./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_3-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e04fb08f 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_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_3-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0 --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 42bdab47928922c9249a376933fe7b7a33d855d426cfe04eb271066ef5c44d0a --- 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-e04fb08 [2022-11-16 19:33:24,407 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 19:33:24,410 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 19:33:24,461 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 19:33:24,463 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 19:33:24,468 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 19:33:24,469 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 19:33:24,475 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 19:33:24,481 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 19:33:24,482 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 19:33:24,484 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 19:33:24,486 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 19:33:24,488 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 19:33:24,492 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 19:33:24,493 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 19:33:24,495 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 19:33:24,498 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 19:33:24,504 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 19:33:24,506 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 19:33:24,510 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 19:33:24,513 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 19:33:24,514 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 19:33:24,517 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 19:33:24,519 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 19:33:24,528 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 19:33:24,533 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 19:33:24,533 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 19:33:24,535 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 19:33:24,537 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 19:33:24,538 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 19:33:24,538 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 19:33:24,540 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 19:33:24,541 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 19:33:24,544 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 19:33:24,547 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 19:33:24,547 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 19:33:24,548 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 19:33:24,548 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 19:33:24,549 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 19:33:24,550 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 19:33:24,551 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 19:33:24,552 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 19:33:24,599 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 19:33:24,599 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 19:33:24,600 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 19:33:24,600 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 19:33:24,602 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 19:33:24,603 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 19:33:24,603 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 19:33:24,603 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 19:33:24,604 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 19:33:24,604 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 19:33:24,605 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 19:33:24,606 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 19:33:24,606 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 19:33:24,606 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 19:33:24,607 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 19:33:24,607 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 19:33:24,607 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 19:33:24,608 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 19:33:24,609 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 19:33:24,610 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 19:33:24,610 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 19:33:24,610 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 19:33:24,611 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 19:33:24,611 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 19:33:24,611 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 19:33:24,612 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 19:33:24,612 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 19:33:24,612 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 19:33:24,613 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 19:33:24,613 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 19:33:24,613 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 19:33:24,614 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 19:33:24,614 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 19:33:24,615 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 19:33:24,615 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 19:33:24,615 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 19:33:24,616 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 19:33:24,616 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 19:33:24,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 19:33:24,617 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 19:33:24,617 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 19:33:24,617 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_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 42bdab47928922c9249a376933fe7b7a33d855d426cfe04eb271066ef5c44d0a [2022-11-16 19:33:24,937 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 19:33:24,976 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 19:33:24,980 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 19:33:24,982 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 19:33:24,983 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 19:33:24,985 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/loop-acceleration/array_3-2.i [2022-11-16 19:33:25,067 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/data/6dac8ef88/24b1290636f045aea5a1454e52abc0f4/FLAGbc9433bcc [2022-11-16 19:33:25,650 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 19:33:25,651 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/sv-benchmarks/c/loop-acceleration/array_3-2.i [2022-11-16 19:33:25,658 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/data/6dac8ef88/24b1290636f045aea5a1454e52abc0f4/FLAGbc9433bcc [2022-11-16 19:33:26,052 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/data/6dac8ef88/24b1290636f045aea5a1454e52abc0f4 [2022-11-16 19:33:26,055 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 19:33:26,059 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 19:33:26,063 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 19:33:26,064 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 19:33:26,069 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 19:33:26,070 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,072 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24480b13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26, skipping insertion in model container [2022-11-16 19:33:26,072 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,081 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 19:33:26,099 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 19:33:26,372 WARN L229 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_c636b085-c1ea-44b9-acb7-b2f402839b47/sv-benchmarks/c/loop-acceleration/array_3-2.i[809,822] [2022-11-16 19:33:26,385 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 19:33:26,394 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 19:33:26,409 WARN L229 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_c636b085-c1ea-44b9-acb7-b2f402839b47/sv-benchmarks/c/loop-acceleration/array_3-2.i[809,822] [2022-11-16 19:33:26,414 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 19:33:26,430 INFO L208 MainTranslator]: Completed translation [2022-11-16 19:33:26,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26 WrapperNode [2022-11-16 19:33:26,431 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 19:33:26,433 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 19:33:26,433 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 19:33:26,433 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 19:33:26,441 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,449 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,475 INFO L138 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 47 [2022-11-16 19:33:26,475 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 19:33:26,477 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 19:33:26,477 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 19:33:26,477 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 19:33:26,488 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,489 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,507 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,508 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,512 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,518 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,519 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,519 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,521 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 19:33:26,522 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 19:33:26,523 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 19:33:26,523 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 19:33:26,524 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (1/1) ... [2022-11-16 19:33:26,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 19:33:26,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:26,557 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 19:33:26,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 19:33:26,599 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 19:33:26,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 19:33:26,600 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-16 19:33:26,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-16 19:33:26,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 19:33:26,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 19:33:26,601 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-16 19:33:26,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-16 19:33:26,683 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 19:33:26,685 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 19:33:26,836 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 19:33:26,891 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 19:33:26,892 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-16 19:33:26,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:33:26 BoogieIcfgContainer [2022-11-16 19:33:26,895 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 19:33:26,898 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 19:33:26,899 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 19:33:26,906 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 19:33:26,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 07:33:26" (1/3) ... [2022-11-16 19:33:26,907 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1071b39f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 07:33:26, skipping insertion in model container [2022-11-16 19:33:26,907 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:33:26" (2/3) ... [2022-11-16 19:33:26,908 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1071b39f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 07:33:26, skipping insertion in model container [2022-11-16 19:33:26,908 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:33:26" (3/3) ... [2022-11-16 19:33:26,910 INFO L112 eAbstractionObserver]: Analyzing ICFG array_3-2.i [2022-11-16 19:33:26,958 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 19:33:26,958 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-16 19:33:27,088 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 19:33:27,096 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;@64638002, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 19:33:27,097 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-16 19:33:27,130 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:27,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-16 19:33:27,138 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:27,138 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-16 19:33:27,139 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:27,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:27,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1804998677, now seen corresponding path program 1 times [2022-11-16 19:33:27,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:27,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216880698] [2022-11-16 19:33:27,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:27,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:27,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:27,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:33:27,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:27,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216880698] [2022-11-16 19:33:27,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216880698] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:33:27,356 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:33:27,357 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 19:33:27,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526512602] [2022-11-16 19:33:27,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:33:27,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-16 19:33:27,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:27,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-16 19:33:27,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-16 19:33:27,401 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 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) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:27,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:27,434 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-16 19:33:27,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-16 19:33:27,437 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 6 [2022-11-16 19:33:27,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:27,446 INFO L225 Difference]: With dead ends: 16 [2022-11-16 19:33:27,446 INFO L226 Difference]: Without dead ends: 8 [2022-11-16 19:33:27,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-16 19:33:27,453 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:27,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:33:27,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2022-11-16 19:33:27,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2022-11-16 19:33:27,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:27,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2022-11-16 19:33:27,493 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2022-11-16 19:33:27,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:27,494 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2022-11-16 19:33:27,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:27,495 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2022-11-16 19:33:27,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-16 19:33:27,495 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:27,496 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:27,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 19:33:27,497 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:27,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:27,498 INFO L85 PathProgramCache]: Analyzing trace with hash -99384387, now seen corresponding path program 1 times [2022-11-16 19:33:27,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:27,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055018214] [2022-11-16 19:33:27,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:27,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:27,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:27,595 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:33:27,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:27,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055018214] [2022-11-16 19:33:27,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055018214] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:33:27,597 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:33:27,597 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 19:33:27,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999128581] [2022-11-16 19:33:27,598 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:33:27,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 19:33:27,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:27,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 19:33:27,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:33:27,603 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:27,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:27,632 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2022-11-16 19:33:27,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 19:33:27,633 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-16 19:33:27,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:27,634 INFO L225 Difference]: With dead ends: 21 [2022-11-16 19:33:27,634 INFO L226 Difference]: Without dead ends: 15 [2022-11-16 19:33:27,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:33:27,636 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:27,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 6 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:33:27,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-16 19:33:27,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 9. [2022-11-16 19:33:27,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:27,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2022-11-16 19:33:27,643 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2022-11-16 19:33:27,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:27,643 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2022-11-16 19:33:27,644 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:27,644 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2022-11-16 19:33:27,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-16 19:33:27,645 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:27,645 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:27,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-16 19:33:27,646 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:27,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:27,647 INFO L85 PathProgramCache]: Analyzing trace with hash -1507211673, now seen corresponding path program 1 times [2022-11-16 19:33:27,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:27,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138546393] [2022-11-16 19:33:27,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:27,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:27,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:27,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:33:27,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:27,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138546393] [2022-11-16 19:33:27,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138546393] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:33:27,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755942310] [2022-11-16 19:33:27,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:27,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:27,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:27,775 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:33:27,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 19:33:27,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:27,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-16 19:33:27,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:33:27,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:33:27,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:33:28,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:33:28,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755942310] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:33:28,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [695604644] [2022-11-16 19:33:28,061 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:33:28,061 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:33:28,069 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:33:28,076 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:33:28,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:33:28,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:28,262 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:33:28,264 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:33:28,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:28,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 19:33:28,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:28,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-16 19:33:28,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:28,589 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 19:33:28,631 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-16 19:33:28,632 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 186 treesize of output 185 [2022-11-16 19:33:28,843 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 [2022-11-16 19:33:28,932 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:33:29,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [695604644] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:33:29,146 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:33:29,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2022-11-16 19:33:29,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559305968] [2022-11-16 19:33:29,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:33:29,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-16 19:33:29,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:29,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-16 19:33:29,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2022-11-16 19:33:29,153 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:29,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:29,227 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2022-11-16 19:33:29,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-16 19:33:29,229 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-16 19:33:29,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:29,230 INFO L225 Difference]: With dead ends: 15 [2022-11-16 19:33:29,232 INFO L226 Difference]: Without dead ends: 11 [2022-11-16 19:33:29,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2022-11-16 19:33:29,238 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:29,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 5 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:33:29,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-11-16 19:33:29,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-11-16 19:33:29,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:29,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-11-16 19:33:29,256 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2022-11-16 19:33:29,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:29,256 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-11-16 19:33:29,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:29,257 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-11-16 19:33:29,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-16 19:33:29,258 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:29,258 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:29,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 19:33:29,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:29,464 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:29,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:29,465 INFO L85 PathProgramCache]: Analyzing trace with hash -320276660, now seen corresponding path program 1 times [2022-11-16 19:33:29,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:29,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833308520] [2022-11-16 19:33:29,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:29,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:29,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:29,548 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 19:33:29,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:29,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833308520] [2022-11-16 19:33:29,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833308520] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:33:29,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104300922] [2022-11-16 19:33:29,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:29,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:29,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:29,551 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:33:29,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 19:33:29,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:29,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-16 19:33:29,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:33:29,636 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 19:33:29,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:33:29,659 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 19:33:29,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104300922] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:33:29,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [94442979] [2022-11-16 19:33:29,662 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:33:29,663 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:33:29,663 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:33:29,663 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:33:29,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:33:29,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:29,704 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:33:29,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:33:29,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:29,725 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 19:33:29,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:29,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-16 19:33:29,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:29,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:29,888 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-16 19:33:29,889 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 196 treesize of output 184 [2022-11-16 19:33:29,945 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 [2022-11-16 19:33:30,165 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:33:30,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '235#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:33:30,289 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:33:30,289 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:33:30,289 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-16 19:33:30,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289837242] [2022-11-16 19:33:30,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:33:30,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-16 19:33:30,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:30,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-16 19:33:30,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-16 19:33:30,292 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:30,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:30,342 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-11-16 19:33:30,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-16 19:33:30,343 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 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 10 [2022-11-16 19:33:30,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:30,344 INFO L225 Difference]: With dead ends: 40 [2022-11-16 19:33:30,344 INFO L226 Difference]: Without dead ends: 32 [2022-11-16 19:33:30,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-16 19:33:30,345 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:30,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 15 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:33:30,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-16 19:33:30,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 14. [2022-11-16 19:33:30,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:30,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-16 19:33:30,353 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2022-11-16 19:33:30,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:30,353 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-16 19:33:30,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:30,354 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-16 19:33:30,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-16 19:33:30,354 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:30,355 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:30,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-16 19:33:30,560 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:30,561 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:30,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:30,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1870426530, now seen corresponding path program 2 times [2022-11-16 19:33:30,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:30,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518659187] [2022-11-16 19:33:30,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:30,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:30,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:30,724 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:33:30,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:30,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518659187] [2022-11-16 19:33:30,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518659187] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:33:30,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868086046] [2022-11-16 19:33:30,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:33:30,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:30,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:30,727 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:33:30,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 19:33:30,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-16 19:33:30,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:33:30,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 19:33:30,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:33:30,844 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:33:30,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:33:30,880 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:33:30,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868086046] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:33:30,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405452393] [2022-11-16 19:33:30,886 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:33:30,886 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:33:30,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:33:30,887 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:33:30,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:33:30,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:30,941 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:33:30,942 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:33:30,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:30,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 19:33:30,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:30,985 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-16 19:33:31,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:31,060 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 19:33:31,091 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-16 19:33:31,092 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 186 treesize of output 185 [2022-11-16 19:33:31,190 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 [2022-11-16 19:33:31,316 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:33:31,495 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '392#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:33:31,495 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:33:31,496 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:33:31,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2022-11-16 19:33:31,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524911165] [2022-11-16 19:33:31,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:33:31,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-16 19:33:31,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:31,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-16 19:33:31,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2022-11-16 19:33:31,498 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:31,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:31,603 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2022-11-16 19:33:31,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-16 19:33:31,604 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-16 19:33:31,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:31,606 INFO L225 Difference]: With dead ends: 28 [2022-11-16 19:33:31,606 INFO L226 Difference]: Without dead ends: 20 [2022-11-16 19:33:31,607 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2022-11-16 19:33:31,608 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:31,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 19 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:33:31,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-16 19:33:31,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-16 19:33:31,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:31,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-16 19:33:31,618 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2022-11-16 19:33:31,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:31,618 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-16 19:33:31,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:31,619 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-16 19:33:31,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-16 19:33:31,620 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:31,620 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:31,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 19:33:31,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:31,826 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:31,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:31,827 INFO L85 PathProgramCache]: Analyzing trace with hash -11023279, now seen corresponding path program 3 times [2022-11-16 19:33:31,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:31,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686611584] [2022-11-16 19:33:31,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:31,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:31,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:32,048 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-16 19:33:32,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:32,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686611584] [2022-11-16 19:33:32,049 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [686611584] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:33:32,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861483937] [2022-11-16 19:33:32,049 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:33:32,049 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:32,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:32,051 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:33:32,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 19:33:32,125 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:33:32,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:33:32,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-16 19:33:32,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:33:32,147 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-16 19:33:32,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:33:32,211 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-16 19:33:32,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861483937] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:33:32,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [371053454] [2022-11-16 19:33:32,213 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:33:32,214 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:33:32,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:33:32,214 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:33:32,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:33:32,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:32,252 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:33:32,252 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:33:32,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:32,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 19:33:32,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:32,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-16 19:33:32,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:32,355 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 19:33:32,384 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-16 19:33:32,385 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 186 treesize of output 185 [2022-11-16 19:33:32,504 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 [2022-11-16 19:33:32,650 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:33:32,856 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '590#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:33:32,856 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:33:32,856 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:33:32,856 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-16 19:33:32,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255511918] [2022-11-16 19:33:32,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:33:32,857 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-16 19:33:32,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:32,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-16 19:33:32,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-11-16 19:33:32,858 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:32,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:32,957 INFO L93 Difference]: Finished difference Result 76 states and 83 transitions. [2022-11-16 19:33:32,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-16 19:33:32,958 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-16 19:33:32,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:32,959 INFO L225 Difference]: With dead ends: 76 [2022-11-16 19:33:32,959 INFO L226 Difference]: Without dead ends: 62 [2022-11-16 19:33:32,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-11-16 19:33:32,960 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:32,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 24 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:33:32,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-16 19:33:32,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 26. [2022-11-16 19:33:32,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:32,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-11-16 19:33:32,970 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19 [2022-11-16 19:33:32,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:32,971 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-11-16 19:33:32,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:32,971 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-11-16 19:33:32,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-16 19:33:32,972 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:32,972 INFO L195 NwaCegarLoop]: trace histogram [10, 5, 4, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:32,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 19:33:33,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-16 19:33:33,178 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:33,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:33,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1846920175, now seen corresponding path program 4 times [2022-11-16 19:33:33,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:33,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349625074] [2022-11-16 19:33:33,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:33,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:33,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:33,457 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-16 19:33:33,457 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:33,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349625074] [2022-11-16 19:33:33,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349625074] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:33:33,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [32219242] [2022-11-16 19:33:33,458 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:33:33,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:33,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:33,459 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:33:33,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 19:33:33,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:33,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-16 19:33:33,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:33:33,622 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-16 19:33:33,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:33:33,897 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-16 19:33:33,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [32219242] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:33:33,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254304328] [2022-11-16 19:33:33,899 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:33:33,899 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:33:33,900 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:33:33,900 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:33:33,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:33:33,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:33,933 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-16 19:33:33,934 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-16 19:33:33,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:33,967 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:33:33,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:33:33,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:33,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-16 19:33:34,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:34,054 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 19:33:34,084 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-16 19:33:34,085 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 186 treesize of output 185 [2022-11-16 19:33:34,181 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 [2022-11-16 19:33:34,327 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:33:34,590 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '907#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:33:34,590 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:33:34,590 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:33:34,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-16 19:33:34,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568662601] [2022-11-16 19:33:34,591 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:33:34,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-16 19:33:34,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:34,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-16 19:33:34,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-11-16 19:33:34,593 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:34,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:34,868 INFO L93 Difference]: Finished difference Result 160 states and 173 transitions. [2022-11-16 19:33:34,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-16 19:33:34,871 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 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) Word has length 25 [2022-11-16 19:33:34,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:34,875 INFO L225 Difference]: With dead ends: 160 [2022-11-16 19:33:34,876 INFO L226 Difference]: Without dead ends: 146 [2022-11-16 19:33:34,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-11-16 19:33:34,878 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 219 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:34,878 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 66 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 19:33:34,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-16 19:33:34,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 38. [2022-11-16 19:33:34,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:34,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2022-11-16 19:33:34,908 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 25 [2022-11-16 19:33:34,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:34,908 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2022-11-16 19:33:34,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:34,909 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2022-11-16 19:33:34,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-16 19:33:34,910 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:34,910 INFO L195 NwaCegarLoop]: trace histogram [22, 5, 4, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:34,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-16 19:33:35,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:35,117 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:35,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:35,117 INFO L85 PathProgramCache]: Analyzing trace with hash -385700975, now seen corresponding path program 5 times [2022-11-16 19:33:35,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:35,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133154358] [2022-11-16 19:33:35,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:35,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:35,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:35,892 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-16 19:33:35,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:35,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133154358] [2022-11-16 19:33:35,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133154358] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:33:35,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451728194] [2022-11-16 19:33:35,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:33:35,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:35,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:35,900 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:33:35,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 19:33:36,027 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-16 19:33:36,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:33:36,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-16 19:33:36,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:33:36,083 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-16 19:33:36,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:33:36,285 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-16 19:33:36,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1451728194] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:33:36,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [616092175] [2022-11-16 19:33:36,288 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:33:36,288 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:33:36,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:33:36,288 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:33:36,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:33:36,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:36,328 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:33:36,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:33:36,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:36,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 19:33:36,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:36,364 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-16 19:33:36,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:36,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:36,432 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-16 19:33:36,433 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 196 treesize of output 184 [2022-11-16 19:33:36,478 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 [2022-11-16 19:33:36,548 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:33:36,856 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1436#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:33:36,857 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:33:36,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:33:36,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 33 [2022-11-16 19:33:36,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337406552] [2022-11-16 19:33:36,857 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:33:36,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-16 19:33:36,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:36,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-16 19:33:36,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=781, Unknown=0, NotChecked=0, Total=1260 [2022-11-16 19:33:36,859 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 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) [2022-11-16 19:33:37,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:37,778 INFO L93 Difference]: Finished difference Result 154 states and 185 transitions. [2022-11-16 19:33:37,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-16 19:33:37,779 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 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) Word has length 37 [2022-11-16 19:33:37,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:37,779 INFO L225 Difference]: With dead ends: 154 [2022-11-16 19:33:37,779 INFO L226 Difference]: Without dead ends: 92 [2022-11-16 19:33:37,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1151, Invalid=2389, Unknown=0, NotChecked=0, Total=3540 [2022-11-16 19:33:37,782 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 213 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:37,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 36 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 19:33:37,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-16 19:33:37,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2022-11-16 19:33:37,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:37,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-11-16 19:33:37,820 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 37 [2022-11-16 19:33:37,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:37,821 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-11-16 19:33:37,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 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) [2022-11-16 19:33:37,821 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-11-16 19:33:37,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-16 19:33:37,825 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:37,826 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:37,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-16 19:33:38,031 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:38,032 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:38,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:38,032 INFO L85 PathProgramCache]: Analyzing trace with hash -1548067895, now seen corresponding path program 6 times [2022-11-16 19:33:38,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:38,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151281803] [2022-11-16 19:33:38,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:38,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:38,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:39,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-16 19:33:39,628 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:39,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151281803] [2022-11-16 19:33:39,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151281803] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:33:39,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742218026] [2022-11-16 19:33:39,629 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:33:39,629 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:39,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:39,631 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:33:39,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-16 19:33:39,829 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:33:39,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:33:39,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-16 19:33:39,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:33:39,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-16 19:33:39,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:33:41,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-16 19:33:41,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742218026] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:33:41,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [765553659] [2022-11-16 19:33:41,264 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:33:41,265 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:33:41,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:33:41,265 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:33:41,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:33:41,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:41,303 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:33:41,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:33:41,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:41,316 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 19:33:41,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:41,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-16 19:33:41,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:41,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:41,400 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-16 19:33:41,400 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 196 treesize of output 184 [2022-11-16 19:33:41,475 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 [2022-11-16 19:33:41,540 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:33:42,784 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2455#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:33:42,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:33:42,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:33:42,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2022-11-16 19:33:42,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998038059] [2022-11-16 19:33:42,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:33:42,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-16 19:33:42,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:42,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-16 19:33:42,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1839, Invalid=2193, Unknown=0, NotChecked=0, Total=4032 [2022-11-16 19:33:42,788 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 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) [2022-11-16 19:33:43,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:43,597 INFO L93 Difference]: Finished difference Result 364 states and 395 transitions. [2022-11-16 19:33:43,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-16 19:33:43,598 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 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) Word has length 91 [2022-11-16 19:33:43,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:43,600 INFO L225 Difference]: With dead ends: 364 [2022-11-16 19:33:43,600 INFO L226 Difference]: Without dead ends: 302 [2022-11-16 19:33:43,602 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 210 SyntacticMatches, 29 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2896 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1839, Invalid=2193, Unknown=0, NotChecked=0, Total=4032 [2022-11-16 19:33:43,603 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 514 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 514 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:43,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [514 Valid, 111 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 19:33:43,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-11-16 19:33:43,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 122. [2022-11-16 19:33:43,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 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) [2022-11-16 19:33:43,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2022-11-16 19:33:43,637 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 91 [2022-11-16 19:33:43,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:43,638 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2022-11-16 19:33:43,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 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) [2022-11-16 19:33:43,638 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2022-11-16 19:33:43,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-16 19:33:43,640 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:43,640 INFO L195 NwaCegarLoop]: trace histogram [58, 29, 28, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:43,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-16 19:33:43,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:43,847 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:43,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:43,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1453217143, now seen corresponding path program 7 times [2022-11-16 19:33:43,848 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:43,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462132412] [2022-11-16 19:33:43,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:43,848 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:33:43,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:47,691 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-16 19:33:47,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:33:47,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462132412] [2022-11-16 19:33:47,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462132412] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:33:47,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917340949] [2022-11-16 19:33:47,692 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:33:47,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:33:47,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:33:47,694 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:33:47,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-16 19:33:47,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:33:47,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 710 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-16 19:33:47,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:33:48,078 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-16 19:33:48,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:33:52,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-16 19:33:52,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917340949] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:33:52,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [871637527] [2022-11-16 19:33:52,962 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:33:52,962 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:33:52,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:33:52,963 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:33:52,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:33:52,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:52,991 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-16 19:33:52,992 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-16 19:33:53,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:53,016 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:33:53,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:33:53,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:53,037 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-16 19:33:53,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:33:53,093 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 19:33:53,120 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-16 19:33:53,120 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 186 treesize of output 185 [2022-11-16 19:33:53,208 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 [2022-11-16 19:33:53,341 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:33:55,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4020#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:33:55,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:33:55,560 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:33:55,560 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 120 [2022-11-16 19:33:55,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552187186] [2022-11-16 19:33:55,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:33:55,561 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-11-16 19:33:55,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:33:55,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-11-16 19:33:55,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7269, Invalid=7983, Unknown=0, NotChecked=0, Total=15252 [2022-11-16 19:33:55,570 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:59,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:33:59,514 INFO L93 Difference]: Finished difference Result 784 states and 845 transitions. [2022-11-16 19:33:59,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-11-16 19:33:59,516 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 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 [2022-11-16 19:33:59,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:33:59,519 INFO L225 Difference]: With dead ends: 784 [2022-11-16 19:33:59,519 INFO L226 Difference]: Without dead ends: 722 [2022-11-16 19:33:59,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 270 SyntacticMatches, 29 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5896 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=7269, Invalid=7983, Unknown=0, NotChecked=0, Total=15252 [2022-11-16 19:33:59,525 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2261 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 646 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2261 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 1104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 646 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:33:59,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2261 Valid, 288 Invalid, 1104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [646 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-16 19:33:59,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2022-11-16 19:33:59,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 182. [2022-11-16 19:33:59,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.011049723756906) internal successors, (183), 181 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:59,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2022-11-16 19:33:59,576 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 121 [2022-11-16 19:33:59,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:33:59,577 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2022-11-16 19:33:59,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:33:59,578 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2022-11-16 19:33:59,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2022-11-16 19:33:59,580 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:33:59,581 INFO L195 NwaCegarLoop]: trace histogram [118, 29, 28, 1, 1, 1, 1, 1, 1] [2022-11-16 19:33:59,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-16 19:33:59,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-16 19:33:59,789 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:33:59,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:33:59,789 INFO L85 PathProgramCache]: Analyzing trace with hash 346642441, now seen corresponding path program 8 times [2022-11-16 19:33:59,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:33:59,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278168244] [2022-11-16 19:33:59,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:33:59,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:34:00,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:34:12,163 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7021 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-16 19:34:12,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:34:12,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278168244] [2022-11-16 19:34:12,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278168244] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:34:12,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169760399] [2022-11-16 19:34:12,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:34:12,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:34:12,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:34:12,165 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:34:12,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-16 19:39:37,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-11-16 19:39:37,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:39:37,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 692 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 19:39:37,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:39:38,014 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 7021 trivial. 0 not checked. [2022-11-16 19:39:38,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:39:42,080 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 7021 trivial. 0 not checked. [2022-11-16 19:39:42,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169760399] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:39:42,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [906108323] [2022-11-16 19:39:42,083 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:39:42,083 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:39:42,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:39:42,083 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:39:42,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:39:42,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:39:42,120 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:39:42,120 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:39:42,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:39:42,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 19:39:42,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:39:42,153 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-16 19:39:42,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:39:42,204 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 19:39:42,231 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-16 19:39:42,232 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 186 treesize of output 185 [2022-11-16 19:39:42,323 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 [2022-11-16 19:39:42,496 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:39:46,898 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6637#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:39:46,898 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:39:46,899 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:39:46,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 32, 32] total 153 [2022-11-16 19:39:46,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628304525] [2022-11-16 19:39:46,899 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:39:46,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2022-11-16 19:39:46,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:39:46,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2022-11-16 19:39:46,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11339, Invalid=12841, Unknown=0, NotChecked=0, Total=24180 [2022-11-16 19:39:46,909 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:04,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:40:04,726 INFO L93 Difference]: Finished difference Result 754 states and 905 transitions. [2022-11-16 19:40:04,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 270 states. [2022-11-16 19:40:04,727 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 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 181 [2022-11-16 19:40:04,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:40:04,731 INFO L225 Difference]: With dead ends: 754 [2022-11-16 19:40:04,731 INFO L226 Difference]: Without dead ends: 452 [2022-11-16 19:40:04,743 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 478 SyntacticMatches, 29 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14015 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=26219, Invalid=49681, Unknown=0, NotChecked=0, Total=75900 [2022-11-16 19:40:04,744 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1236 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 1018 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1236 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1018 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-16 19:40:04,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1236 Valid, 143 Invalid, 1601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1018 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-16 19:40:04,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2022-11-16 19:40:05,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 452. [2022-11-16 19:40:05,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 1.0044345898004434) internal successors, (453), 451 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:05,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 453 transitions. [2022-11-16 19:40:05,249 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 453 transitions. Word has length 181 [2022-11-16 19:40:05,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:40:05,250 INFO L495 AbstractCegarLoop]: Abstraction has 452 states and 453 transitions. [2022-11-16 19:40:05,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:05,251 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 453 transitions. [2022-11-16 19:40:05,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 452 [2022-11-16 19:40:05,264 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:40:05,264 INFO L195 NwaCegarLoop]: trace histogram [149, 148, 148, 1, 1, 1, 1, 1, 1] [2022-11-16 19:40:05,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-16 19:40:05,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-16 19:40:05,480 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:40:05,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:40:05,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1051002591, now seen corresponding path program 9 times [2022-11-16 19:40:05,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:40:05,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200432901] [2022-11-16 19:40:05,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:05,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:40:05,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:29,024 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-16 19:40:29,025 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:40:29,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200432901] [2022-11-16 19:40:29,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200432901] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:40:29,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699199222] [2022-11-16 19:40:29,026 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:40:29,026 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:29,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:40:29,028 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:40:29,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-16 19:40:29,839 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:40:29,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:40:29,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 2120 conjuncts, 150 conjunts are in the unsatisfiable core [2022-11-16 19:40:29,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:40:30,289 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-16 19:40:30,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:41:03,971 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-16 19:41:03,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699199222] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:41:03,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1408601846] [2022-11-16 19:41:03,974 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:41:03,975 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:41:03,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:41:03,975 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:41:03,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:41:03,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:41:04,012 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-16 19:41:04,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-16 19:41:04,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:41:04,039 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:41:04,040 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:41:04,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:41:04,064 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-16 19:41:04,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:41:04,110 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 19:41:04,137 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-16 19:41:04,137 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 186 treesize of output 185 [2022-11-16 19:41:04,210 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 [2022-11-16 19:41:04,288 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:41:29,542 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11712#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:41:29,542 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:41:29,542 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:41:29,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [150, 150, 150] total 300 [2022-11-16 19:41:29,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407860077] [2022-11-16 19:41:29,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:41:29,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 301 states [2022-11-16 19:41:29,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:41:29,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 301 interpolants. [2022-11-16 19:41:29,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45159, Invalid=46953, Unknown=0, NotChecked=0, Total=92112 [2022-11-16 19:41:29,569 INFO L87 Difference]: Start difference. First operand 452 states and 453 transitions. Second operand has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:42:42,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:42:42,295 INFO L93 Difference]: Finished difference Result 1804 states and 1955 transitions. [2022-11-16 19:42:42,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 300 states. [2022-11-16 19:42:42,296 INFO L78 Accepts]: Start accepts. Automaton has has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 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 451 [2022-11-16 19:42:42,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:42:42,303 INFO L225 Difference]: With dead ends: 1804 [2022-11-16 19:42:42,303 INFO L226 Difference]: Without dead ends: 1502 [2022-11-16 19:42:42,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1501 GetRequests, 1050 SyntacticMatches, 149 SemanticMatches, 302 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68536 ImplicationChecksByTransitivity, 69.5s TimeCoverageRelationStatistics Valid=45159, Invalid=46953, Unknown=0, NotChecked=0, Total=92112 [2022-11-16 19:42:42,312 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4664 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 1058 mSolverCounterSat, 1810 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4664 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 2868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1810 IncrementalHoareTripleChecker+Valid, 1058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-16 19:42:42,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4664 Valid, 468 Invalid, 2868 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1810 Valid, 1058 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-16 19:42:42,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1502 states. [2022-11-16 19:42:42,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1502 to 602. [2022-11-16 19:42:42,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 601 states have (on average 1.0033277870216306) internal successors, (603), 601 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:42:42,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 603 transitions. [2022-11-16 19:42:42,821 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 603 transitions. Word has length 451 [2022-11-16 19:42:42,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:42:42,822 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 603 transitions. [2022-11-16 19:42:42,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:42:42,823 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 603 transitions. [2022-11-16 19:42:42,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 602 [2022-11-16 19:42:42,843 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:42:42,843 INFO L195 NwaCegarLoop]: trace histogram [298, 149, 148, 1, 1, 1, 1, 1, 1] [2022-11-16 19:42:42,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-16 19:42:43,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:42:43,055 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:42:43,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:42:43,056 INFO L85 PathProgramCache]: Analyzing trace with hash -281697567, now seen corresponding path program 10 times [2022-11-16 19:42:43,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:42:43,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146509945] [2022-11-16 19:42:43,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:43,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:42:44,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:44:07,402 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-16 19:44:07,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:44:07,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146509945] [2022-11-16 19:44:07,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146509945] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:44:07,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859584974] [2022-11-16 19:44:07,404 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:44:07,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:44:07,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:44:07,411 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:44:07,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c636b085-c1ea-44b9-acb7-b2f402839b47/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-16 19:44:08,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:44:08,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 3470 conjuncts, 300 conjunts are in the unsatisfiable core [2022-11-16 19:44:08,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:44:09,419 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-16 19:44:09,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:46:20,261 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-16 19:46:20,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859584974] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:46:20,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2142504789] [2022-11-16 19:46:20,263 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 19:46:20,264 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:46:20,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:46:20,264 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:46:20,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:46:20,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:46:20,294 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 19:46:20,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 19:46:20,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:46:20,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 19:46:20,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:46:20,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-16 19:46:20,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:46:20,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 19:46:20,396 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-16 19:46:20,397 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 196 treesize of output 184 [2022-11-16 19:46:20,444 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 [2022-11-16 19:46:20,504 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:47:09,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19517#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#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) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 19:47:09,631 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:47:09,631 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:47:09,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [300, 300, 300] total 600 [2022-11-16 19:47:09,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859488312] [2022-11-16 19:47:09,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:47:09,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 601 states [2022-11-16 19:47:09,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:47:09,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 601 interpolants. [2022-11-16 19:47:09,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180309, Invalid=183903, Unknown=0, NotChecked=0, Total=364212 [2022-11-16 19:47:09,689 INFO L87 Difference]: Start difference. First operand 602 states and 603 transitions. Second operand has 601 states, 601 states have (on average 1.0116472545757071) internal successors, (608), 600 states have internal predecessors, (608), 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)