difference]: With dead ends: 372 [2022-12-14 07:26:42,895 INFO L226 Difference]: Without dead ends: 142 [2022-12-14 07:26:42,896 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 338 SyntacticMatches, 60 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3468 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1000, Invalid=3830, Unknown=0, NotChecked=0, Total=4830 [2022-12-14 07:26:42,896 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 1130 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 1130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:42,896 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 17 Invalid, 1343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 1130 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 07:26:42,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-12-14 07:26:43,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2022-12-14 07:26:43,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.0638297872340425) internal successors, (150), 141 states have internal predecessors, (150), 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) [2022-12-14 07:26:43,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 150 transitions. [2022-12-14 07:26:43,177 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 150 transitions. Word has length 140 [2022-12-14 07:26:43,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:43,178 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 150 transitions. [2022-12-14 07:26:43,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.38) internal successors, (69), 50 states have internal predecessors, (69), 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) [2022-12-14 07:26:43,178 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 150 transitions. [2022-12-14 07:26:43,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-12-14 07:26:43,178 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:43,178 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:43,183 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-12-14 07:26:43,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 07:26:43,379 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:43,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:43,379 INFO L85 PathProgramCache]: Analyzing trace with hash -1199827220, now seen corresponding path program 38 times [2022-12-14 07:26:43,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:43,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416559751] [2022-12-14 07:26:43,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:43,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:43,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:26:43,951 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 750 trivial. 0 not checked. [2022-12-14 07:26:43,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:26:43,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416559751] [2022-12-14 07:26:43,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416559751] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:26:43,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298785586] [2022-12-14 07:26:43,952 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 07:26:43,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:26:43,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:26:43,952 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:26:43,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 07:26:44,364 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 07:26:44,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:26:44,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 776 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 07:26:44,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:26:44,875 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 750 trivial. 0 not checked. [2022-12-14 07:26:44,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:26:45,329 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 750 trivial. 0 not checked. [2022-12-14 07:26:45,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298785586] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:26:45,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [530345242] [2022-12-14 07:26:45,330 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:26:45,330 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:26:45,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:26:45,330 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:26:45,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:26:45,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:45,356 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:26:45,356 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:26:45,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:45,378 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:26:45,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:26:45,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:45,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:26:45,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:45,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:26:45,435 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:26:45,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:26:45,468 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 16 treesize of output 12 [2022-12-14 07:26:45,585 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:26:46,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45869#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:26:46,432 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:26:46,433 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:26:46,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 79 [2022-12-14 07:26:46,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261545790] [2022-12-14 07:26:46,433 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:26:46,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-12-14 07:26:46,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:26:46,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-12-14 07:26:46,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=6109, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 07:26:46,434 INFO L87 Difference]: Start difference. First operand 142 states and 150 transitions. Second operand has 79 states, 79 states have (on average 1.3924050632911393) internal successors, (110), 79 states have internal predecessors, (110), 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) [2022-12-14 07:26:47,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:26:47,686 INFO L93 Difference]: Finished difference Result 258 states and 279 transitions. [2022-12-14 07:26:47,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 07:26:47,686 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.3924050632911393) internal successors, (110), 79 states have internal predecessors, (110), 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 141 [2022-12-14 07:26:47,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:26:47,687 INFO L225 Difference]: With dead ends: 258 [2022-12-14 07:26:47,687 INFO L226 Difference]: Without dead ends: 149 [2022-12-14 07:26:47,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 357 SyntacticMatches, 31 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4754 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1528, Invalid=8572, Unknown=0, NotChecked=0, Total=10100 [2022-12-14 07:26:47,688 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 552 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 454 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 1250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 454 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 07:26:47,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [552 Valid, 33 Invalid, 1250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [454 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 07:26:47,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-12-14 07:26:47,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2022-12-14 07:26:47,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.0608108108108107) internal successors, (157), 148 states have internal predecessors, (157), 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) [2022-12-14 07:26:47,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 157 transitions. [2022-12-14 07:26:47,962 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 157 transitions. Word has length 141 [2022-12-14 07:26:47,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:26:47,962 INFO L495 AbstractCegarLoop]: Abstraction has 149 states and 157 transitions. [2022-12-14 07:26:47,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.3924050632911393) internal successors, (110), 79 states have internal predecessors, (110), 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) [2022-12-14 07:26:47,962 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 157 transitions. [2022-12-14 07:26:47,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2022-12-14 07:26:47,963 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:26:47,963 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:26:47,969 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 07:26:48,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 07:26:48,164 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:26:48,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:26:48,164 INFO L85 PathProgramCache]: Analyzing trace with hash 294057404, now seen corresponding path program 39 times [2022-12-14 07:26:48,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:26:48,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334267905] [2022-12-14 07:26:48,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:26:48,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:26:49,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:27:44,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 177 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:27:44,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:27:44,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334267905] [2022-12-14 07:27:44,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [334267905] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:27:44,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727087891] [2022-12-14 07:27:44,846 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 07:27:44,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:27:44,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:27:44,847 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:27:44,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 07:27:45,023 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 07:27:45,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 07:27:45,033 WARN L261 TraceCheckSpWp]: Trace formula consists of 811 conjuncts, 522 conjunts are in the unsatisfiable core [2022-12-14 07:27:45,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:27:45,787 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 11 [2022-12-14 07:27:58,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 0 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 07:27:58,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:28:09,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 0 proven. 960 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-12-14 07:28:09,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727087891] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:28:09,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [33671880] [2022-12-14 07:28:09,555 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:28:09,555 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:28:09,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:28:09,556 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:28:09,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:28:09,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:28:09,579 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-12-14 07:28:09,579 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 2 case distinctions, treesize of input 26 treesize of output 42 [2022-12-14 07:28:09,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:28:09,600 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:28:09,600 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:28:09,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:28:09,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 07:28:09,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:28:09,645 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 07:28:09,658 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 07:28:09,658 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-12-14 07:28:09,701 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 16 treesize of output 12 [2022-12-14 07:28:09,824 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:28:20,729 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47780#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:28:20,729 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:28:20,729 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:28:20,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [130, 51, 35] total 173 [2022-12-14 07:28:20,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960944200] [2022-12-14 07:28:20,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:28:20,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 173 states [2022-12-14 07:28:20,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:28:20,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2022-12-14 07:28:20,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1205, Invalid=30301, Unknown=0, NotChecked=0, Total=31506 [2022-12-14 07:28:20,732 INFO L87 Difference]: Start difference. First operand 149 states and 157 transitions. Second operand has 173 states, 173 states have (on average 2.1907514450867054) internal successors, (379), 173 states have internal predecessors, (379), 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) [2022-12-14 07:29:09,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:29:09,709 INFO L93 Difference]: Finished difference Result 408 states and 447 transitions. [2022-12-14 07:29:09,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2022-12-14 07:29:09,710 INFO L78 Accepts]: Start accepts. Automaton has has 173 states, 173 states have (on average 2.1907514450867054) internal successors, (379), 173 states have internal predecessors, (379), 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 148 [2022-12-14 07:29:09,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:29:09,710 INFO L225 Difference]: With dead ends: 408 [2022-12-14 07:29:09,711 INFO L226 Difference]: Without dead ends: 405 [2022-12-14 07:29:09,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 245 SyntacticMatches, 168 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42921 ImplicationChecksByTransitivity, 77.1s TimeCoverageRelationStatistics Valid=4554, Invalid=72452, Unknown=0, NotChecked=0, Total=77006 [2022-12-14 07:29:09,713 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 90 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 14780 mSolverCounterSat, 1973 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 16753 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1973 IncrementalHoareTripleChecker+Valid, 14780 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.0s IncrementalHoareTripleChecker+Time [2022-12-14 07:29:09,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 159 Invalid, 16753 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1973 Valid, 14780 Invalid, 0 Unknown, 0 Unchecked, 17.0s Time] [2022-12-14 07:29:09,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2022-12-14 07:29:10,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 251. [2022-12-14 07:29:10,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.08) internal successors, (270), 250 states have internal predecessors, (270), 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) [2022-12-14 07:29:10,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 270 transitions. [2022-12-14 07:29:10,247 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 270 transitions. Word has length 148 [2022-12-14 07:29:10,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 07:29:10,248 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 270 transitions. [2022-12-14 07:29:10,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 173 states, 173 states have (on average 2.1907514450867054) internal successors, (379), 173 states have internal predecessors, (379), 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) [2022-12-14 07:29:10,248 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 270 transitions. [2022-12-14 07:29:10,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-12-14 07:29:10,248 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 07:29:10,248 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 07:29:10,254 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-12-14 07:29:10,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:29:10,450 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 07:29:10,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 07:29:10,450 INFO L85 PathProgramCache]: Analyzing trace with hash 525142515, now seen corresponding path program 40 times [2022-12-14 07:29:10,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 07:29:10,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426996539] [2022-12-14 07:29:10,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 07:29:10,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 07:29:10,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:29:11,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 121 proven. 135 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-12-14 07:29:11,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 07:29:11,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426996539] [2022-12-14 07:29:11,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426996539] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 07:29:11,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636848017] [2022-12-14 07:29:11,119 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 07:29:11,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 07:29:11,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 07:29:11,120 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 07:29:11,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a250b4d2-1f12-425b-bbb2-23372bacc622/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 07:29:11,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 07:29:11,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 816 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 07:29:11,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 07:29:11,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-12-14 07:29:11,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 07:29:12,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-12-14 07:29:12,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636848017] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 07:29:12,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1927070534] [2022-12-14 07:29:12,085 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-12-14 07:29:12,085 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 07:29:12,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 07:29:12,086 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 07:29:12,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 07:29:12,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:29:12,115 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-12-14 07:29:12,116 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-12-14 07:29:12,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:29:12,123 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 07:29:12,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:29:12,140 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 07:29:12,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:29:12,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 07:29:12,185 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 07:29:12,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-12-14 07:29:12,218 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 16 treesize of output 12 [2022-12-14 07:29:12,345 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 07:29:14,562 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50225#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 07:29:14,562 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 07:29:14,562 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 07:29:14,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 53 [2022-12-14 07:29:14,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031716447] [2022-12-14 07:29:14,563 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 07:29:14,563 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 07:29:14,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 07:29:14,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 07:29:14,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=679, Invalid=2627, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 07:29:14,564 INFO L87 Difference]: Start difference. First operand 251 states and 270 transitions. Second operand has 53 states, 53 states have (on average 1.3584905660377358) internal successors, (72), 53 states have internal predecessors, (72), 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) [2022-12-14 07:29:16,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 07:29:16,724 INFO L93 Difference]: Finished difference Result 597 states and 641 transitions. [2022-12-14 07:29:16,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 07:29:16,724 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.3584905660377358) internal successors, (72), 53 states have internal predecessors, (72), 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 149 [2022-12-14 07:29:16,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 07:29:16,725 INFO L225 Difference]: With dead ends: 597 [2022-12-14 07:29:16,725 INFO L226 Difference]: Without dead ends: 252 [2022-12-14 07:29:16,725 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 311 SyntacticMatches, 113 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6406 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1121, Invalid=4281, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 07:29:16,726 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 1357 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 1357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 07:29:16,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 17 Invalid, 1529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 1357 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 07:29:16,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states.