./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a 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_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI --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 03931b69e9073178e54f20b91a2b2a66154a89c69758aa4d312927278c5c0104 --- 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-5e519f3 [2022-11-03 02:21:54,210 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:21:54,213 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:21:54,266 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:21:54,266 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:21:54,271 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:21:54,273 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:21:54,276 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:21:54,280 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:21:54,286 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:21:54,287 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:21:54,289 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:21:54,290 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:21:54,292 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:21:54,294 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:21:54,296 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:21:54,298 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:21:54,299 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:21:54,300 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:21:54,308 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:21:54,309 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:21:54,310 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:21:54,314 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:21:54,315 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:21:54,324 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:21:54,325 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:21:54,325 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:21:54,327 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:21:54,328 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:21:54,329 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:21:54,329 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:21:54,330 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:21:54,332 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:21:54,334 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:21:54,335 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:21:54,335 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:21:54,336 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:21:54,336 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:21:54,336 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:21:54,337 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:21:54,338 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:21:54,339 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:21:54,380 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:21:54,380 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:21:54,381 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:21:54,381 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:21:54,382 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:21:54,382 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:21:54,382 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:21:54,382 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:21:54,382 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:21:54,383 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:21:54,384 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:21:54,384 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:21:54,384 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:21:54,384 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:21:54,384 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:21:54,385 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:21:54,385 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:21:54,385 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:21:54,386 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:21:54,386 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:21:54,386 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:21:54,386 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:21:54,387 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:21:54,387 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:21:54,387 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:21:54,387 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:21:54,387 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:21:54,388 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:21:54,388 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:21:54,388 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:21:54,388 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:21:54,389 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:21:54,389 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:21:54,389 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:21:54,389 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:21:54,390 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:21:54,390 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:21:54,390 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:21:54,390 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:21:54,390 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:21:54,391 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:21:54,391 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_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 03931b69e9073178e54f20b91a2b2a66154a89c69758aa4d312927278c5c0104 [2022-11-03 02:21:54,672 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:21:54,712 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:21:54,714 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:21:54,715 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:21:54,716 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:21:54,717 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2022-11-03 02:21:54,791 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/data/67148a951/2adb97aa9bab46558082f6199c9de74d/FLAG1db8ee5a9 [2022-11-03 02:21:55,213 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:21:55,214 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2022-11-03 02:21:55,220 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/data/67148a951/2adb97aa9bab46558082f6199c9de74d/FLAG1db8ee5a9 [2022-11-03 02:21:55,650 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/data/67148a951/2adb97aa9bab46558082f6199c9de74d [2022-11-03 02:21:55,654 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:21:55,656 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:21:55,661 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:21:55,661 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:21:55,664 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:21:55,665 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,667 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f2f73f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55, skipping insertion in model container [2022-11-03 02:21:55,667 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,674 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:21:55,689 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:21:55,859 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2022-11-03 02:21:55,871 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:21:55,879 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:21:55,891 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2022-11-03 02:21:55,897 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:21:55,911 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:21:55,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55 WrapperNode [2022-11-03 02:21:55,911 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:21:55,913 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:21:55,913 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:21:55,913 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:21:55,921 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,929 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,945 INFO L138 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2022-11-03 02:21:55,946 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:21:55,946 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:21:55,947 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:21:55,947 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:21:55,954 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,954 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,955 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,956 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,960 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,964 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,965 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,966 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,968 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:21:55,969 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:21:55,969 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:21:55,969 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:21:55,970 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (1/1) ... [2022-11-03 02:21:55,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:21:55,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:21:56,004 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:21:56,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:21:56,045 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:21:56,046 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:21:56,046 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-03 02:21:56,046 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-03 02:21:56,046 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:21:56,046 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:21:56,047 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-03 02:21:56,047 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-03 02:21:56,119 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:21:56,121 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:21:56,306 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:21:56,330 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:21:56,330 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-03 02:21:56,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:21:56 BoogieIcfgContainer [2022-11-03 02:21:56,333 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:21:56,336 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:21:56,336 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:21:56,339 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:21:56,340 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:21:55" (1/3) ... [2022-11-03 02:21:56,341 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@499950bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:21:56, skipping insertion in model container [2022-11-03 02:21:56,341 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:21:55" (2/3) ... [2022-11-03 02:21:56,341 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@499950bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:21:56, skipping insertion in model container [2022-11-03 02:21:56,341 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:21:56" (3/3) ... [2022-11-03 02:21:56,343 INFO L112 eAbstractionObserver]: Analyzing ICFG array_shadowinit.i [2022-11-03 02:21:56,362 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:21:56,362 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:21:56,437 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:21:56,450 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;@61c35927, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:21:56,451 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:21:56,458 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) [2022-11-03 02:21:56,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 02:21:56,466 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:21:56,468 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 02:21:56,469 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:21:56,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:21:56,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1969782628, now seen corresponding path program 1 times [2022-11-03 02:21:56,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:21:56,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705934550] [2022-11-03 02:21:56,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:21:56,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:21:56,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:21:56,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:21:56,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:21:56,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705934550] [2022-11-03 02:21:56,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705934550] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:21:56,811 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:21:56,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:21:56,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523062686] [2022-11-03 02:21:56,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:21:56,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:21:56,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:21:56,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:21:56,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:21:56,877 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 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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) [2022-11-03 02:21:56,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:21:56,962 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2022-11-03 02:21:56,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:21:56,965 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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 [2022-11-03 02:21:56,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:21:56,972 INFO L225 Difference]: With dead ends: 18 [2022-11-03 02:21:56,977 INFO L226 Difference]: Without dead ends: 9 [2022-11-03 02:21:56,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:21:56,986 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:21:56,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:21:57,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-03 02:21:57,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-11-03 02:21:57,024 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) [2022-11-03 02:21:57,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2022-11-03 02:21:57,026 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2022-11-03 02:21:57,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:21:57,027 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2022-11-03 02:21:57,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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) [2022-11-03 02:21:57,027 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2022-11-03 02:21:57,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-03 02:21:57,028 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:21:57,028 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:21:57,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 02:21:57,028 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:21:57,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:21:57,029 INFO L85 PathProgramCache]: Analyzing trace with hash -968964990, now seen corresponding path program 1 times [2022-11-03 02:21:57,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:21:57,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426639696] [2022-11-03 02:21:57,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:21:57,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:21:57,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:21:57,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:21:57,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:21:57,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426639696] [2022-11-03 02:21:57,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426639696] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:21:57,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878656479] [2022-11-03 02:21:57,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:21:57,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:21:57,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:21:57,410 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:21:57,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:21:57,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:21:57,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 02:21:57,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:21:57,560 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:21:57,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:21:57,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:21:57,752 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-11-03 02:21:57,764 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2022-11-03 02:21:57,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:21:57,787 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878656479] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:21:57,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1077768515] [2022-11-03 02:21:57,811 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 02:21:57,811 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:21:57,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:21:57,820 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:21:57,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:21:57,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:57,952 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:21:57,952 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:21:57,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:57,978 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:21:58,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:58,012 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:21:58,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:58,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:58,170 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:21:58,171 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:21:58,275 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:21:58,360 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:21:58,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:21:58,760 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:21:58,761 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:21:58,761 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-11-03 02:21:58,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976751208] [2022-11-03 02:21:58,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:21:58,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 02:21:58,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:21:58,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 02:21:58,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-11-03 02:21:58,764 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:21:58,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:21:58,869 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2022-11-03 02:21:58,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 02:21:58,870 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-03 02:21:58,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:21:58,870 INFO L225 Difference]: With dead ends: 15 [2022-11-03 02:21:58,870 INFO L226 Difference]: Without dead ends: 13 [2022-11-03 02:21:58,871 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2022-11-03 02:21:58,872 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:21:58,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 13 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:21:58,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-03 02:21:58,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2022-11-03 02:21:58,876 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) [2022-11-03 02:21:58,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-11-03 02:21:58,877 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2022-11-03 02:21:58,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:21:58,877 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-11-03 02:21:58,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:21:58,878 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-11-03 02:21:58,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 02:21:58,878 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:21:58,879 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:21:58,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:21:59,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:21:59,095 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:21:59,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:21:59,096 INFO L85 PathProgramCache]: Analyzing trace with hash 43972795, now seen corresponding path program 1 times [2022-11-03 02:21:59,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:21:59,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930130422] [2022-11-03 02:21:59,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:21:59,096 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:21:59,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:21:59,251 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:21:59,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:21:59,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930130422] [2022-11-03 02:21:59,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930130422] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:21:59,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825531123] [2022-11-03 02:21:59,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:21:59,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:21:59,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:21:59,256 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:21:59,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:21:59,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:21:59,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 02:21:59,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:21:59,365 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:21:59,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:21:59,411 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:21:59,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825531123] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:21:59,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1826046488] [2022-11-03 02:21:59,421 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:21:59,421 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:21:59,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:21:59,422 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:21:59,422 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:21:59,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:59,477 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:21:59,478 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:21:59,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:59,494 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:21:59,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:59,528 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:21:59,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:59,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:21:59,643 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:21:59,649 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:21:59,723 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:21:59,801 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:00,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '208#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:00,154 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:00,154 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:00,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-11-03 02:22:00,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329027441] [2022-11-03 02:22:00,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:00,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 02:22:00,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:00,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 02:22:00,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2022-11-03 02:22:00,156 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 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) [2022-11-03 02:22:00,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:00,213 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2022-11-03 02:22:00,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:22:00,214 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 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 10 [2022-11-03 02:22:00,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:00,215 INFO L225 Difference]: With dead ends: 27 [2022-11-03 02:22:00,215 INFO L226 Difference]: Without dead ends: 18 [2022-11-03 02:22:00,215 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2022-11-03 02:22:00,216 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:00,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 17 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:22:00,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-03 02:22:00,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2022-11-03 02:22:00,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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) [2022-11-03 02:22:00,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2022-11-03 02:22:00,220 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2022-11-03 02:22:00,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:00,220 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2022-11-03 02:22:00,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 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) [2022-11-03 02:22:00,220 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2022-11-03 02:22:00,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 02:22:00,221 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:00,221 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:22:00,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:00,442 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:00,443 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:00,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:00,443 INFO L85 PathProgramCache]: Analyzing trace with hash -812263007, now seen corresponding path program 2 times [2022-11-03 02:22:00,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:00,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146822262] [2022-11-03 02:22:00,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:00,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:00,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:00,795 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:00,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:00,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146822262] [2022-11-03 02:22:00,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146822262] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:00,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833389552] [2022-11-03 02:22:00,796 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:22:00,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:00,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:00,797 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:00,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:22:00,855 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 02:22:00,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:00,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 02:22:00,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:00,878 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:00,970 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:00,993 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:00,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:01,085 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:01,088 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:01,095 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:01,100 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:01,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:01,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833389552] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:01,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [407131500] [2022-11-03 02:22:01,115 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:01,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:01,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:01,115 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:01,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:01,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:01,144 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:22:01,144 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:22:01,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:01,171 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:01,172 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:01,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:01,196 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:01,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:01,248 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:01,276 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:01,276 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:01,335 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:01,413 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:01,915 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:01,915 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:01,915 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:01,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2022-11-03 02:22:01,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732141475] [2022-11-03 02:22:01,915 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:01,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 02:22:01,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:01,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 02:22:01,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2022-11-03 02:22:01,917 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:02,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:02,069 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-11-03 02:22:02,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:22:02,069 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-03 02:22:02,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:02,070 INFO L225 Difference]: With dead ends: 19 [2022-11-03 02:22:02,070 INFO L226 Difference]: Without dead ends: 17 [2022-11-03 02:22:02,070 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 17 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2022-11-03 02:22:02,071 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 11 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:02,072 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:02,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-03 02:22:02,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2022-11-03 02:22:02,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:02,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-11-03 02:22:02,076 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-11-03 02:22:02,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:02,076 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-11-03 02:22:02,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:02,076 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-11-03 02:22:02,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 02:22:02,077 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:02,077 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-03 02:22:02,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:02,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:02,288 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:02,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:02,288 INFO L85 PathProgramCache]: Analyzing trace with hash -276702404, now seen corresponding path program 3 times [2022-11-03 02:22:02,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:02,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702413515] [2022-11-03 02:22:02,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:02,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:02,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:02,382 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:02,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:02,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702413515] [2022-11-03 02:22:02,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702413515] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:02,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017396332] [2022-11-03 02:22:02,383 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:22:02,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:02,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:02,384 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:02,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:22:02,445 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:22:02,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:02,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 02:22:02,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:02,518 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:02,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:02,602 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:02,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017396332] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:02,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1999995863] [2022-11-03 02:22:02,604 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:02,605 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:02,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:02,605 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:02,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:02,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:02,648 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:02,649 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:02,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:02,669 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:02,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:02,717 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:02,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:02,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:02,806 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:02,807 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:02,863 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:02,940 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:03,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '492#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:03,281 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:03,281 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:03,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-11-03 02:22:03,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443716241] [2022-11-03 02:22:03,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:03,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 02:22:03,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:03,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 02:22:03,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-11-03 02:22:03,283 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:03,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:03,371 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-11-03 02:22:03,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 02:22:03,373 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-03 02:22:03,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:03,373 INFO L225 Difference]: With dead ends: 34 [2022-11-03 02:22:03,373 INFO L226 Difference]: Without dead ends: 22 [2022-11-03 02:22:03,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 24 SyntacticMatches, 8 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:22:03,375 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:03,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 33 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:03,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-03 02:22:03,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2022-11-03 02:22:03,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:03,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-03 02:22:03,382 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2022-11-03 02:22:03,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:03,382 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-03 02:22:03,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:03,383 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-03 02:22:03,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 02:22:03,383 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:03,384 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2022-11-03 02:22:03,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:03,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:03,607 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:03,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:03,607 INFO L85 PathProgramCache]: Analyzing trace with hash -1296967390, now seen corresponding path program 4 times [2022-11-03 02:22:03,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:03,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125849101] [2022-11-03 02:22:03,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:03,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:03,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:03,958 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:03,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:03,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125849101] [2022-11-03 02:22:03,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1125849101] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:03,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867890005] [2022-11-03 02:22:03,959 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:22:03,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:03,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:03,961 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:03,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:22:04,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:04,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-03 02:22:04,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:04,052 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:04,157 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:04,176 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:04,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:04,257 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:04,259 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:04,265 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:04,272 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:04,288 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:04,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867890005] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:04,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1565493816] [2022-11-03 02:22:04,290 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:04,291 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:04,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:04,291 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:04,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:04,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:04,320 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:22:04,320 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:22:04,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:04,354 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:04,355 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:04,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:04,378 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:04,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:04,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:04,437 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:04,438 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:04,500 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:04,571 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:05,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '668#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:05,011 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:05,011 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:05,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 14 [2022-11-03 02:22:05,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388815001] [2022-11-03 02:22:05,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:05,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:22:05,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:05,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:22:05,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2022-11-03 02:22:05,012 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:05,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:05,227 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2022-11-03 02:22:05,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 02:22:05,228 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-03 02:22:05,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:05,228 INFO L225 Difference]: With dead ends: 23 [2022-11-03 02:22:05,228 INFO L226 Difference]: Without dead ends: 21 [2022-11-03 02:22:05,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 27 SyntacticMatches, 9 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:22:05,229 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:05,230 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 36 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:05,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-03 02:22:05,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-11-03 02:22:05,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 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) [2022-11-03 02:22:05,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-11-03 02:22:05,236 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2022-11-03 02:22:05,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:05,237 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-11-03 02:22:05,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:05,237 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-11-03 02:22:05,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-03 02:22:05,238 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:05,238 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2022-11-03 02:22:05,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:05,450 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:05,451 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:05,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:05,451 INFO L85 PathProgramCache]: Analyzing trace with hash -424927205, now seen corresponding path program 5 times [2022-11-03 02:22:05,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:05,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563221897] [2022-11-03 02:22:05,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:05,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:05,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:05,562 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:05,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:05,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563221897] [2022-11-03 02:22:05,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563221897] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:05,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490083789] [2022-11-03 02:22:05,563 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:22:05,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:05,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:05,565 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:05,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:22:05,638 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 02:22:05,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:05,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 02:22:05,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:05,731 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:05,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:05,805 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:05,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490083789] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:05,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [331446895] [2022-11-03 02:22:05,810 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:05,810 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:05,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:05,811 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:05,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:05,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:05,848 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:05,849 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:05,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:05,860 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:05,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:05,880 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:05,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:05,923 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:05,949 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:05,950 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:06,001 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:06,075 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:06,475 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '862#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:06,475 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:06,475 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:06,475 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-11-03 02:22:06,475 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241332717] [2022-11-03 02:22:06,475 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:06,476 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 02:22:06,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:06,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 02:22:06,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2022-11-03 02:22:06,477 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:06,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:06,566 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-11-03 02:22:06,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 02:22:06,567 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-03 02:22:06,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:06,568 INFO L225 Difference]: With dead ends: 41 [2022-11-03 02:22:06,568 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 02:22:06,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 32 SyntacticMatches, 11 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2022-11-03 02:22:06,569 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 32 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:06,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 32 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:06,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 02:22:06,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-11-03 02:22:06,574 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) [2022-11-03 02:22:06,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-03 02:22:06,574 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2022-11-03 02:22:06,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:06,575 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-03 02:22:06,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:06,575 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-03 02:22:06,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-03 02:22:06,575 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:06,575 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-03 02:22:06,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:06,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:06,779 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:06,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:06,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1950268161, now seen corresponding path program 6 times [2022-11-03 02:22:06,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:06,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239859354] [2022-11-03 02:22:06,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:06,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:06,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:07,165 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:07,166 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:07,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239859354] [2022-11-03 02:22:07,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239859354] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:07,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226381504] [2022-11-03 02:22:07,166 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:22:07,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:07,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:07,167 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:07,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:22:07,224 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:22:07,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:07,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-03 02:22:07,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:07,249 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:07,386 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:07,428 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:07,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:07,570 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:07,572 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:07,580 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:07,584 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:07,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226381504] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:07,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [583282984] [2022-11-03 02:22:07,606 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:07,606 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:07,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:07,607 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:07,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:07,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:07,634 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:22:07,635 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:22:07,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:07,666 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:07,666 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:07,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:07,689 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:07,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:07,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:07,753 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:07,754 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:07,797 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:07,861 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:08,309 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1083#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:08,309 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:08,309 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:08,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 17 [2022-11-03 02:22:08,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645812379] [2022-11-03 02:22:08,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:08,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 02:22:08,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:08,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 02:22:08,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=404, Unknown=0, NotChecked=0, Total=462 [2022-11-03 02:22:08,311 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:08,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:08,599 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-11-03 02:22:08,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 02:22:08,600 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-03 02:22:08,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:08,600 INFO L225 Difference]: With dead ends: 27 [2022-11-03 02:22:08,600 INFO L226 Difference]: Without dead ends: 25 [2022-11-03 02:22:08,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 37 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:22:08,602 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 12 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:08,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 52 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:22:08,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-03 02:22:08,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2022-11-03 02:22:08,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:08,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-11-03 02:22:08,608 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2022-11-03 02:22:08,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:08,609 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-11-03 02:22:08,609 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:08,609 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-11-03 02:22:08,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-03 02:22:08,610 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:08,610 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-03 02:22:08,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:08,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-03 02:22:08,815 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:08,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:08,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1874002468, now seen corresponding path program 7 times [2022-11-03 02:22:08,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:08,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065684511] [2022-11-03 02:22:08,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:08,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:08,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:09,014 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:09,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:09,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065684511] [2022-11-03 02:22:09,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2065684511] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:09,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537660135] [2022-11-03 02:22:09,015 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:22:09,015 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:09,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:09,016 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:09,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:22:09,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:09,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 02:22:09,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:09,215 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:09,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:09,305 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:09,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537660135] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:09,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [24307828] [2022-11-03 02:22:09,308 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:09,308 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:09,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:09,309 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:09,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:09,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:09,338 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:22:09,339 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:22:09,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:09,365 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:09,366 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:09,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:09,384 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:09,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:09,428 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:09,456 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:09,457 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:09,511 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:09,589 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:09,987 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1318#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:09,987 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:09,987 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:09,987 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-11-03 02:22:09,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591821054] [2022-11-03 02:22:09,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:09,988 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:22:09,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:09,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:22:09,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-11-03 02:22:09,989 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:10,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:10,132 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2022-11-03 02:22:10,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 02:22:10,132 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-03 02:22:10,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:10,133 INFO L225 Difference]: With dead ends: 48 [2022-11-03 02:22:10,133 INFO L226 Difference]: Without dead ends: 30 [2022-11-03 02:22:10,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 40 SyntacticMatches, 14 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2022-11-03 02:22:10,134 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 36 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:10,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 37 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:10,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-03 02:22:10,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2022-11-03 02:22:10,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:10,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-11-03 02:22:10,140 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2022-11-03 02:22:10,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:10,141 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-11-03 02:22:10,141 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:10,141 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-11-03 02:22:10,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-03 02:22:10,142 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:10,142 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-11-03 02:22:10,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:10,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-03 02:22:10,367 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:10,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:10,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1951681086, now seen corresponding path program 8 times [2022-11-03 02:22:10,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:10,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463643792] [2022-11-03 02:22:10,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:10,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:10,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:10,810 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:10,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:10,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463643792] [2022-11-03 02:22:10,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463643792] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:10,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159987397] [2022-11-03 02:22:10,811 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:22:10,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:10,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:10,815 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:10,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:22:10,893 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 02:22:10,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:10,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-03 02:22:10,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:10,940 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:11,168 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:11,196 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:11,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:11,334 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:11,337 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:11,352 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:11,354 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:11,379 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:11,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159987397] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:11,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2070386962] [2022-11-03 02:22:11,381 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:11,381 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:11,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:11,382 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:11,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:11,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:11,408 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:11,409 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:11,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:11,418 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:11,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:11,436 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:11,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:11,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:11,499 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:11,499 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:11,541 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:11,611 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:12,108 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1584#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:12,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:12,108 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:12,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 20 [2022-11-03 02:22:12,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661075147] [2022-11-03 02:22:12,108 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:12,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-03 02:22:12,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:12,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-03 02:22:12,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=534, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:22:12,110 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:12,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:12,477 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2022-11-03 02:22:12,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-03 02:22:12,478 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-03 02:22:12,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:12,479 INFO L225 Difference]: With dead ends: 31 [2022-11-03 02:22:12,479 INFO L226 Difference]: Without dead ends: 29 [2022-11-03 02:22:12,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 47 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=121, Invalid=935, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:22:12,480 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 15 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:12,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 75 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:22:12,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-03 02:22:12,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2022-11-03 02:22:12,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:12,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-11-03 02:22:12,488 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2022-11-03 02:22:12,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:12,488 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-11-03 02:22:12,488 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:12,489 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-11-03 02:22:12,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-03 02:22:12,489 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:12,489 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1] [2022-11-03 02:22:12,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:12,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 02:22:12,695 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:12,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:12,695 INFO L85 PathProgramCache]: Analyzing trace with hash -1554153605, now seen corresponding path program 9 times [2022-11-03 02:22:12,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:12,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685026029] [2022-11-03 02:22:12,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:12,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:12,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:12,863 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:12,863 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:12,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685026029] [2022-11-03 02:22:12,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685026029] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:12,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770134846] [2022-11-03 02:22:12,864 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:22:12,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:12,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:12,867 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:12,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:22:12,937 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:22:12,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:12,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 02:22:12,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:13,104 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:13,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:13,219 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:13,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770134846] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:13,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1141612860] [2022-11-03 02:22:13,223 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:13,223 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:13,223 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:13,223 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:13,224 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:13,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:13,258 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:13,258 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:13,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:13,268 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:13,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:13,289 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:13,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:13,340 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:13,364 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:13,364 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:13,412 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:13,484 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:13,936 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1860#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:13,936 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:13,937 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:13,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-11-03 02:22:13,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354064335] [2022-11-03 02:22:13,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:13,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:22:13,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:13,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:22:13,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2022-11-03 02:22:13,939 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:14,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:14,113 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2022-11-03 02:22:14,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 02:22:14,114 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-03 02:22:14,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:14,115 INFO L225 Difference]: With dead ends: 55 [2022-11-03 02:22:14,115 INFO L226 Difference]: Without dead ends: 34 [2022-11-03 02:22:14,116 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 48 SyntacticMatches, 17 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2022-11-03 02:22:14,116 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 44 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:14,117 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 59 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:14,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-03 02:22:14,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2022-11-03 02:22:14,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:14,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2022-11-03 02:22:14,129 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2022-11-03 02:22:14,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:14,130 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2022-11-03 02:22:14,130 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:14,130 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2022-11-03 02:22:14,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-03 02:22:14,131 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:14,131 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2022-11-03 02:22:14,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:14,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-03 02:22:14,355 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:14,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:14,355 INFO L85 PathProgramCache]: Analyzing trace with hash -550382495, now seen corresponding path program 10 times [2022-11-03 02:22:14,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:14,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272970585] [2022-11-03 02:22:14,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:14,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:14,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:14,913 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:14,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:14,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272970585] [2022-11-03 02:22:14,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1272970585] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:14,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553909691] [2022-11-03 02:22:14,913 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:22:14,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:14,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:14,915 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:14,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:22:14,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:14,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-03 02:22:15,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:15,026 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:15,267 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:15,297 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:15,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:15,446 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:15,448 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:15,458 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:15,460 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:15,487 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:15,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553909691] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:15,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1891372318] [2022-11-03 02:22:15,489 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:15,489 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:15,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:15,490 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:15,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:15,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:15,522 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:15,522 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:15,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:15,534 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:15,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:15,558 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:15,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:15,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:15,620 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:15,621 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:15,663 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:15,731 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:16,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2171#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:16,297 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:16,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:16,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 23 [2022-11-03 02:22:16,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939636779] [2022-11-03 02:22:16,298 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:16,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 02:22:16,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:16,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 02:22:16,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=682, Unknown=0, NotChecked=0, Total=756 [2022-11-03 02:22:16,299 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:16,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:16,752 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2022-11-03 02:22:16,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-03 02:22:16,753 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 states have internal predecessors, (47), 0 states have call successors, (0), 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 27 [2022-11-03 02:22:16,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:16,753 INFO L225 Difference]: With dead ends: 35 [2022-11-03 02:22:16,753 INFO L226 Difference]: Without dead ends: 33 [2022-11-03 02:22:16,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 57 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=136, Invalid=1196, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 02:22:16,755 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 15 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:16,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 120 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:22:16,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-03 02:22:16,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2022-11-03 02:22:16,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 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) [2022-11-03 02:22:16,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2022-11-03 02:22:16,762 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 27 [2022-11-03 02:22:16,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:16,763 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2022-11-03 02:22:16,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:16,763 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2022-11-03 02:22:16,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-03 02:22:16,764 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:16,764 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1] [2022-11-03 02:22:16,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:16,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:16,964 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:16,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:16,965 INFO L85 PathProgramCache]: Analyzing trace with hash 1745021052, now seen corresponding path program 11 times [2022-11-03 02:22:16,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:16,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558168145] [2022-11-03 02:22:16,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:16,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:16,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:17,223 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:17,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:17,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558168145] [2022-11-03 02:22:17,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558168145] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:17,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246712214] [2022-11-03 02:22:17,224 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:22:17,224 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:17,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:17,226 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:17,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:22:17,406 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-03 02:22:17,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:17,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 02:22:17,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:17,634 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:17,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:17,778 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:17,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246712214] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:17,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1342959478] [2022-11-03 02:22:17,780 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:17,780 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:17,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:17,781 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:17,781 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:17,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:17,810 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:17,810 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:17,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:17,820 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:17,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:17,844 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:17,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:17,896 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:17,920 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:17,920 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:18,001 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:18,056 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:18,330 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2488#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:18,331 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:18,331 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:18,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-11-03 02:22:18,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654074428] [2022-11-03 02:22:18,331 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:18,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 02:22:18,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:18,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 02:22:18,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2022-11-03 02:22:18,333 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:18,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:18,496 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2022-11-03 02:22:18,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:22:18,497 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 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 30 [2022-11-03 02:22:18,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:18,497 INFO L225 Difference]: With dead ends: 62 [2022-11-03 02:22:18,498 INFO L226 Difference]: Without dead ends: 38 [2022-11-03 02:22:18,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 63 SyntacticMatches, 13 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 519 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=257, Invalid=1003, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 02:22:18,499 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 52 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:18,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 51 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:18,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-03 02:22:18,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2022-11-03 02:22:18,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:18,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-11-03 02:22:18,506 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 30 [2022-11-03 02:22:18,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:18,507 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-11-03 02:22:18,507 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:18,507 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-11-03 02:22:18,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 02:22:18,508 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:18,508 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2022-11-03 02:22:18,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:18,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 02:22:18,715 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:18,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:18,715 INFO L85 PathProgramCache]: Analyzing trace with hash 1177967202, now seen corresponding path program 12 times [2022-11-03 02:22:18,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:18,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063590135] [2022-11-03 02:22:18,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:18,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:18,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:19,376 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:19,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:19,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063590135] [2022-11-03 02:22:19,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063590135] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:19,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045716208] [2022-11-03 02:22:19,377 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:22:19,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:19,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:19,378 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:19,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:22:19,444 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:22:19,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:19,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-03 02:22:19,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:19,476 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:19,791 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:19,822 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:19,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:20,017 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:20,020 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:20,029 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:20,032 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:20,072 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:20,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045716208] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:20,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1110697047] [2022-11-03 02:22:20,075 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:20,076 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:20,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:20,076 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:20,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:20,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:20,107 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:20,108 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:20,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:20,117 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:20,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:20,135 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:20,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:20,194 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:20,222 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:20,223 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:20,298 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:20,352 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:20,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2844#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:20,703 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:20,703 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:20,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 26 [2022-11-03 02:22:20,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504315621] [2022-11-03 02:22:20,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:20,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 02:22:20,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:20,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 02:22:20,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=848, Unknown=0, NotChecked=0, Total=930 [2022-11-03 02:22:20,705 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:21,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:21,238 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2022-11-03 02:22:21,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-03 02:22:21,239 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-03 02:22:21,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:21,239 INFO L225 Difference]: With dead ends: 39 [2022-11-03 02:22:21,239 INFO L226 Difference]: Without dead ends: 37 [2022-11-03 02:22:21,240 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=151, Invalid=1489, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 02:22:21,242 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 17 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:21,242 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 133 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:22:21,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-03 02:22:21,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2022-11-03 02:22:21,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:21,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-11-03 02:22:21,251 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 31 [2022-11-03 02:22:21,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:21,251 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-11-03 02:22:21,252 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:21,252 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-11-03 02:22:21,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-03 02:22:21,253 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:21,253 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2022-11-03 02:22:21,281 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-03 02:22:21,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 02:22:21,467 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:21,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:21,467 INFO L85 PathProgramCache]: Analyzing trace with hash -1352067365, now seen corresponding path program 13 times [2022-11-03 02:22:21,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:21,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683012831] [2022-11-03 02:22:21,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:21,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:21,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:21,745 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:21,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:21,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683012831] [2022-11-03 02:22:21,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683012831] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:21,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823837136] [2022-11-03 02:22:21,746 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:22:21,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:21,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:21,747 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:21,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:22:21,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:21,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-03 02:22:21,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:22,126 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:22,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:22,317 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:22,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823837136] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:22,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [139004353] [2022-11-03 02:22:22,319 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:22,319 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:22,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:22,319 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:22,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:22,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:22,350 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:22,351 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:22,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:22,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:22,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:22,378 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:22,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:22,418 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:22,443 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:22,444 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:22,503 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:22,547 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:22,859 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3202#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:22,859 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:22,859 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:22,859 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-11-03 02:22:22,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911092762] [2022-11-03 02:22:22,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:22,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-03 02:22:22,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:22,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-03 02:22:22,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=849, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:22:22,861 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:23,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:23,097 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-11-03 02:22:23,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 02:22:23,097 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-03 02:22:23,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:23,098 INFO L225 Difference]: With dead ends: 69 [2022-11-03 02:22:23,098 INFO L226 Difference]: Without dead ends: 42 [2022-11-03 02:22:23,099 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 72 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=319, Invalid=1241, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:22:23,099 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 60 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:23,100 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 62 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:23,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-03 02:22:23,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2022-11-03 02:22:23,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:23,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2022-11-03 02:22:23,108 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 34 [2022-11-03 02:22:23,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:23,109 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2022-11-03 02:22:23,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:23,109 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2022-11-03 02:22:23,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-03 02:22:23,110 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:23,110 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2022-11-03 02:22:23,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:23,326 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 02:22:23,327 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:23,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:23,327 INFO L85 PathProgramCache]: Analyzing trace with hash -2128271935, now seen corresponding path program 14 times [2022-11-03 02:22:23,327 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:23,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688875955] [2022-11-03 02:22:23,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:23,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:23,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:24,018 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:24,018 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:24,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688875955] [2022-11-03 02:22:24,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688875955] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:24,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857168665] [2022-11-03 02:22:24,019 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:22:24,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:24,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:24,020 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:24,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 02:22:24,281 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-03 02:22:24,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:24,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-03 02:22:24,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:24,331 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:24,735 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:24,774 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:24,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:24,971 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:24,973 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:24,979 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:24,985 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:25,020 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:25,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857168665] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:25,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [283563543] [2022-11-03 02:22:25,022 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:25,022 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:25,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:25,023 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:25,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:25,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:25,053 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:25,054 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:25,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:25,063 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:25,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:25,082 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:25,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:25,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:25,140 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:25,140 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:25,182 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:25,225 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:25,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3603#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:25,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:25,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:25,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 29 [2022-11-03 02:22:25,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883739524] [2022-11-03 02:22:25,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:25,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-03 02:22:25,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:25,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-03 02:22:25,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=1032, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 02:22:25,944 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:26,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:26,624 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2022-11-03 02:22:26,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-03 02:22:26,624 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 states have internal predecessors, (61), 0 states have call successors, (0), 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 35 [2022-11-03 02:22:26,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:26,625 INFO L225 Difference]: With dead ends: 43 [2022-11-03 02:22:26,625 INFO L226 Difference]: Without dead ends: 41 [2022-11-03 02:22:26,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 77 SyntacticMatches, 14 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=166, Invalid=1814, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:22:26,626 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 17 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:26,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 191 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:22:26,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-03 02:22:26,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2022-11-03 02:22:26,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:26,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-11-03 02:22:26,635 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2022-11-03 02:22:26,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:26,636 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-11-03 02:22:26,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:26,636 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-11-03 02:22:26,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 02:22:26,636 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:26,637 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1] [2022-11-03 02:22:26,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:26,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 02:22:26,837 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:26,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:26,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1037198564, now seen corresponding path program 15 times [2022-11-03 02:22:26,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:26,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827208055] [2022-11-03 02:22:26,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:26,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:26,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:27,162 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:27,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:27,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827208055] [2022-11-03 02:22:27,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827208055] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:27,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141131095] [2022-11-03 02:22:27,163 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:22:27,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:27,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:27,165 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:27,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 02:22:27,251 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:22:27,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:27,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 02:22:27,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:27,543 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:27,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:27,740 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:27,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141131095] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:27,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [567755760] [2022-11-03 02:22:27,742 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:27,742 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:27,743 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:27,743 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:27,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:27,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:27,774 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:27,774 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:27,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:27,787 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:27,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:27,814 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:27,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:27,856 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:27,880 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:27,880 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:27,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:27,982 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:28,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4002#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:28,276 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:28,276 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:28,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-11-03 02:22:28,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959974894] [2022-11-03 02:22:28,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:28,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-03 02:22:28,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:28,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-03 02:22:28,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=1012, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 02:22:28,278 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:28,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:28,476 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2022-11-03 02:22:28,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-03 02:22:28,476 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 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 38 [2022-11-03 02:22:28,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:28,477 INFO L225 Difference]: With dead ends: 76 [2022-11-03 02:22:28,477 INFO L226 Difference]: Without dead ends: 46 [2022-11-03 02:22:28,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 81 SyntacticMatches, 17 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=388, Invalid=1504, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 02:22:28,479 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 72 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:28,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 65 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:28,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-03 02:22:28,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2022-11-03 02:22:28,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:28,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-03 02:22:28,488 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2022-11-03 02:22:28,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:28,489 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-03 02:22:28,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:28,489 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-03 02:22:28,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-03 02:22:28,490 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:28,490 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2022-11-03 02:22:28,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:28,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 02:22:28,699 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:28,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:28,699 INFO L85 PathProgramCache]: Analyzing trace with hash 668714754, now seen corresponding path program 16 times [2022-11-03 02:22:28,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:28,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298949025] [2022-11-03 02:22:28,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:28,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:28,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:29,443 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:29,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:29,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298949025] [2022-11-03 02:22:29,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298949025] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:29,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287526584] [2022-11-03 02:22:29,443 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:22:29,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:29,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:29,447 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:29,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 02:22:29,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:29,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-03 02:22:29,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:29,584 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:30,055 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:30,096 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:30,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:30,325 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:30,328 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:30,335 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:30,338 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:30,376 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:30,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [287526584] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:30,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1745190278] [2022-11-03 02:22:30,378 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:30,378 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:30,378 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:30,378 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:30,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:30,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:30,410 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:30,411 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:30,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:30,423 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:30,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:30,438 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:30,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:30,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:30,497 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:30,498 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:30,550 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:30,644 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:31,454 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4448#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:31,454 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:31,455 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:31,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 32 [2022-11-03 02:22:31,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189580581] [2022-11-03 02:22:31,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:31,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-03 02:22:31,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:31,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-03 02:22:31,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1234, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 02:22:31,457 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 32 states, 32 states have (on average 2.125) internal successors, (68), 32 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) [2022-11-03 02:22:32,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:32,239 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2022-11-03 02:22:32,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-03 02:22:32,241 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 32 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 39 [2022-11-03 02:22:32,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:32,241 INFO L225 Difference]: With dead ends: 47 [2022-11-03 02:22:32,241 INFO L226 Difference]: Without dead ends: 45 [2022-11-03 02:22:32,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 87 SyntacticMatches, 15 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=181, Invalid=2171, Unknown=0, NotChecked=0, Total=2352 [2022-11-03 02:22:32,243 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 19 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 832 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 872 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:32,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 239 Invalid, 872 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 832 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:22:32,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-03 02:22:32,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2022-11-03 02:22:32,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:32,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-11-03 02:22:32,256 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2022-11-03 02:22:32,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:32,258 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-11-03 02:22:32,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 32 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) [2022-11-03 02:22:32,258 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-11-03 02:22:32,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-03 02:22:32,261 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:32,261 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1] [2022-11-03 02:22:32,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:32,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 02:22:32,476 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:32,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:32,477 INFO L85 PathProgramCache]: Analyzing trace with hash 1627711035, now seen corresponding path program 17 times [2022-11-03 02:22:32,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:32,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987754590] [2022-11-03 02:22:32,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:32,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:32,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:32,849 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:32,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:32,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987754590] [2022-11-03 02:22:32,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987754590] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:32,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317081293] [2022-11-03 02:22:32,850 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:22:32,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:32,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:32,852 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:32,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 02:22:33,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-03 02:22:33,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:33,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 02:22:33,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:33,444 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:33,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:33,708 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:33,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317081293] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:33,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [859351559] [2022-11-03 02:22:33,710 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:33,710 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:33,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:33,710 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:33,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:33,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:33,739 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:33,740 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:33,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:33,750 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:33,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:33,767 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:33,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:33,808 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:33,832 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:33,833 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:33,898 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:33,943 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:34,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4888#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:34,268 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:34,268 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:34,269 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-11-03 02:22:34,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111931248] [2022-11-03 02:22:34,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:34,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-03 02:22:34,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:34,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-03 02:22:34,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1189, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 02:22:34,271 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:34,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:34,501 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2022-11-03 02:22:34,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 02:22:34,501 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-03 02:22:34,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:34,502 INFO L225 Difference]: With dead ends: 83 [2022-11-03 02:22:34,502 INFO L226 Difference]: Without dead ends: 50 [2022-11-03 02:22:34,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 90 SyntacticMatches, 19 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=464, Invalid=1792, Unknown=0, NotChecked=0, Total=2256 [2022-11-03 02:22:34,504 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 88 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:34,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 75 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:34,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-03 02:22:34,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2022-11-03 02:22:34,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:34,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-11-03 02:22:34,515 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 42 [2022-11-03 02:22:34,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:34,515 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-11-03 02:22:34,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:34,515 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-11-03 02:22:34,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 02:22:34,516 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:34,516 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2022-11-03 02:22:34,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:34,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:34,723 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:34,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:34,723 INFO L85 PathProgramCache]: Analyzing trace with hash -1437683935, now seen corresponding path program 18 times [2022-11-03 02:22:34,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:34,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791226163] [2022-11-03 02:22:34,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:34,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:34,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:35,587 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:35,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:35,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791226163] [2022-11-03 02:22:35,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791226163] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:35,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694122972] [2022-11-03 02:22:35,588 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:22:35,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:35,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:35,591 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:35,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 02:22:35,708 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:22:35,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:35,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-03 02:22:35,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:35,753 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:36,325 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:36,373 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:36,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:36,601 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:36,603 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:36,608 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:36,610 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:36,654 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:36,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694122972] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:36,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1156528732] [2022-11-03 02:22:36,656 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:36,656 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:36,656 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:36,657 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:36,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:36,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:36,689 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:36,689 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:36,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:36,702 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:36,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:36,719 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:36,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:36,753 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:36,776 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:36,777 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:36,821 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:36,883 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:37,812 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5379#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:37,813 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:37,813 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:37,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 35 [2022-11-03 02:22:37,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318629987] [2022-11-03 02:22:37,813 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:37,814 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-03 02:22:37,814 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:37,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-03 02:22:37,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1454, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:22:37,815 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:38,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:38,642 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2022-11-03 02:22:38,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-03 02:22:38,643 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-11-03 02:22:38,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:38,643 INFO L225 Difference]: With dead ends: 51 [2022-11-03 02:22:38,643 INFO L226 Difference]: Without dead ends: 49 [2022-11-03 02:22:38,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 97 SyntacticMatches, 16 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=196, Invalid=2560, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 02:22:38,645 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 902 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 902 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:38,645 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 265 Invalid, 947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 902 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:22:38,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-03 02:22:38,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2022-11-03 02:22:38,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:38,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2022-11-03 02:22:38,659 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 43 [2022-11-03 02:22:38,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:38,660 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2022-11-03 02:22:38,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:38,660 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2022-11-03 02:22:38,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-03 02:22:38,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:38,661 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1] [2022-11-03 02:22:38,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:38,870 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:38,871 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:38,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:38,871 INFO L85 PathProgramCache]: Analyzing trace with hash -623438404, now seen corresponding path program 19 times [2022-11-03 02:22:38,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:38,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988531435] [2022-11-03 02:22:38,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:38,871 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:38,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:39,329 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:39,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:39,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988531435] [2022-11-03 02:22:39,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988531435] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:39,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856002665] [2022-11-03 02:22:39,330 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:22:39,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:39,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:39,335 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:39,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 02:22:39,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:39,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 02:22:39,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:39,823 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:39,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:40,093 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:40,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856002665] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:40,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1645104002] [2022-11-03 02:22:40,094 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:40,095 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:40,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:40,095 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:40,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:40,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:40,120 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:40,120 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:40,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:40,129 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:40,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:40,154 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:40,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:40,193 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:40,216 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:40,216 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:40,292 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:40,339 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:40,658 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5860#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:40,658 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:40,658 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:40,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-11-03 02:22:40,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946434885] [2022-11-03 02:22:40,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:40,659 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-03 02:22:40,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:40,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-03 02:22:40,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=1380, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 02:22:40,663 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:40,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:40,930 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2022-11-03 02:22:40,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 02:22:40,931 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 states have internal predecessors, (84), 0 states have call successors, (0), 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 46 [2022-11-03 02:22:40,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:40,932 INFO L225 Difference]: With dead ends: 90 [2022-11-03 02:22:40,932 INFO L226 Difference]: Without dead ends: 54 [2022-11-03 02:22:40,933 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 99 SyntacticMatches, 21 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=547, Invalid=2105, Unknown=0, NotChecked=0, Total=2652 [2022-11-03 02:22:40,933 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 100 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:40,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 89 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:40,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-03 02:22:40,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2022-11-03 02:22:40,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:40,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-11-03 02:22:40,942 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 46 [2022-11-03 02:22:40,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:40,943 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-11-03 02:22:40,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:40,943 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-11-03 02:22:40,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-03 02:22:40,943 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:40,943 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-11-03 02:22:40,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:41,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:41,159 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:41,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:41,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1722153890, now seen corresponding path program 20 times [2022-11-03 02:22:41,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:41,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432113959] [2022-11-03 02:22:41,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:41,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:41,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:42,067 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:42,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:42,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432113959] [2022-11-03 02:22:42,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432113959] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:42,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77048424] [2022-11-03 02:22:42,070 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:22:42,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:42,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:42,071 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:42,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 02:22:42,429 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-03 02:22:42,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:42,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-03 02:22:42,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:42,475 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:43,037 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:43,074 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:43,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:43,311 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:43,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:43,322 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:43,325 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:43,380 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:43,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77048424] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:43,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1547971188] [2022-11-03 02:22:43,382 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:43,382 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:43,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:43,382 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:43,383 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:43,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:43,413 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:43,414 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:43,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:43,422 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:22:43,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:43,439 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:43,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:43,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:43,494 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:43,494 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:43,536 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:43,582 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:44,565 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6396#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:44,566 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:44,566 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:44,566 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 38 [2022-11-03 02:22:44,566 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642469268] [2022-11-03 02:22:44,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:44,567 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-03 02:22:44,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:44,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-03 02:22:44,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1692, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 02:22:44,568 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:45,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:45,619 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2022-11-03 02:22:45,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-03 02:22:45,620 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 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 47 [2022-11-03 02:22:45,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:45,621 INFO L225 Difference]: With dead ends: 55 [2022-11-03 02:22:45,621 INFO L226 Difference]: Without dead ends: 53 [2022-11-03 02:22:45,622 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 107 SyntacticMatches, 17 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=211, Invalid=2981, Unknown=0, NotChecked=0, Total=3192 [2022-11-03 02:22:45,622 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 22 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 1068 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 1117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1068 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:45,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 313 Invalid, 1117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1068 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:22:45,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-03 02:22:45,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2022-11-03 02:22:45,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:45,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-11-03 02:22:45,650 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 47 [2022-11-03 02:22:45,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:45,650 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-11-03 02:22:45,650 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:45,651 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-11-03 02:22:45,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-03 02:22:45,651 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:45,651 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1] [2022-11-03 02:22:45,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:45,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-03 02:22:45,859 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:45,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:45,859 INFO L85 PathProgramCache]: Analyzing trace with hash 1306979739, now seen corresponding path program 21 times [2022-11-03 02:22:45,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:45,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979181047] [2022-11-03 02:22:45,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:45,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:45,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:46,306 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:46,307 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:46,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979181047] [2022-11-03 02:22:46,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979181047] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:46,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998192896] [2022-11-03 02:22:46,307 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:22:46,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:46,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:46,308 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:46,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 02:22:46,401 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:22:46,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:46,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 02:22:46,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:46,778 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:46,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:47,063 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:47,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998192896] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:47,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074119330] [2022-11-03 02:22:47,068 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:47,068 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:47,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:47,069 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:47,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:47,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:47,092 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:22:47,092 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:22:47,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:47,119 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:47,119 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:47,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:47,147 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:47,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:47,184 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:47,208 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:47,208 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:47,266 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:47,315 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:47,640 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6918#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:47,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:47,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:47,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-11-03 02:22:47,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768987146] [2022-11-03 02:22:47,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:47,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-03 02:22:47,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:47,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-03 02:22:47,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1585, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:22:47,642 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:47,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:47,937 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2022-11-03 02:22:47,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-03 02:22:47,938 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-11-03 02:22:47,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:47,938 INFO L225 Difference]: With dead ends: 97 [2022-11-03 02:22:47,938 INFO L226 Difference]: Without dead ends: 58 [2022-11-03 02:22:47,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 108 SyntacticMatches, 23 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1289 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=637, Invalid=2443, Unknown=0, NotChecked=0, Total=3080 [2022-11-03 02:22:47,940 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 128 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:47,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 93 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:22:47,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-03 02:22:47,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2022-11-03 02:22:47,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:47,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-11-03 02:22:47,952 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2022-11-03 02:22:47,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:47,953 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-11-03 02:22:47,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:47,953 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-11-03 02:22:47,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-03 02:22:47,954 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:47,954 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2022-11-03 02:22:47,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:48,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:48,167 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:48,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:48,167 INFO L85 PathProgramCache]: Analyzing trace with hash -362516351, now seen corresponding path program 22 times [2022-11-03 02:22:48,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:48,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87227077] [2022-11-03 02:22:48,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:48,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:48,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:49,123 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:49,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:49,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87227077] [2022-11-03 02:22:49,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87227077] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:49,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173524588] [2022-11-03 02:22:49,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:22:49,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:49,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:49,127 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:49,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 02:22:49,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:49,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-03 02:22:49,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:49,280 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:22:49,913 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:22:49,950 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:49,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:50,234 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:50,237 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:50,243 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:50,245 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:50,298 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:50,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173524588] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:50,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229659723] [2022-11-03 02:22:50,300 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:50,301 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:50,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:50,301 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:50,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:50,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:50,327 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:22:50,327 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:22:50,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:50,355 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:50,355 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:50,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:50,372 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:50,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:50,416 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:22:50,440 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:22:50,440 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:22:50,497 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:50,541 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:50,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7499#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:50,991 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:50,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:50,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 41 [2022-11-03 02:22:50,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674250384] [2022-11-03 02:22:50,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:50,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-03 02:22:50,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:50,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-03 02:22:50,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1948, Unknown=0, NotChecked=0, Total=2070 [2022-11-03 02:22:50,994 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:52,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:52,063 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2022-11-03 02:22:52,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-03 02:22:52,063 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-03 02:22:52,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:52,064 INFO L225 Difference]: With dead ends: 59 [2022-11-03 02:22:52,064 INFO L226 Difference]: Without dead ends: 57 [2022-11-03 02:22:52,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 129 SyntacticMatches, 6 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 477 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=226, Invalid=3434, Unknown=0, NotChecked=0, Total=3660 [2022-11-03 02:22:52,066 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 21 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 1287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:52,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 368 Invalid, 1287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:22:52,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-03 02:22:52,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2022-11-03 02:22:52,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:52,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2022-11-03 02:22:52,078 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 51 [2022-11-03 02:22:52,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:52,078 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2022-11-03 02:22:52,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:52,078 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2022-11-03 02:22:52,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-03 02:22:52,079 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:52,079 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1] [2022-11-03 02:22:52,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:52,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-03 02:22:52,279 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:52,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:52,280 INFO L85 PathProgramCache]: Analyzing trace with hash 2122930268, now seen corresponding path program 23 times [2022-11-03 02:22:52,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:52,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055461668] [2022-11-03 02:22:52,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:52,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:52,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:52,795 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:52,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:52,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055461668] [2022-11-03 02:22:52,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055461668] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:52,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043917620] [2022-11-03 02:22:52,795 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:22:52,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:52,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:52,797 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:52,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-03 02:22:53,181 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-03 02:22:53,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:53,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 02:22:53,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:53,624 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:53,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:53,947 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:53,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1043917620] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:53,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1139051873] [2022-11-03 02:22:53,948 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:53,948 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:53,949 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:53,949 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:53,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:53,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:53,975 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:22:53,975 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:22:53,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:54,002 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:54,002 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:54,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:54,022 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:54,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:54,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:54,073 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:54,073 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:54,113 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:54,165 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:22:54,931 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8062#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:22:54,931 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:22:54,931 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:22:54,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-11-03 02:22:54,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680256516] [2022-11-03 02:22:54,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:22:54,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-03 02:22:54,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:22:54,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-03 02:22:54,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=1804, Unknown=0, NotChecked=0, Total=2256 [2022-11-03 02:22:54,934 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:55,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:22:55,255 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2022-11-03 02:22:55,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-03 02:22:55,256 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 states have internal predecessors, (98), 0 states have call successors, (0), 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 54 [2022-11-03 02:22:55,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:22:55,256 INFO L225 Difference]: With dead ends: 104 [2022-11-03 02:22:55,256 INFO L226 Difference]: Without dead ends: 62 [2022-11-03 02:22:55,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 104 SyntacticMatches, 38 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2026 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=734, Invalid=2806, Unknown=0, NotChecked=0, Total=3540 [2022-11-03 02:22:55,258 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 140 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:22:55,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 115 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:22:55,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-03 02:22:55,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 56. [2022-11-03 02:22:55,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:55,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-11-03 02:22:55,273 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 54 [2022-11-03 02:22:55,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:22:55,274 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-11-03 02:22:55,274 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.2790697674418605) internal successors, (98), 43 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:22:55,274 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-11-03 02:22:55,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-03 02:22:55,274 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:22:55,275 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1] [2022-11-03 02:22:55,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-03 02:22:55,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-03 02:22:55,487 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:22:55,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:22:55,487 INFO L85 PathProgramCache]: Analyzing trace with hash -920717246, now seen corresponding path program 24 times [2022-11-03 02:22:55,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:22:55,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230293252] [2022-11-03 02:22:55,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:22:55,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:22:55,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:22:56,926 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:56,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:22:56,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230293252] [2022-11-03 02:22:56,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230293252] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:22:56,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893346949] [2022-11-03 02:22:56,927 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:22:56,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:22:56,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:22:56,928 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:22:56,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-03 02:22:57,044 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:22:57,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:22:57,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-03 02:22:57,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:22:57,393 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 02:22:58,117 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:58,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:22:58,736 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:22:58,744 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:22:58,769 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:22:58,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893346949] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:22:58,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1047402113] [2022-11-03 02:22:58,770 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:22:58,771 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:22:58,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:22:58,771 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:22:58,771 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:22:58,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:58,802 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:22:58,803 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:22:58,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:58,830 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:22:58,831 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:22:58,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:58,850 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:22:58,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:58,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:22:58,902 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:22:58,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:22:58,945 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:22:59,014 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:00,206 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8715#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:00,206 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:00,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:00,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 71 [2022-11-03 02:23:00,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753737478] [2022-11-03 02:23:00,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:00,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-03 02:23:00,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:00,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-03 02:23:00,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=5450, Unknown=0, NotChecked=0, Total=5700 [2022-11-03 02:23:00,209 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 71 states, 71 states have (on average 2.056338028169014) internal successors, (146), 71 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:02,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:23:02,024 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2022-11-03 02:23:02,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-03 02:23:02,024 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.056338028169014) internal successors, (146), 71 states have internal predecessors, (146), 0 states have call successors, (0), 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 55 [2022-11-03 02:23:02,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:23:02,025 INFO L225 Difference]: With dead ends: 63 [2022-11-03 02:23:02,025 INFO L226 Difference]: Without dead ends: 61 [2022-11-03 02:23:02,026 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 105 SyntacticMatches, 14 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2996 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=391, Invalid=7981, Unknown=0, NotChecked=0, Total=8372 [2022-11-03 02:23:02,026 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 41 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 1867 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 584 SdHoareTripleChecker+Invalid, 1950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 1867 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:23:02,027 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 584 Invalid, 1950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 1867 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:23:02,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-03 02:23:02,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2022-11-03 02:23:02,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:02,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2022-11-03 02:23:02,038 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 55 [2022-11-03 02:23:02,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:23:02,038 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2022-11-03 02:23:02,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 2.056338028169014) internal successors, (146), 71 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:02,039 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2022-11-03 02:23:02,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-03 02:23:02,039 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:23:02,039 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1] [2022-11-03 02:23:02,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-03 02:23:02,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-03 02:23:02,240 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:23:02,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:23:02,241 INFO L85 PathProgramCache]: Analyzing trace with hash -1421529861, now seen corresponding path program 25 times [2022-11-03 02:23:02,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:23:02,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000604794] [2022-11-03 02:23:02,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:23:02,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:23:02,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:02,891 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:02,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:23:02,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000604794] [2022-11-03 02:23:02,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000604794] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:23:02,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862479928] [2022-11-03 02:23:02,892 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:23:02,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:02,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:23:02,893 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:23:02,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 02:23:03,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:03,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-03 02:23:03,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:23:03,548 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:03,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:23:03,917 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:03,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862479928] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:23:03,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [945340711] [2022-11-03 02:23:03,919 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:23:03,919 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:23:03,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:23:03,919 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:23:03,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:23:03,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:03,948 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:23:03,948 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:23:03,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:03,971 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:23:03,972 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:03,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:03,988 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:04,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:04,026 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:23:04,049 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:23:04,049 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:23:04,092 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:04,148 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:05,280 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9319#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:05,280 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:05,280 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:05,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2022-11-03 02:23:05,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838967817] [2022-11-03 02:23:05,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:05,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-03 02:23:05,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:05,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-03 02:23:05,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=513, Invalid=2037, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 02:23:05,282 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 46 states, 46 states have (on average 2.282608695652174) internal successors, (105), 46 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:05,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:23:05,628 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2022-11-03 02:23:05,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-03 02:23:05,629 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.282608695652174) internal successors, (105), 46 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-03 02:23:05,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:23:05,630 INFO L225 Difference]: With dead ends: 111 [2022-11-03 02:23:05,630 INFO L226 Difference]: Without dead ends: 66 [2022-11-03 02:23:05,631 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 112 SyntacticMatches, 41 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2316 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=838, Invalid=3194, Unknown=0, NotChecked=0, Total=4032 [2022-11-03 02:23:05,631 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 116 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:23:05,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 121 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:23:05,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-03 02:23:05,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 60. [2022-11-03 02:23:05,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:05,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-11-03 02:23:05,645 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 58 [2022-11-03 02:23:05,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:23:05,645 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-11-03 02:23:05,645 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.282608695652174) internal successors, (105), 46 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:05,645 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-11-03 02:23:05,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-03 02:23:05,646 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:23:05,646 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2022-11-03 02:23:05,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-03 02:23:05,850 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-03 02:23:05,851 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:23:05,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:23:05,851 INFO L85 PathProgramCache]: Analyzing trace with hash 1889298913, now seen corresponding path program 26 times [2022-11-03 02:23:05,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:23:05,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218361687] [2022-11-03 02:23:05,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:23:05,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:23:05,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:07,221 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:07,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:23:07,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218361687] [2022-11-03 02:23:07,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218361687] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:23:07,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1008368065] [2022-11-03 02:23:07,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:23:07,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:07,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:23:07,223 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:23:07,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-03 02:23:07,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-03 02:23:07,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:23:08,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-03 02:23:08,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:23:08,051 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:23:08,965 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:23:09,012 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:09,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:23:09,339 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:23:09,341 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:23:09,345 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:23:09,348 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:23:09,407 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:09,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1008368065] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:23:09,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1447706369] [2022-11-03 02:23:09,409 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:23:09,409 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:23:09,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:23:09,409 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:23:09,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:23:09,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:09,446 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:23:09,446 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:09,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:09,458 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:23:09,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:09,475 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:09,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:09,517 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:23:09,547 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:23:09,547 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:23:09,596 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:09,666 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:11,118 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9990#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:11,119 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:11,119 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:11,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 47 [2022-11-03 02:23:11,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885909105] [2022-11-03 02:23:11,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:11,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-03 02:23:11,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:11,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-03 02:23:11,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2514, Unknown=0, NotChecked=0, Total=2652 [2022-11-03 02:23:11,121 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 47 states, 47 states have (on average 2.1914893617021276) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:12,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:23:12,537 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2022-11-03 02:23:12,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-03 02:23:12,537 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.1914893617021276) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-11-03 02:23:12,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:23:12,538 INFO L225 Difference]: With dead ends: 67 [2022-11-03 02:23:12,538 INFO L226 Difference]: Without dead ends: 65 [2022-11-03 02:23:12,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 137 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=256, Invalid=4436, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 02:23:12,539 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 23 mSDsluCounter, 499 mSDsCounter, 0 mSdLazyCounter, 1668 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 1727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:23:12,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 497 Invalid, 1727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1668 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:23:12,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-03 02:23:12,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2022-11-03 02:23:12,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:12,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-11-03 02:23:12,557 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 59 [2022-11-03 02:23:12,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:23:12,557 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-11-03 02:23:12,558 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.1914893617021276) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:12,558 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-11-03 02:23:12,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-03 02:23:12,558 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:23:12,559 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1] [2022-11-03 02:23:12,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-03 02:23:12,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-03 02:23:12,783 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:23:12,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:23:12,784 INFO L85 PathProgramCache]: Analyzing trace with hash -1437703428, now seen corresponding path program 27 times [2022-11-03 02:23:12,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:23:12,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227916228] [2022-11-03 02:23:12,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:23:12,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:23:12,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:13,521 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:13,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:23:13,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227916228] [2022-11-03 02:23:13,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227916228] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:23:13,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067527445] [2022-11-03 02:23:13,522 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:23:13,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:13,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:23:13,523 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:23:13,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-03 02:23:13,687 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:23:13,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:23:13,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 02:23:13,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:23:14,421 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:14,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:23:14,871 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:14,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067527445] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:23:14,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [868780935] [2022-11-03 02:23:14,873 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:23:14,873 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:23:14,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:23:14,874 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:23:14,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:23:14,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:14,909 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:23:14,909 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:14,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:14,921 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:23:14,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:14,936 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:14,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:14,998 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:23:15,024 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:23:15,025 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:23:15,075 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:15,143 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:16,485 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10635#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:16,485 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:16,485 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:16,485 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-11-03 02:23:16,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143549269] [2022-11-03 02:23:16,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:16,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-03 02:23:16,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:16,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-03 02:23:16,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=2284, Unknown=0, NotChecked=0, Total=2862 [2022-11-03 02:23:16,487 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:16,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:23:16,888 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2022-11-03 02:23:16,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-03 02:23:16,889 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2022-11-03 02:23:16,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:23:16,889 INFO L225 Difference]: With dead ends: 118 [2022-11-03 02:23:16,889 INFO L226 Difference]: Without dead ends: 70 [2022-11-03 02:23:16,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 120 SyntacticMatches, 44 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2625 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=949, Invalid=3607, Unknown=0, NotChecked=0, Total=4556 [2022-11-03 02:23:16,891 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 148 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:23:16,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 144 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:23:16,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-03 02:23:16,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2022-11-03 02:23:16,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:16,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-11-03 02:23:16,914 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2022-11-03 02:23:16,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:23:16,914 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-11-03 02:23:16,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:16,914 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-11-03 02:23:16,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-03 02:23:16,915 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:23:16,915 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2022-11-03 02:23:16,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-03 02:23:17,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-03 02:23:17,115 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:23:17,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:23:17,116 INFO L85 PathProgramCache]: Analyzing trace with hash 1179696354, now seen corresponding path program 28 times [2022-11-03 02:23:17,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:23:17,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544736637] [2022-11-03 02:23:17,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:23:17,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:23:17,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:18,559 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:18,559 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:23:18,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544736637] [2022-11-03 02:23:18,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [544736637] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:23:18,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590021065] [2022-11-03 02:23:18,559 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:23:18,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:18,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:23:18,560 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:23:18,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-03 02:23:18,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:18,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-03 02:23:18,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:23:18,761 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:23:19,714 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:23:19,763 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:19,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:23:20,090 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:23:20,092 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:23:20,097 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:23:20,100 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:23:20,162 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:20,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590021065] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:23:20,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1105307035] [2022-11-03 02:23:20,164 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:23:20,164 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:23:20,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:23:20,165 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:23:20,165 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:23:20,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:20,200 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:23:20,200 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:20,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:20,210 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:23:20,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:20,232 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:23:20,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:20,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:20,287 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:23:20,287 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:23:20,326 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:20,383 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:21,899 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11351#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:21,899 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:21,899 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:21,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 50 [2022-11-03 02:23:21,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046682600] [2022-11-03 02:23:21,900 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:21,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-03 02:23:21,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:21,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-03 02:23:21,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2824, Unknown=0, NotChecked=0, Total=2970 [2022-11-03 02:23:21,901 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 50 states, 50 states have (on average 2.2) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:23,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:23:23,490 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2022-11-03 02:23:23,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-03 02:23:23,491 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.2) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2022-11-03 02:23:23,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:23:23,491 INFO L225 Difference]: With dead ends: 71 [2022-11-03 02:23:23,491 INFO L226 Difference]: Without dead ends: 69 [2022-11-03 02:23:23,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 147 SyntacticMatches, 21 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 978 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=271, Invalid=4985, Unknown=0, NotChecked=0, Total=5256 [2022-11-03 02:23:23,493 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 24 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 1954 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 591 SdHoareTripleChecker+Invalid, 2017 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1954 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:23:23,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 591 Invalid, 2017 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1954 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 02:23:23,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-03 02:23:23,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2022-11-03 02:23:23,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 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) [2022-11-03 02:23:23,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2022-11-03 02:23:23,513 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 63 [2022-11-03 02:23:23,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:23:23,513 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2022-11-03 02:23:23,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.2) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:23,514 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2022-11-03 02:23:23,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-03 02:23:23,514 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:23:23,514 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2022-11-03 02:23:23,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-03 02:23:23,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:23,715 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:23:23,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:23:23,715 INFO L85 PathProgramCache]: Analyzing trace with hash -1378507685, now seen corresponding path program 29 times [2022-11-03 02:23:23,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:23:23,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889692006] [2022-11-03 02:23:23,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:23:23,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:23:23,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:24,491 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:24,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:23:24,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889692006] [2022-11-03 02:23:24,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889692006] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:23:24,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903051433] [2022-11-03 02:23:24,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:23:24,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:24,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:23:24,493 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:23:24,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-03 02:23:25,648 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-03 02:23:25,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:23:25,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-03 02:23:25,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:23:26,265 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:26,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:23:26,714 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:26,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903051433] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:23:26,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [306787046] [2022-11-03 02:23:26,716 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:23:26,716 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:23:26,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:23:26,716 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:23:26,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:23:26,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:26,739 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:23:26,739 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:23:26,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:26,762 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:23:26,762 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:26,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:26,785 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:23:26,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:26,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:26,842 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:23:26,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:23:26,890 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:26,937 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:27,937 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12037#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:27,937 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:27,937 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:27,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-11-03 02:23:27,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853784932] [2022-11-03 02:23:27,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:27,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-03 02:23:27,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:27,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-03 02:23:27,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=2545, Unknown=0, NotChecked=0, Total=3192 [2022-11-03 02:23:27,939 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:28,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:23:28,378 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2022-11-03 02:23:28,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-03 02:23:28,379 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 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 66 [2022-11-03 02:23:28,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:23:28,380 INFO L225 Difference]: With dead ends: 125 [2022-11-03 02:23:28,380 INFO L226 Difference]: Without dead ends: 74 [2022-11-03 02:23:28,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 128 SyntacticMatches, 47 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2953 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1067, Invalid=4045, Unknown=0, NotChecked=0, Total=5112 [2022-11-03 02:23:28,381 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 136 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:23:28,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 146 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:23:28,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-03 02:23:28,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2022-11-03 02:23:28,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:28,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-11-03 02:23:28,404 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 66 [2022-11-03 02:23:28,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:23:28,404 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-11-03 02:23:28,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:28,405 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-11-03 02:23:28,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-03 02:23:28,405 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:23:28,406 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2022-11-03 02:23:28,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-03 02:23:28,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:28,607 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:23:28,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:23:28,607 INFO L85 PathProgramCache]: Analyzing trace with hash 1806474049, now seen corresponding path program 30 times [2022-11-03 02:23:28,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:23:28,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641563212] [2022-11-03 02:23:28,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:23:28,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:23:28,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:30,047 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:30,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:23:30,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641563212] [2022-11-03 02:23:30,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641563212] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:23:30,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201993800] [2022-11-03 02:23:30,047 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:23:30,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:30,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:23:30,049 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:23:30,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-03 02:23:30,210 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:23:30,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:23:30,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-03 02:23:30,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:23:30,277 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:23:31,335 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:23:31,402 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:31,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:23:31,801 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:23:31,803 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:23:31,809 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:23:31,811 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:23:31,885 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:31,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201993800] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:23:31,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1943004189] [2022-11-03 02:23:31,890 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:23:31,891 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:23:31,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:23:31,891 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:23:31,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:23:31,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:31,916 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:23:31,916 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:23:31,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:31,941 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:23:31,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:31,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:31,957 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:32,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:32,009 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:23:32,036 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:23:32,037 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:23:32,089 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:32,151 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:33,776 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12798#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:33,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:33,776 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:33,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 53 [2022-11-03 02:23:33,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801646577] [2022-11-03 02:23:33,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:33,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-03 02:23:33,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:33,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-03 02:23:33,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=3152, Unknown=0, NotChecked=0, Total=3306 [2022-11-03 02:23:33,778 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 53 states, 53 states have (on average 2.207547169811321) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:35,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:23:35,511 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2022-11-03 02:23:35,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-03 02:23:35,511 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.207547169811321) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2022-11-03 02:23:35,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:23:35,512 INFO L225 Difference]: With dead ends: 75 [2022-11-03 02:23:35,512 INFO L226 Difference]: Without dead ends: 73 [2022-11-03 02:23:35,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 157 SyntacticMatches, 22 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1090 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=286, Invalid=5566, Unknown=0, NotChecked=0, Total=5852 [2022-11-03 02:23:35,513 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 25 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 2059 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 615 SdHoareTripleChecker+Invalid, 2126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2059 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:23:35,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 615 Invalid, 2126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2059 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 02:23:35,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-03 02:23:35,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-11-03 02:23:35,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:35,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2022-11-03 02:23:35,532 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 67 [2022-11-03 02:23:35,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:23:35,533 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2022-11-03 02:23:35,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.207547169811321) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:35,533 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2022-11-03 02:23:35,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-03 02:23:35,534 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:23:35,534 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1] [2022-11-03 02:23:35,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-03 02:23:35,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:35,735 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:23:35,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:23:35,736 INFO L85 PathProgramCache]: Analyzing trace with hash 732968348, now seen corresponding path program 31 times [2022-11-03 02:23:35,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:23:35,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379315123] [2022-11-03 02:23:35,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:23:35,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:23:35,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:36,508 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:36,509 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:23:36,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379315123] [2022-11-03 02:23:36,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379315123] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:23:36,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978733924] [2022-11-03 02:23:36,509 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:23:36,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:36,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:23:36,510 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:23:36,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-03 02:23:36,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:36,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 02:23:36,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:23:37,367 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:37,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:23:37,891 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:37,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978733924] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:23:37,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1198150565] [2022-11-03 02:23:37,893 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:23:37,893 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:23:37,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:23:37,893 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:23:37,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:23:37,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:37,922 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:23:37,923 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:37,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:37,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:23:37,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:37,952 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:23:37,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:37,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:37,999 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:23:37,999 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:23:38,037 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:38,078 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:39,173 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13525#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:39,173 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:39,173 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:39,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-11-03 02:23:39,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623233031] [2022-11-03 02:23:39,174 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:39,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-03 02:23:39,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:39,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-03 02:23:39,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=2820, Unknown=0, NotChecked=0, Total=3540 [2022-11-03 02:23:39,175 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:39,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:23:39,665 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2022-11-03 02:23:39,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-03 02:23:39,665 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 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 70 [2022-11-03 02:23:39,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:23:39,666 INFO L225 Difference]: With dead ends: 132 [2022-11-03 02:23:39,666 INFO L226 Difference]: Without dead ends: 78 [2022-11-03 02:23:39,667 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 136 SyntacticMatches, 50 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3300 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1192, Invalid=4508, Unknown=0, NotChecked=0, Total=5700 [2022-11-03 02:23:39,668 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 148 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:23:39,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 146 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:23:39,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-11-03 02:23:39,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2022-11-03 02:23:39,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:39,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-11-03 02:23:39,685 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 70 [2022-11-03 02:23:39,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:23:39,685 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-11-03 02:23:39,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:23:39,686 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-11-03 02:23:39,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-03 02:23:39,686 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:23:39,686 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2022-11-03 02:23:39,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-03 02:23:39,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-03 02:23:39,887 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:23:39,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:23:39,887 INFO L85 PathProgramCache]: Analyzing trace with hash -1513797246, now seen corresponding path program 32 times [2022-11-03 02:23:39,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:23:39,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800261387] [2022-11-03 02:23:39,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:23:39,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:23:39,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:23:41,564 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:41,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:23:41,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800261387] [2022-11-03 02:23:41,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800261387] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:23:41,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1155102306] [2022-11-03 02:23:41,564 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:23:41,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:23:41,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:23:41,565 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:23:41,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-03 02:23:43,912 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-11-03 02:23:43,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:23:43,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 103 conjunts are in the unsatisfiable core [2022-11-03 02:23:43,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:23:43,978 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:44,044 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 32 [2022-11-03 02:23:44,130 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:23:44,130 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 46 [2022-11-03 02:23:47,467 INFO L356 Elim1Store]: treesize reduction 58, result has 4.9 percent of original size [2022-11-03 02:23:47,468 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 77 treesize of output 36 [2022-11-03 02:23:47,548 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:47,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:23:50,496 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 148 treesize of output 140 [2022-11-03 02:23:50,511 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:23:50,512 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 3466 treesize of output 3370 [2022-11-03 02:23:52,224 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:23:52,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1155102306] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:23:52,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [733501722] [2022-11-03 02:23:52,226 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:23:52,226 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:23:52,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:23:52,226 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:23:52,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:23:52,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:52,262 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:23:52,262 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:23:52,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:52,273 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:23:52,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:52,290 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:23:52,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:52,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:23:52,342 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:23:52,342 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:23:52,387 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:23:52,439 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:23:55,403 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14374#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:23:55,404 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:23:55,404 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:23:55,404 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 41, 42] total 99 [2022-11-03 02:23:55,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126385167] [2022-11-03 02:23:55,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:23:55,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-11-03 02:23:55,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:23:55,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-11-03 02:23:55,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=10178, Unknown=0, NotChecked=0, Total=10712 [2022-11-03 02:23:55,407 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 99 states, 99 states have (on average 1.9393939393939394) internal successors, (192), 99 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:00,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:24:00,155 INFO L93 Difference]: Finished difference Result 176 states and 180 transitions. [2022-11-03 02:24:00,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-11-03 02:24:00,155 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.9393939393939394) internal successors, (192), 99 states have internal predecessors, (192), 0 states have call successors, (0), 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 71 [2022-11-03 02:24:00,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:24:00,165 INFO L225 Difference]: With dead ends: 176 [2022-11-03 02:24:00,165 INFO L226 Difference]: Without dead ends: 174 [2022-11-03 02:24:00,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 139 SyntacticMatches, 20 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5209 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=989, Invalid=19033, Unknown=0, NotChecked=0, Total=20022 [2022-11-03 02:24:00,167 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 23 mSDsluCounter, 801 mSDsCounter, 0 mSdLazyCounter, 1086 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 815 SdHoareTripleChecker+Invalid, 1735 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1086 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 641 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:24:00,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 815 Invalid, 1735 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1086 Invalid, 0 Unknown, 641 Unchecked, 1.0s Time] [2022-11-03 02:24:00,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-03 02:24:00,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 78. [2022-11-03 02:24:00,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.0649350649350648) internal successors, (82), 77 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:00,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2022-11-03 02:24:00,199 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 71 [2022-11-03 02:24:00,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:24:00,199 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2022-11-03 02:24:00,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.9393939393939394) internal successors, (192), 99 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:00,199 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2022-11-03 02:24:00,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-03 02:24:00,200 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:24:00,200 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1, 1] [2022-11-03 02:24:00,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-03 02:24:00,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:00,401 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:24:00,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:24:00,401 INFO L85 PathProgramCache]: Analyzing trace with hash -372354117, now seen corresponding path program 33 times [2022-11-03 02:24:00,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:24:00,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951458131] [2022-11-03 02:24:00,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:24:00,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:24:00,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:01,209 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 393 proven. 202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:01,209 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:24:01,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951458131] [2022-11-03 02:24:01,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951458131] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:24:01,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809810729] [2022-11-03 02:24:01,210 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:24:01,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:01,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:24:01,211 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:24:01,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-03 02:24:01,360 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:24:01,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:24:01,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-03 02:24:01,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:24:02,164 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:02,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:24:02,756 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:02,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809810729] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:24:02,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [902569624] [2022-11-03 02:24:02,757 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:24:02,757 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:24:02,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:24:02,758 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:24:02,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:24:02,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:02,781 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:24:02,782 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:24:02,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:02,802 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:24:02,803 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:02,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:02,818 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:02,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:02,850 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:24:02,873 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:24:02,874 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:24:02,930 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:24:02,969 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:24:03,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15328#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:24:03,380 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:24:03,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:24:03,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2022-11-03 02:24:03,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593681866] [2022-11-03 02:24:03,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:24:03,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-03 02:24:03,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:24:03,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-03 02:24:03,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=797, Invalid=3109, Unknown=0, NotChecked=0, Total=3906 [2022-11-03 02:24:03,382 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:03,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:24:03,958 INFO L93 Difference]: Finished difference Result 193 states and 197 transitions. [2022-11-03 02:24:03,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-03 02:24:03,959 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 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 74 [2022-11-03 02:24:03,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:24:03,960 INFO L225 Difference]: With dead ends: 193 [2022-11-03 02:24:03,960 INFO L226 Difference]: Without dead ends: 136 [2022-11-03 02:24:03,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 162 SyntacticMatches, 35 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2642 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1324, Invalid=4996, Unknown=0, NotChecked=0, Total=6320 [2022-11-03 02:24:03,961 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 170 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:24:03,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 154 Invalid, 422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:24:03,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-03 02:24:03,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 78. [2022-11-03 02:24:03,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.051948051948052) internal successors, (81), 77 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:03,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2022-11-03 02:24:03,985 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 74 [2022-11-03 02:24:03,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:24:03,985 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2022-11-03 02:24:03,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:03,985 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2022-11-03 02:24:03,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-03 02:24:03,986 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:24:03,986 INFO L195 NwaCegarLoop]: trace histogram [20, 17, 16, 16, 1, 1, 1, 1, 1] [2022-11-03 02:24:04,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-03 02:24:04,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-03 02:24:04,186 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:24:04,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:24:04,187 INFO L85 PathProgramCache]: Analyzing trace with hash -1840709860, now seen corresponding path program 34 times [2022-11-03 02:24:04,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:24:04,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106235963] [2022-11-03 02:24:04,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:24:04,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:24:04,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:06,399 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 1 proven. 601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:06,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:24:06,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106235963] [2022-11-03 02:24:06,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106235963] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:24:06,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793070219] [2022-11-03 02:24:06,400 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:24:06,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:06,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:24:06,402 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:24:06,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-03 02:24:06,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:06,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-03 02:24:06,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:24:06,667 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:24:06,721 INFO L356 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2022-11-03 02:24:06,721 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2022-11-03 02:24:06,742 INFO L356 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2022-11-03 02:24:06,743 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2022-11-03 02:24:06,813 INFO L356 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2022-11-03 02:24:06,813 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2022-11-03 02:24:08,053 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:24:08,109 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 3 proven. 599 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:08,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:24:08,736 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2022-11-03 02:24:08,743 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 44 [2022-11-03 02:24:08,831 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 601 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:24:08,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793070219] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:24:08,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [685996992] [2022-11-03 02:24:08,832 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:24:08,832 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:24:08,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:24:08,833 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:24:08,833 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:24:08,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:08,863 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:24:08,864 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:08,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:08,874 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:24:08,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:08,895 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:08,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:08,932 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:24:08,958 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:24:08,958 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:24:09,006 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:24:09,084 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:24:11,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16251#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:24:11,617 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:24:11,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:24:11,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 40] total 60 [2022-11-03 02:24:11,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412767027] [2022-11-03 02:24:11,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:24:11,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-03 02:24:11,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:24:11,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-03 02:24:11,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=3980, Unknown=0, NotChecked=0, Total=4160 [2022-11-03 02:24:11,619 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 60 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:16,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:24:16,712 INFO L93 Difference]: Finished difference Result 189 states and 192 transitions. [2022-11-03 02:24:16,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-03 02:24:16,713 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 60 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2022-11-03 02:24:16,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:24:16,714 INFO L225 Difference]: With dead ends: 189 [2022-11-03 02:24:16,714 INFO L226 Difference]: Without dead ends: 187 [2022-11-03 02:24:16,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 172 SyntacticMatches, 26 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=975, Invalid=17657, Unknown=0, NotChecked=0, Total=18632 [2022-11-03 02:24:16,716 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 97 mSDsluCounter, 1523 mSDsCounter, 0 mSdLazyCounter, 4135 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 1522 SdHoareTripleChecker+Invalid, 4313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 4135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:24:16,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 1522 Invalid, 4313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 4135 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-03 02:24:16,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-11-03 02:24:16,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 76. [2022-11-03 02:24:16,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 75 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:16,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2022-11-03 02:24:16,752 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2022-11-03 02:24:16,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:24:16,753 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2022-11-03 02:24:16,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 60 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:16,753 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2022-11-03 02:24:16,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-03 02:24:16,754 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:24:16,754 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2022-11-03 02:24:16,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-03 02:24:16,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-03 02:24:16,971 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:24:16,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:24:16,971 INFO L85 PathProgramCache]: Analyzing trace with hash 1774912673, now seen corresponding path program 35 times [2022-11-03 02:24:16,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:24:16,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133511872] [2022-11-03 02:24:16,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:24:16,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:24:17,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:19,035 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:19,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:24:19,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133511872] [2022-11-03 02:24:19,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133511872] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:24:19,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978539154] [2022-11-03 02:24:19,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:24:19,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:19,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:24:19,037 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:24:19,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-03 02:24:21,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-03 02:24:21,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:24:21,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-03 02:24:21,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:24:21,168 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:24:22,478 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:24:22,536 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:22,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:24:22,980 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:24:22,982 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:24:22,987 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:24:22,989 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:24:23,058 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:23,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978539154] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:24:23,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1683747522] [2022-11-03 02:24:23,059 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:24:23,060 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:24:23,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:24:23,060 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:24:23,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:24:23,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:23,085 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:24:23,085 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:24:23,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:23,108 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:24:23,109 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:23,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:23,127 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:24:23,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:23,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:23,194 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:24:23,195 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:24:23,235 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:24:23,274 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:24:25,242 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17281#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:24:25,242 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:24:25,242 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:24:25,242 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 59 [2022-11-03 02:24:25,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121325685] [2022-11-03 02:24:25,243 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:24:25,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-03 02:24:25,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:24:25,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-03 02:24:25,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3862, Unknown=0, NotChecked=0, Total=4032 [2022-11-03 02:24:25,244 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 59 states, 59 states have (on average 2.2203389830508473) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:27,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:24:27,401 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2022-11-03 02:24:27,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-03 02:24:27,401 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.2203389830508473) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2022-11-03 02:24:27,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:24:27,402 INFO L225 Difference]: With dead ends: 83 [2022-11-03 02:24:27,402 INFO L226 Difference]: Without dead ends: 81 [2022-11-03 02:24:27,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 177 SyntacticMatches, 24 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1332 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=316, Invalid=6824, Unknown=0, NotChecked=0, Total=7140 [2022-11-03 02:24:27,403 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 29 mSDsluCounter, 815 mSDsCounter, 0 mSdLazyCounter, 2644 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 815 SdHoareTripleChecker+Invalid, 2721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2644 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:24:27,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 815 Invalid, 2721 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2644 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-03 02:24:27,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-03 02:24:27,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2022-11-03 02:24:27,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:27,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2022-11-03 02:24:27,431 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2022-11-03 02:24:27,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:24:27,432 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2022-11-03 02:24:27,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.2203389830508473) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:27,432 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2022-11-03 02:24:27,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-03 02:24:27,432 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:24:27,432 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1, 1] [2022-11-03 02:24:27,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-03 02:24:27,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-03 02:24:27,633 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:24:27,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:24:27,633 INFO L85 PathProgramCache]: Analyzing trace with hash 1085853756, now seen corresponding path program 36 times [2022-11-03 02:24:27,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:24:27,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179748073] [2022-11-03 02:24:27,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:24:27,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:24:27,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:28,619 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 443 proven. 223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:28,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:24:28,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179748073] [2022-11-03 02:24:28,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179748073] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:24:28,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125299903] [2022-11-03 02:24:28,620 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:24:28,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:28,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:24:28,621 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:24:28,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-03 02:24:28,831 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:24:28,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:24:28,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-03 02:24:28,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:24:29,718 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:29,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:24:30,347 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:30,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125299903] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:24:30,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700848718] [2022-11-03 02:24:30,349 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:24:30,349 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:24:30,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:24:30,349 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:24:30,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:24:30,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:30,383 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:24:30,383 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:30,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:30,393 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:24:30,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:30,408 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:30,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:30,442 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:24:30,465 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:24:30,466 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:24:30,520 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:24:30,559 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:24:30,978 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18090#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:24:30,978 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:24:30,978 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:24:30,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2022-11-03 02:24:30,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553597494] [2022-11-03 02:24:30,979 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:24:30,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-03 02:24:30,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:24:30,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-03 02:24:30,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=878, Invalid=3412, Unknown=0, NotChecked=0, Total=4290 [2022-11-03 02:24:30,981 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:31,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:24:31,544 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2022-11-03 02:24:31,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-03 02:24:31,545 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2022-11-03 02:24:31,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:24:31,546 INFO L225 Difference]: With dead ends: 146 [2022-11-03 02:24:31,546 INFO L226 Difference]: Without dead ends: 86 [2022-11-03 02:24:31,546 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 171 SyntacticMatches, 37 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2913 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1463, Invalid=5509, Unknown=0, NotChecked=0, Total=6972 [2022-11-03 02:24:31,547 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 268 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:24:31,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 146 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:24:31,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-03 02:24:31,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-11-03 02:24:31,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:31,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-11-03 02:24:31,575 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 78 [2022-11-03 02:24:31,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:24:31,575 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-11-03 02:24:31,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:31,575 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-11-03 02:24:31,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-03 02:24:31,575 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:24:31,576 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2022-11-03 02:24:31,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-03 02:24:31,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-03 02:24:31,776 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:24:31,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:24:31,777 INFO L85 PathProgramCache]: Analyzing trace with hash 528916002, now seen corresponding path program 37 times [2022-11-03 02:24:31,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:24:31,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37448733] [2022-11-03 02:24:31,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:24:31,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:24:31,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:33,772 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:33,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:24:33,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37448733] [2022-11-03 02:24:33,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37448733] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:24:33,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260459094] [2022-11-03 02:24:33,772 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:24:33,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:33,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:24:33,774 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:24:33,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-03 02:24:33,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:33,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-03 02:24:33,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:24:34,010 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:24:35,384 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:24:35,439 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:35,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:24:35,841 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:24:35,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:24:35,849 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:24:35,852 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:24:35,931 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:35,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260459094] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:24:35,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1831298059] [2022-11-03 02:24:35,933 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:24:35,933 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:24:35,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:24:35,933 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:24:35,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:24:35,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:35,958 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:24:35,958 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:24:35,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:35,982 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:24:35,982 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:35,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:35,998 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:24:36,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:36,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:36,049 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:24:36,049 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:24:36,104 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:24:36,162 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:24:38,277 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18986#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:24:38,278 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:24:38,278 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:24:38,278 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 62 [2022-11-03 02:24:38,278 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363014445] [2022-11-03 02:24:38,278 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:24:38,279 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-03 02:24:38,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:24:38,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-03 02:24:38,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=4244, Unknown=0, NotChecked=0, Total=4422 [2022-11-03 02:24:38,280 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 62 states, 62 states have (on average 2.225806451612903) internal successors, (138), 62 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:40,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:24:40,839 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2022-11-03 02:24:40,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-03 02:24:40,839 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.225806451612903) internal successors, (138), 62 states have internal predecessors, (138), 0 states have call successors, (0), 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 79 [2022-11-03 02:24:40,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:24:40,840 INFO L225 Difference]: With dead ends: 87 [2022-11-03 02:24:40,840 INFO L226 Difference]: Without dead ends: 85 [2022-11-03 02:24:40,841 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 187 SyntacticMatches, 25 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1462 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=331, Invalid=7501, Unknown=0, NotChecked=0, Total=7832 [2022-11-03 02:24:40,841 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 30 mSDsluCounter, 936 mSDsCounter, 0 mSdLazyCounter, 2965 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 936 SdHoareTripleChecker+Invalid, 3046 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 2965 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:24:40,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 936 Invalid, 3046 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 2965 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-03 02:24:40,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-03 02:24:40,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2022-11-03 02:24:40,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:40,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2022-11-03 02:24:40,874 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 79 [2022-11-03 02:24:40,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:24:40,874 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2022-11-03 02:24:40,875 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.225806451612903) internal successors, (138), 62 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:40,875 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2022-11-03 02:24:40,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-03 02:24:40,875 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:24:40,876 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1, 1] [2022-11-03 02:24:40,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-03 02:24:41,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-03 02:24:41,087 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:24:41,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:24:41,087 INFO L85 PathProgramCache]: Analyzing trace with hash -1293599973, now seen corresponding path program 38 times [2022-11-03 02:24:41,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:24:41,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216976502] [2022-11-03 02:24:41,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:24:41,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:24:41,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:42,101 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 496 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:42,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:24:42,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216976502] [2022-11-03 02:24:42,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216976502] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:24:42,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896668792] [2022-11-03 02:24:42,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:24:42,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:42,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:24:42,103 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:24:42,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-03 02:24:44,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-11-03 02:24:44,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:24:44,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-03 02:24:44,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:24:45,177 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:45,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:24:45,871 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:45,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896668792] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:24:45,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1146677218] [2022-11-03 02:24:45,872 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:24:45,872 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:24:45,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:24:45,873 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:24:45,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:24:45,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:45,902 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:24:45,902 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:24:45,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:45,927 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:24:45,928 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:45,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:45,945 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:24:45,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:45,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:45,997 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:24:45,997 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:24:46,035 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:24:46,075 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:24:47,414 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19836#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:24:47,415 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:24:47,415 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:24:47,415 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 64 [2022-11-03 02:24:47,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929907696] [2022-11-03 02:24:47,416 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:24:47,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-03 02:24:47,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:24:47,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-03 02:24:47,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=963, Invalid=3729, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 02:24:47,417 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:48,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:24:48,082 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2022-11-03 02:24:48,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-03 02:24:48,082 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 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 82 [2022-11-03 02:24:48,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:24:48,083 INFO L225 Difference]: With dead ends: 153 [2022-11-03 02:24:48,083 INFO L226 Difference]: Without dead ends: 90 [2022-11-03 02:24:48,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 160 SyntacticMatches, 59 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4455 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1609, Invalid=6047, Unknown=0, NotChecked=0, Total=7656 [2022-11-03 02:24:48,084 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 232 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:24:48,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 175 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:24:48,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-03 02:24:48,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2022-11-03 02:24:48,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:48,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2022-11-03 02:24:48,115 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 82 [2022-11-03 02:24:48,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:24:48,115 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2022-11-03 02:24:48,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:48,116 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2022-11-03 02:24:48,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-03 02:24:48,116 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:24:48,117 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2022-11-03 02:24:48,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-03 02:24:48,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-03 02:24:48,324 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:24:48,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:24:48,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1196579327, now seen corresponding path program 39 times [2022-11-03 02:24:48,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:24:48,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265484121] [2022-11-03 02:24:48,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:24:48,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:24:48,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:50,556 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:50,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:24:50,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265484121] [2022-11-03 02:24:50,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265484121] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:24:50,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107635574] [2022-11-03 02:24:50,556 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:24:50,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:50,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:24:50,557 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:24:50,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-03 02:24:50,745 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:24:50,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:24:50,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 89 conjunts are in the unsatisfiable core [2022-11-03 02:24:50,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:24:50,829 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:24:52,460 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:24:52,534 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:52,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:24:53,000 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:24:53,002 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:24:53,008 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:24:53,016 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:24:53,113 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:53,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107635574] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:24:53,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1406125755] [2022-11-03 02:24:53,115 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:24:53,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:24:53,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:24:53,116 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:24:53,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:24:53,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:53,148 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:24:53,149 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:24:53,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:53,174 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:24:53,174 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:24:53,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:53,191 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:24:53,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:53,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:24:53,242 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:24:53,242 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:24:53,283 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:24:53,331 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:24:55,566 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20777#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:24:55,567 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:24:55,567 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:24:55,567 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 65 [2022-11-03 02:24:55,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543195063] [2022-11-03 02:24:55,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:24:55,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-03 02:24:55,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:24:55,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-03 02:24:55,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4644, Unknown=0, NotChecked=0, Total=4830 [2022-11-03 02:24:55,569 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 65 states, 65 states have (on average 2.230769230769231) internal successors, (145), 65 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:58,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:24:58,202 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2022-11-03 02:24:58,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-11-03 02:24:58,202 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.230769230769231) internal successors, (145), 65 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2022-11-03 02:24:58,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:24:58,203 INFO L225 Difference]: With dead ends: 91 [2022-11-03 02:24:58,203 INFO L226 Difference]: Without dead ends: 89 [2022-11-03 02:24:58,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 197 SyntacticMatches, 26 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1598 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=346, Invalid=8210, Unknown=0, NotChecked=0, Total=8556 [2022-11-03 02:24:58,204 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 30 mSDsluCounter, 1026 mSDsCounter, 0 mSdLazyCounter, 3196 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 1026 SdHoareTripleChecker+Invalid, 3280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 3196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:24:58,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 1026 Invalid, 3280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 3196 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-03 02:24:58,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-03 02:24:58,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2022-11-03 02:24:58,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:58,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2022-11-03 02:24:58,237 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 83 [2022-11-03 02:24:58,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:24:58,238 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2022-11-03 02:24:58,238 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.230769230769231) internal successors, (145), 65 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:24:58,238 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2022-11-03 02:24:58,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-11-03 02:24:58,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:24:58,239 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1, 1] [2022-11-03 02:24:58,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-03 02:24:58,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2022-11-03 02:24:58,452 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:24:58,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:24:58,452 INFO L85 PathProgramCache]: Analyzing trace with hash 938619612, now seen corresponding path program 40 times [2022-11-03 02:24:58,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:24:58,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887979035] [2022-11-03 02:24:58,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:24:58,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:24:58,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:59,535 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 552 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:24:59,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:24:59,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887979035] [2022-11-03 02:24:59,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887979035] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:24:59,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989220083] [2022-11-03 02:24:59,535 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:24:59,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:24:59,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:24:59,537 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:24:59,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-03 02:24:59,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:24:59,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-03 02:24:59,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:00,725 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:00,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:01,546 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:01,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989220083] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:01,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2081007677] [2022-11-03 02:25:01,547 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:25:01,547 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:01,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:01,547 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:01,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:01,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:01,572 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:25:01,572 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:01,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:01,580 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:25:01,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:01,594 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:01,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:01,629 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:25:01,651 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:25:01,651 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:25:01,697 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:25:01,755 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:03,678 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21668#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:03,679 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:03,679 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:03,679 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2022-11-03 02:25:03,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864475] [2022-11-03 02:25:03,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:03,680 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-03 02:25:03,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:03,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-03 02:25:03,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1052, Invalid=4060, Unknown=0, NotChecked=0, Total=5112 [2022-11-03 02:25:03,681 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:04,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:04,334 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2022-11-03 02:25:04,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-03 02:25:04,334 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 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 86 [2022-11-03 02:25:04,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:04,335 INFO L225 Difference]: With dead ends: 160 [2022-11-03 02:25:04,335 INFO L226 Difference]: Without dead ends: 94 [2022-11-03 02:25:04,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 168 SyntacticMatches, 62 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4878 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1762, Invalid=6610, Unknown=0, NotChecked=0, Total=8372 [2022-11-03 02:25:04,336 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 232 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:04,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 156 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:25:04,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-03 02:25:04,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-03 02:25:04,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:04,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-11-03 02:25:04,379 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2022-11-03 02:25:04,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:04,379 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-11-03 02:25:04,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:04,380 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-11-03 02:25:04,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-03 02:25:04,380 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:04,380 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2022-11-03 02:25:04,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:04,581 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:04,581 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:04,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:04,582 INFO L85 PathProgramCache]: Analyzing trace with hash -65094974, now seen corresponding path program 41 times [2022-11-03 02:25:04,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:04,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423372406] [2022-11-03 02:25:04,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:04,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:04,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:06,652 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:06,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:06,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423372406] [2022-11-03 02:25:06,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423372406] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:06,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625371070] [2022-11-03 02:25:06,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:25:06,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:06,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:06,654 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:06,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-03 02:25:10,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-11-03 02:25:10,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:25:10,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-03 02:25:10,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:10,677 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:25:12,613 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:25:12,683 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:12,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:13,199 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:25:13,201 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:25:13,208 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:25:13,211 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:25:13,304 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:13,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625371070] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:13,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [283937503] [2022-11-03 02:25:13,306 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:25:13,306 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:13,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:13,306 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:13,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:13,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:13,334 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:25:13,334 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:25:13,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:13,359 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:25:13,360 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:13,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:13,380 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:13,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:13,416 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:25:13,444 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:25:13,445 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:25:13,510 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:25:13,566 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:17,081 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22654#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:17,081 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:17,081 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:17,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 68 [2022-11-03 02:25:17,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568007975] [2022-11-03 02:25:17,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:17,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-11-03 02:25:17,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:17,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-11-03 02:25:17,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=5062, Unknown=0, NotChecked=0, Total=5256 [2022-11-03 02:25:17,083 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 68 states, 68 states have (on average 2.235294117647059) internal successors, (152), 68 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:19,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:19,997 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2022-11-03 02:25:19,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-03 02:25:19,998 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.235294117647059) internal successors, (152), 68 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2022-11-03 02:25:19,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:19,998 INFO L225 Difference]: With dead ends: 95 [2022-11-03 02:25:19,998 INFO L226 Difference]: Without dead ends: 93 [2022-11-03 02:25:19,999 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 207 SyntacticMatches, 27 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1740 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=361, Invalid=8951, Unknown=0, NotChecked=0, Total=9312 [2022-11-03 02:25:19,999 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 29 mSDsluCounter, 1228 mSDsCounter, 0 mSdLazyCounter, 3927 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 1226 SdHoareTripleChecker+Invalid, 4013 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 3927 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:20,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 1226 Invalid, 4013 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 3927 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-03 02:25:20,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-03 02:25:20,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2022-11-03 02:25:20,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:20,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2022-11-03 02:25:20,053 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 87 [2022-11-03 02:25:20,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:20,053 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2022-11-03 02:25:20,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.235294117647059) internal successors, (152), 68 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:20,054 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2022-11-03 02:25:20,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-03 02:25:20,054 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:20,054 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1, 1] [2022-11-03 02:25:20,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:20,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:20,271 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:20,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:20,271 INFO L85 PathProgramCache]: Analyzing trace with hash 2085640827, now seen corresponding path program 42 times [2022-11-03 02:25:20,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:20,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009338775] [2022-11-03 02:25:20,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:20,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:20,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:21,258 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 611 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:21,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:21,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009338775] [2022-11-03 02:25:21,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009338775] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:21,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2147373860] [2022-11-03 02:25:21,259 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:25:21,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:21,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:21,260 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:21,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-03 02:25:21,454 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:25:21,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:25:21,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-03 02:25:21,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:22,511 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:22,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:23,279 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:23,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2147373860] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:23,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1736914045] [2022-11-03 02:25:23,281 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:25:23,281 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:23,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:23,282 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:23,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:23,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:23,303 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:25:23,303 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:25:23,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:23,324 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:25:23,324 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:23,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:23,341 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:25:23,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:23,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:23,388 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:25:23,389 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:25:23,430 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:25:23,483 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:25,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23586#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:25,004 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:25,004 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:25,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 70 [2022-11-03 02:25:25,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443773009] [2022-11-03 02:25:25,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:25,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-03 02:25:25,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:25,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-03 02:25:25,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1145, Invalid=4405, Unknown=0, NotChecked=0, Total=5550 [2022-11-03 02:25:25,006 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:25,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:25,755 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2022-11-03 02:25:25,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-03 02:25:25,756 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 0 states have call successors, (0), 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 90 [2022-11-03 02:25:25,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:25,757 INFO L225 Difference]: With dead ends: 167 [2022-11-03 02:25:25,757 INFO L226 Difference]: Without dead ends: 98 [2022-11-03 02:25:25,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 176 SyntacticMatches, 65 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5320 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1922, Invalid=7198, Unknown=0, NotChecked=0, Total=9120 [2022-11-03 02:25:25,760 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 244 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:25,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 201 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:25:25,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-03 02:25:25,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 92. [2022-11-03 02:25:25,812 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) [2022-11-03 02:25:25,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-11-03 02:25:25,813 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 90 [2022-11-03 02:25:25,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:25,813 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-11-03 02:25:25,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:25,813 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-11-03 02:25:25,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-03 02:25:25,814 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:25,814 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1] [2022-11-03 02:25:25,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:26,030 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-03 02:25:26,031 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:26,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:26,031 INFO L85 PathProgramCache]: Analyzing trace with hash -980779167, now seen corresponding path program 43 times [2022-11-03 02:25:26,031 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:26,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767623205] [2022-11-03 02:25:26,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:26,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:26,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:28,395 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:28,395 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:28,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767623205] [2022-11-03 02:25:28,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767623205] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:28,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850158121] [2022-11-03 02:25:28,396 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:25:28,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:28,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:28,397 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:28,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-03 02:25:28,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:28,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-03 02:25:28,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:28,678 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:25:30,440 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:25:30,502 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:30,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:30,956 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:25:30,958 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:25:30,964 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:25:30,966 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:25:31,051 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:31,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850158121] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:31,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1783855670] [2022-11-03 02:25:31,053 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:25:31,053 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:31,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:31,053 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:31,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:31,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:31,077 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:25:31,078 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:31,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:31,086 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:25:31,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:31,101 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:25:31,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:31,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:31,157 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:25:31,158 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:25:31,195 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:25:31,234 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:33,782 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24617#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:33,782 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:33,783 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:33,783 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 71 [2022-11-03 02:25:33,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797539704] [2022-11-03 02:25:33,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:33,783 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-03 02:25:33,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:33,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-03 02:25:33,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=5498, Unknown=0, NotChecked=0, Total=5700 [2022-11-03 02:25:33,785 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 71 states, 71 states have (on average 2.23943661971831) internal successors, (159), 71 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:36,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:36,920 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2022-11-03 02:25:36,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-03 02:25:36,920 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.23943661971831) internal successors, (159), 71 states have internal predecessors, (159), 0 states have call successors, (0), 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 [2022-11-03 02:25:36,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:36,921 INFO L225 Difference]: With dead ends: 99 [2022-11-03 02:25:36,921 INFO L226 Difference]: Without dead ends: 97 [2022-11-03 02:25:36,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 217 SyntacticMatches, 28 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1888 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=376, Invalid=9724, Unknown=0, NotChecked=0, Total=10100 [2022-11-03 02:25:36,922 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 33 mSDsluCounter, 1347 mSDsCounter, 0 mSdLazyCounter, 4243 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 1347 SdHoareTripleChecker+Invalid, 4336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 4243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:36,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 1347 Invalid, 4336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 4243 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-03 02:25:36,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-03 02:25:36,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 95. [2022-11-03 02:25:36,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:36,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2022-11-03 02:25:36,966 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 91 [2022-11-03 02:25:36,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:36,966 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2022-11-03 02:25:36,966 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 2.23943661971831) internal successors, (159), 71 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:36,967 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2022-11-03 02:25:36,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-03 02:25:36,967 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:36,967 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 22, 1, 1, 1, 1, 1] [2022-11-03 02:25:36,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:37,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:37,179 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:37,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:37,179 INFO L85 PathProgramCache]: Analyzing trace with hash 275144060, now seen corresponding path program 44 times [2022-11-03 02:25:37,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:37,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778932524] [2022-11-03 02:25:37,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:37,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:37,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:38,258 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 673 proven. 317 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:38,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:38,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778932524] [2022-11-03 02:25:38,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778932524] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:38,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643041880] [2022-11-03 02:25:38,259 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:25:38,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:38,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:38,260 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:38,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-03 02:25:44,054 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-11-03 02:25:44,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:25:44,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-03 02:25:44,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:45,289 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:45,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:46,114 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:46,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643041880] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:46,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1655380288] [2022-11-03 02:25:46,116 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:25:46,116 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:46,116 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:46,116 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:46,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:46,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:46,137 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:25:46,137 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:25:46,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:46,159 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:25:46,159 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:46,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:46,183 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:46,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:46,215 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:25:46,239 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:25:46,239 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:25:46,282 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:25:46,343 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:47,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25590#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:47,939 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:47,939 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:47,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2022-11-03 02:25:47,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639368406] [2022-11-03 02:25:47,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:47,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-03 02:25:47,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:47,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-03 02:25:47,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=4764, Unknown=0, NotChecked=0, Total=6006 [2022-11-03 02:25:47,942 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 73 states, 73 states have (on average 2.3013698630136985) internal successors, (168), 73 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:48,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:48,755 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2022-11-03 02:25:48,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-03 02:25:48,756 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.3013698630136985) internal successors, (168), 73 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2022-11-03 02:25:48,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:48,756 INFO L225 Difference]: With dead ends: 174 [2022-11-03 02:25:48,757 INFO L226 Difference]: Without dead ends: 102 [2022-11-03 02:25:48,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 184 SyntacticMatches, 68 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5781 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2089, Invalid=7811, Unknown=0, NotChecked=0, Total=9900 [2022-11-03 02:25:48,758 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 328 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:48,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [328 Valid, 237 Invalid, 671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:25:48,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-11-03 02:25:48,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 96. [2022-11-03 02:25:48,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:48,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-11-03 02:25:48,813 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 94 [2022-11-03 02:25:48,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:48,813 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-11-03 02:25:48,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.3013698630136985) internal successors, (168), 73 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:48,813 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-11-03 02:25:48,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-03 02:25:48,814 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:48,814 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-11-03 02:25:48,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:49,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-03 02:25:49,043 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:49,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:49,043 INFO L85 PathProgramCache]: Analyzing trace with hash 882351970, now seen corresponding path program 45 times [2022-11-03 02:25:49,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:49,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9259065] [2022-11-03 02:25:49,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:49,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:49,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:51,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:51,477 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:51,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9259065] [2022-11-03 02:25:51,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9259065] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:51,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130238984] [2022-11-03 02:25:51,478 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:25:51,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:51,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:51,479 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:51,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-03 02:25:51,725 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:25:51,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:25:51,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-03 02:25:51,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:51,798 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:25:53,692 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:25:53,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:53,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:54,228 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:25:54,230 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:25:54,236 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:25:54,238 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:25:54,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:54,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130238984] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:54,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [619683630] [2022-11-03 02:25:54,334 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:25:54,334 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:54,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:54,334 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:54,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:54,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:54,356 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:25:54,356 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:25:54,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:54,378 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:25:54,379 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:54,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:54,396 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:25:54,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:54,427 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:25:54,451 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:25:54,451 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:25:54,493 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:25:54,547 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:57,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26666#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:57,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:57,276 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:57,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 74 [2022-11-03 02:25:57,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478808399] [2022-11-03 02:25:57,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:57,277 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-11-03 02:25:57,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:57,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-11-03 02:25:57,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=5952, Unknown=0, NotChecked=0, Total=6162 [2022-11-03 02:25:57,277 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 74 states, 74 states have (on average 2.2432432432432434) internal successors, (166), 74 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:00,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:00,513 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2022-11-03 02:26:00,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-03 02:26:00,513 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.2432432432432434) internal successors, (166), 74 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2022-11-03 02:26:00,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:00,514 INFO L225 Difference]: With dead ends: 103 [2022-11-03 02:26:00,514 INFO L226 Difference]: Without dead ends: 101 [2022-11-03 02:26:00,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 227 SyntacticMatches, 29 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2042 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=391, Invalid=10529, Unknown=0, NotChecked=0, Total=10920 [2022-11-03 02:26:00,516 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 32 mSDsluCounter, 1340 mSDsCounter, 0 mSdLazyCounter, 4277 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 1340 SdHoareTripleChecker+Invalid, 4372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 4277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:00,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 1340 Invalid, 4372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 4277 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-03 02:26:00,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-03 02:26:00,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2022-11-03 02:26:00,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:00,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2022-11-03 02:26:00,564 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 95 [2022-11-03 02:26:00,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:00,565 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2022-11-03 02:26:00,565 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.2432432432432434) internal successors, (166), 74 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:00,565 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2022-11-03 02:26:00,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-03 02:26:00,566 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:00,566 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1, 1] [2022-11-03 02:26:00,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:00,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-03 02:26:00,771 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:00,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:00,771 INFO L85 PathProgramCache]: Analyzing trace with hash 952480219, now seen corresponding path program 46 times [2022-11-03 02:26:00,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:00,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041692540] [2022-11-03 02:26:00,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:00,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:00,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:02,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 738 proven. 343 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:02,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:02,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041692540] [2022-11-03 02:26:02,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041692540] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:02,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855922450] [2022-11-03 02:26:02,080 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:26:02,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:02,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:02,081 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:02,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-03 02:26:02,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:02,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-03 02:26:02,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:03,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:03,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:04,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:04,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855922450] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:04,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1250040434] [2022-11-03 02:26:04,393 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:26:04,393 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:04,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:04,393 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:04,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:04,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:04,416 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:26:04,417 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:26:04,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:04,426 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:26:04,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:04,441 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:26:04,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:04,473 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:26:04,497 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:26:04,497 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:26:04,556 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:26:04,593 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:05,067 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27680#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:05,067 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:05,067 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:05,067 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 76 [2022-11-03 02:26:05,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672553819] [2022-11-03 02:26:05,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:05,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-11-03 02:26:05,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:05,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-11-03 02:26:05,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1343, Invalid=5137, Unknown=0, NotChecked=0, Total=6480 [2022-11-03 02:26:05,069 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:05,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:05,812 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2022-11-03 02:26:05,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-03 02:26:05,813 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 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 98 [2022-11-03 02:26:05,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:05,814 INFO L225 Difference]: With dead ends: 181 [2022-11-03 02:26:05,814 INFO L226 Difference]: Without dead ends: 106 [2022-11-03 02:26:05,815 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 216 SyntacticMatches, 47 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4463 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2263, Invalid=8449, Unknown=0, NotChecked=0, Total=10712 [2022-11-03 02:26:05,815 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 256 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:05,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 239 Invalid, 654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:26:05,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-03 02:26:05,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 100. [2022-11-03 02:26:05,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:05,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2022-11-03 02:26:05,862 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2022-11-03 02:26:05,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:05,862 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2022-11-03 02:26:05,863 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:05,863 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2022-11-03 02:26:05,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-03 02:26:05,863 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:05,864 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2022-11-03 02:26:05,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:06,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-03 02:26:06,083 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:06,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:06,083 INFO L85 PathProgramCache]: Analyzing trace with hash 2098696385, now seen corresponding path program 47 times [2022-11-03 02:26:06,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:06,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256872963] [2022-11-03 02:26:06,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:06,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:06,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:08,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:08,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:08,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256872963] [2022-11-03 02:26:08,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256872963] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:08,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021264625] [2022-11-03 02:26:08,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:26:08,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:08,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:08,798 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:08,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-03 02:26:21,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-03 02:26:21,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:26:21,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 105 conjunts are in the unsatisfiable core [2022-11-03 02:26:21,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:21,786 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:26:23,893 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:26:23,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:23,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:24,465 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:26:24,467 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:26:24,472 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:26:24,474 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:26:24,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:24,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021264625] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:24,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [810428385] [2022-11-03 02:26:24,567 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:26:24,568 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:24,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:24,568 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:24,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:24,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:24,611 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:26:24,611 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:26:24,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:24,621 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:26:24,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:24,639 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:26:24,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:24,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:24,703 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:26:24,704 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:26:24,746 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:26:24,788 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:27,725 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28801#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:27,725 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:27,725 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:27,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 77 [2022-11-03 02:26:27,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040072337] [2022-11-03 02:26:27,725 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:27,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-11-03 02:26:27,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:27,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-11-03 02:26:27,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=6424, Unknown=0, NotChecked=0, Total=6642 [2022-11-03 02:26:27,727 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 77 states, 77 states have (on average 2.2467532467532467) internal successors, (173), 77 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:31,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:31,218 INFO L93 Difference]: Finished difference Result 107 states and 108 transitions. [2022-11-03 02:26:31,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-03 02:26:31,218 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 2.2467532467532467) internal successors, (173), 77 states have internal predecessors, (173), 0 states have call successors, (0), 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 99 [2022-11-03 02:26:31,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:31,219 INFO L225 Difference]: With dead ends: 107 [2022-11-03 02:26:31,219 INFO L226 Difference]: Without dead ends: 105 [2022-11-03 02:26:31,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 237 SyntacticMatches, 30 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2202 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=406, Invalid=11366, Unknown=0, NotChecked=0, Total=11772 [2022-11-03 02:26:31,220 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 34 mSDsluCounter, 1445 mSDsCounter, 0 mSdLazyCounter, 4631 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 1445 SdHoareTripleChecker+Invalid, 4731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 4631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:31,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 1445 Invalid, 4731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 4631 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-03 02:26:31,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-03 02:26:31,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2022-11-03 02:26:31,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:31,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2022-11-03 02:26:31,283 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 99 [2022-11-03 02:26:31,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:31,283 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2022-11-03 02:26:31,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 2.2467532467532467) internal successors, (173), 77 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:31,284 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2022-11-03 02:26:31,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-11-03 02:26:31,284 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:31,285 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1, 1] [2022-11-03 02:26:31,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:31,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-03 02:26:31,499 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:31,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:31,499 INFO L85 PathProgramCache]: Analyzing trace with hash 429871132, now seen corresponding path program 48 times [2022-11-03 02:26:31,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:31,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721733151] [2022-11-03 02:26:31,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:31,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:31,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:32,811 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 806 proven. 370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:32,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:32,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721733151] [2022-11-03 02:26:32,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721733151] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:32,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273194944] [2022-11-03 02:26:32,812 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:26:32,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:32,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:32,813 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:32,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-03 02:26:33,054 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:26:33,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:26:33,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-03 02:26:33,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:34,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:34,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:35,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:35,325 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273194944] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:35,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [10996946] [2022-11-03 02:26:35,326 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:26:35,326 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:35,327 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:35,327 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:35,327 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:35,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:35,351 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:26:35,352 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:26:35,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:35,360 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:26:35,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:35,374 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:26:35,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:35,406 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:26:35,432 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:26:35,432 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:26:35,500 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:26:35,537 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:36,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29856#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:36,011 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:36,011 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:36,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2022-11-03 02:26:36,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8811234] [2022-11-03 02:26:36,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:36,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-03 02:26:36,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:36,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-03 02:26:36,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1448, Invalid=5524, Unknown=0, NotChecked=0, Total=6972 [2022-11-03 02:26:36,013 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:36,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:36,894 INFO L93 Difference]: Finished difference Result 188 states and 190 transitions. [2022-11-03 02:26:36,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-03 02:26:36,895 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 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 102 [2022-11-03 02:26:36,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:36,895 INFO L225 Difference]: With dead ends: 188 [2022-11-03 02:26:36,896 INFO L226 Difference]: Without dead ends: 110 [2022-11-03 02:26:36,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 225 SyntacticMatches, 49 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4812 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2444, Invalid=9112, Unknown=0, NotChecked=0, Total=11556 [2022-11-03 02:26:36,897 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 320 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 188 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 188 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:36,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [320 Valid, 256 Invalid, 706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [188 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:26:36,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-03 02:26:36,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 104. [2022-11-03 02:26:36,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:36,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-11-03 02:26:36,963 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 102 [2022-11-03 02:26:36,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:36,964 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-11-03 02:26:36,964 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 79 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:36,964 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-11-03 02:26:36,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-03 02:26:36,965 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:36,965 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2022-11-03 02:26:37,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:37,190 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:37,191 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:37,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:37,191 INFO L85 PathProgramCache]: Analyzing trace with hash 310070274, now seen corresponding path program 49 times [2022-11-03 02:26:37,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:37,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60896085] [2022-11-03 02:26:37,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:37,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:37,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:39,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:39,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:39,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60896085] [2022-11-03 02:26:39,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60896085] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:39,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623334140] [2022-11-03 02:26:39,870 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:26:39,870 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:39,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:39,874 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:39,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-03 02:26:40,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:40,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 109 conjunts are in the unsatisfiable core [2022-11-03 02:26:40,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:40,232 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:26:42,480 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:26:42,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:42,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:43,070 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:26:43,071 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:26:43,077 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:26:43,079 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:26:43,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:43,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623334140] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:43,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1176001456] [2022-11-03 02:26:43,202 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:26:43,202 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:43,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:43,203 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:43,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:43,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:43,233 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:26:43,233 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:26:43,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:43,243 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:26:43,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:43,260 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:26:43,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:43,305 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:26:43,331 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:26:43,331 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:26:43,396 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:26:43,435 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:44,181 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31022#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:44,181 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:44,181 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:44,181 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 80 [2022-11-03 02:26:44,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832190179] [2022-11-03 02:26:44,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:44,182 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-03 02:26:44,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:44,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-03 02:26:44,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=6914, Unknown=0, NotChecked=0, Total=7140 [2022-11-03 02:26:44,183 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 80 states, 80 states have (on average 2.25) internal successors, (180), 80 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:47,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:47,968 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2022-11-03 02:26:47,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-11-03 02:26:47,968 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.25) internal successors, (180), 80 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2022-11-03 02:26:47,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:47,969 INFO L225 Difference]: With dead ends: 111 [2022-11-03 02:26:47,969 INFO L226 Difference]: Without dead ends: 109 [2022-11-03 02:26:47,970 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 272 SyntacticMatches, 6 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1621 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=421, Invalid=12235, Unknown=0, NotChecked=0, Total=12656 [2022-11-03 02:26:47,971 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 35 mSDsluCounter, 1559 mSDsCounter, 0 mSdLazyCounter, 4870 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 1557 SdHoareTripleChecker+Invalid, 4974 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 4870 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:47,971 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 1557 Invalid, 4974 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 4870 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-03 02:26:47,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-03 02:26:48,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2022-11-03 02:26:48,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:48,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2022-11-03 02:26:48,038 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 103 [2022-11-03 02:26:48,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:48,038 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2022-11-03 02:26:48,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.25) internal successors, (180), 80 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:48,039 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2022-11-03 02:26:48,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-03 02:26:48,039 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:48,040 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1, 1] [2022-11-03 02:26:48,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:48,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2022-11-03 02:26:48,267 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:48,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:48,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1166327493, now seen corresponding path program 50 times [2022-11-03 02:26:48,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:48,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257384580] [2022-11-03 02:26:48,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:48,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:48,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:49,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 877 proven. 398 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:26:49,771 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:49,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257384580] [2022-11-03 02:26:49,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [257384580] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:49,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878593253] [2022-11-03 02:26:49,771 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:26:49,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:49,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:49,773 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:49,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-03 02:27:00,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-11-03 02:27:00,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:27:01,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-03 02:27:01,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:02,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:02,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:03,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:03,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878593253] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:03,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2058171346] [2022-11-03 02:27:03,450 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:27:03,451 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:03,451 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:03,451 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:03,451 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:03,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:03,475 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:27:03,475 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:27:03,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:03,483 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:27:03,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:03,497 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:27:03,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:03,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:03,555 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:27:03,555 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:27:03,593 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:27:03,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:05,546 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32118#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:05,546 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:05,546 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:05,546 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 82 [2022-11-03 02:27:05,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622025810] [2022-11-03 02:27:05,546 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:05,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-11-03 02:27:05,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:05,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-11-03 02:27:05,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=5925, Unknown=0, NotChecked=0, Total=7482 [2022-11-03 02:27:05,548 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:06,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:06,359 INFO L93 Difference]: Finished difference Result 195 states and 197 transitions. [2022-11-03 02:27:06,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-03 02:27:06,359 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2022-11-03 02:27:06,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:06,361 INFO L225 Difference]: With dead ends: 195 [2022-11-03 02:27:06,361 INFO L226 Difference]: Without dead ends: 114 [2022-11-03 02:27:06,362 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 208 SyntacticMatches, 77 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7278 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2632, Invalid=9800, Unknown=0, NotChecked=0, Total=12432 [2022-11-03 02:27:06,362 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 244 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:06,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 231 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:27:06,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-11-03 02:27:06,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2022-11-03 02:27:06,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 107 states have (on average 1.0186915887850467) internal successors, (109), 107 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:06,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2022-11-03 02:27:06,406 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 106 [2022-11-03 02:27:06,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:06,407 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2022-11-03 02:27:06,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:06,413 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2022-11-03 02:27:06,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-03 02:27:06,413 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:06,414 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2022-11-03 02:27:06,444 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:06,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-11-03 02:27:06,614 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:27:06,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:06,615 INFO L85 PathProgramCache]: Analyzing trace with hash -1416963551, now seen corresponding path program 51 times [2022-11-03 02:27:06,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:06,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550633077] [2022-11-03 02:27:06,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:06,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:06,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:09,301 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:09,301 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:09,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550633077] [2022-11-03 02:27:09,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550633077] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:09,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371687029] [2022-11-03 02:27:09,302 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:27:09,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:09,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:09,303 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:09,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-03 02:27:09,577 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:27:09,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:27:09,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 113 conjunts are in the unsatisfiable core [2022-11-03 02:27:09,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:09,677 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:27:12,042 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:27:12,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:12,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:12,646 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:27:12,650 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:27:12,661 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:27:12,664 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:27:12,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:12,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371687029] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:12,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165461966] [2022-11-03 02:27:12,793 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:27:12,793 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:12,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:12,794 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:12,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:12,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:12,823 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:27:12,823 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:27:12,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:12,834 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:27:12,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:12,851 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:27:12,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:12,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:12,902 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:27:12,904 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:27:12,957 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:27:13,015 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:16,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33329#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:16,360 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:16,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:16,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 83 [2022-11-03 02:27:16,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381380499] [2022-11-03 02:27:16,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:16,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-11-03 02:27:16,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:16,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-11-03 02:27:16,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=7422, Unknown=0, NotChecked=0, Total=7656 [2022-11-03 02:27:16,362 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand has 83 states, 83 states have (on average 2.253012048192771) internal successors, (187), 83 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:20,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:20,212 INFO L93 Difference]: Finished difference Result 115 states and 116 transitions. [2022-11-03 02:27:20,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-11-03 02:27:20,212 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.253012048192771) internal successors, (187), 83 states have internal predecessors, (187), 0 states have call successors, (0), 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 107 [2022-11-03 02:27:20,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:20,213 INFO L225 Difference]: With dead ends: 115 [2022-11-03 02:27:20,213 INFO L226 Difference]: Without dead ends: 113 [2022-11-03 02:27:20,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 257 SyntacticMatches, 32 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2540 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=436, Invalid=13136, Unknown=0, NotChecked=0, Total=13572 [2022-11-03 02:27:20,215 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 37 mSDsluCounter, 1643 mSDsCounter, 0 mSdLazyCounter, 5000 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 1643 SdHoareTripleChecker+Invalid, 5109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 5000 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:20,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 1643 Invalid, 5109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 5000 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-03 02:27:20,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-03 02:27:20,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 111. [2022-11-03 02:27:20,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:20,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2022-11-03 02:27:20,258 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 107 [2022-11-03 02:27:20,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:20,258 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2022-11-03 02:27:20,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.253012048192771) internal successors, (187), 83 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:20,258 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2022-11-03 02:27:20,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-03 02:27:20,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:20,259 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 26, 26, 1, 1, 1, 1, 1] [2022-11-03 02:27:20,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:20,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:20,459 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:27:20,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:20,460 INFO L85 PathProgramCache]: Analyzing trace with hash -1817769284, now seen corresponding path program 52 times [2022-11-03 02:27:20,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:20,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575383036] [2022-11-03 02:27:20,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:20,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:20,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:21,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 951 proven. 427 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:21,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:21,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575383036] [2022-11-03 02:27:21,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575383036] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:21,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33546614] [2022-11-03 02:27:21,904 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:27:21,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:21,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:21,905 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:21,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-03 02:27:22,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:22,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-03 02:27:22,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:23,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:23,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:24,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:24,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33546614] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:24,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878809275] [2022-11-03 02:27:24,783 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:27:24,783 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:24,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:24,783 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:24,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:24,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:24,803 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:27:24,804 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:27:24,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:24,827 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:27:24,827 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:27:24,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:24,851 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:27:24,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:24,886 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:27:24,910 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:27:24,911 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:27:24,956 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:27:25,007 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:27,789 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34466#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:27,789 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:27,790 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:27,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 85 [2022-11-03 02:27:27,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834188184] [2022-11-03 02:27:27,790 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:27,790 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-11-03 02:27:27,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:27,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-11-03 02:27:27,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1670, Invalid=6340, Unknown=0, NotChecked=0, Total=8010 [2022-11-03 02:27:27,791 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand has 85 states, 85 states have (on average 2.3058823529411763) internal successors, (196), 85 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:28,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:28,712 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2022-11-03 02:27:28,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-03 02:27:28,713 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 2.3058823529411763) internal successors, (196), 85 states have internal predecessors, (196), 0 states have call successors, (0), 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 110 [2022-11-03 02:27:28,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:28,714 INFO L225 Difference]: With dead ends: 202 [2022-11-03 02:27:28,714 INFO L226 Difference]: Without dead ends: 118 [2022-11-03 02:27:28,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 216 SyntacticMatches, 80 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7815 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=2827, Invalid=10513, Unknown=0, NotChecked=0, Total=13340 [2022-11-03 02:27:28,715 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 336 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:28,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 269 Invalid, 741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 545 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:27:28,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-11-03 02:27:28,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 112. [2022-11-03 02:27:28,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:28,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2022-11-03 02:27:28,768 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 110 [2022-11-03 02:27:28,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:28,768 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2022-11-03 02:27:28,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 2.3058823529411763) internal successors, (196), 85 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:28,769 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2022-11-03 02:27:28,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-03 02:27:28,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:28,769 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2022-11-03 02:27:28,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:28,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:28,991 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:27:28,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:28,991 INFO L85 PathProgramCache]: Analyzing trace with hash -808206174, now seen corresponding path program 53 times [2022-11-03 02:27:28,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:28,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027108173] [2022-11-03 02:27:28,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:28,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:29,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:31,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:31,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:31,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027108173] [2022-11-03 02:27:31,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027108173] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:31,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131887876] [2022-11-03 02:27:31,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:27:31,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:31,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:31,899 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:31,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-03 02:27:41,365 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2022-11-03 02:27:41,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:27:41,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 120 conjunts are in the unsatisfiable core [2022-11-03 02:27:41,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:43,254 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 02:27:46,533 INFO L356 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-03 02:27:46,533 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 23 [2022-11-03 02:27:46,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 1001 proven. 404 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:46,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:51,783 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2022-11-03 02:27:51,785 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2022-11-03 02:27:55,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 975 proven. 430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:27:55,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131887876] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:55,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [64287332] [2022-11-03 02:27:55,778 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:27:55,778 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:55,778 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:55,779 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:55,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:55,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:55,805 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:27:55,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:27:55,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:55,828 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:27:55,828 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:27:55,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:55,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:27:55,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:55,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:55,903 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:27:55,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:27:55,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:27:56,000 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:00,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35805#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:28:00,858 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:00,859 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:28:00,859 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 169 [2022-11-03 02:28:00,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449928951] [2022-11-03 02:28:00,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:00,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 169 states [2022-11-03 02:28:00,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:00,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 169 interpolants. [2022-11-03 02:28:00,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=27824, Unknown=0, NotChecked=0, Total=30102 [2022-11-03 02:28:00,863 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 169 states, 169 states have (on average 1.9408284023668638) internal successors, (328), 169 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:11,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:11,187 INFO L93 Difference]: Finished difference Result 202 states and 205 transitions. [2022-11-03 02:28:11,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2022-11-03 02:28:11,187 INFO L78 Accepts]: Start accepts. Automaton has has 169 states, 169 states have (on average 1.9408284023668638) internal successors, (328), 169 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2022-11-03 02:28:11,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:11,188 INFO L225 Difference]: With dead ends: 202 [2022-11-03 02:28:11,188 INFO L226 Difference]: Without dead ends: 118 [2022-11-03 02:28:11,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 189 SyntacticMatches, 28 SemanticMatches, 268 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22084 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=4565, Invalid=68065, Unknown=0, NotChecked=0, Total=72630 [2022-11-03 02:28:11,191 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 63 mSDsluCounter, 1805 mSDsCounter, 0 mSdLazyCounter, 5525 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 1832 SdHoareTripleChecker+Invalid, 6236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 5525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 501 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:11,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 1832 Invalid, 6236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 5525 Invalid, 0 Unknown, 501 Unchecked, 3.0s Time] [2022-11-03 02:28:11,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-11-03 02:28:11,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2022-11-03 02:28:11,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.017391304347826) internal successors, (117), 115 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:11,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 117 transitions. [2022-11-03 02:28:11,263 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 117 transitions. Word has length 111 [2022-11-03 02:28:11,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:11,263 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 117 transitions. [2022-11-03 02:28:11,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 169 states, 169 states have (on average 1.9408284023668638) internal successors, (328), 169 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:11,264 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 117 transitions. [2022-11-03 02:28:11,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-11-03 02:28:11,264 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:11,264 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2022-11-03 02:28:11,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:11,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-03 02:28:11,465 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:11,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:11,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1553619841, now seen corresponding path program 54 times [2022-11-03 02:28:11,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:11,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052495530] [2022-11-03 02:28:11,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:11,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:11,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:14,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:28:14,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:14,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052495530] [2022-11-03 02:28:14,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052495530] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:28:14,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479490763] [2022-11-03 02:28:14,711 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:28:14,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:14,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:14,712 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:14,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-03 02:28:14,988 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:28:14,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:28:14,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 121 conjunts are in the unsatisfiable core [2022-11-03 02:28:14,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:15,105 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:28:17,901 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:28:17,977 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:28:17,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:18,561 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:28:18,563 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:28:18,568 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:28:18,570 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:28:18,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:28:18,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479490763] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:18,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283348508] [2022-11-03 02:28:18,679 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:28:18,679 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:18,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:18,681 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:18,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:18,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:18,712 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:28:18,712 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:28:18,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:18,734 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:28:18,734 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:28:18,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:18,749 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:28:18,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:18,780 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:28:18,803 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:28:18,804 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:28:18,842 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:28:18,920 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:22,734 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37236#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:28:22,735 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:22,735 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:28:22,735 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 89 [2022-11-03 02:28:22,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800903203] [2022-11-03 02:28:22,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:22,736 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-11-03 02:28:22,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:22,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-11-03 02:28:22,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8492, Unknown=0, NotChecked=0, Total=8742 [2022-11-03 02:28:22,737 INFO L87 Difference]: Start difference. First operand 116 states and 117 transitions. Second operand has 89 states, 89 states have (on average 2.258426966292135) internal successors, (201), 89 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:27,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:27,412 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2022-11-03 02:28:27,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-11-03 02:28:27,413 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 2.258426966292135) internal successors, (201), 89 states have internal predecessors, (201), 0 states have call successors, (0), 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 115 [2022-11-03 02:28:27,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:27,415 INFO L225 Difference]: With dead ends: 123 [2022-11-03 02:28:27,415 INFO L226 Difference]: Without dead ends: 121 [2022-11-03 02:28:27,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 277 SyntacticMatches, 34 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=466, Invalid=15034, Unknown=0, NotChecked=0, Total=15500 [2022-11-03 02:28:27,417 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 36 mSDsluCounter, 1942 mSDsCounter, 0 mSdLazyCounter, 6040 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 1940 SdHoareTripleChecker+Invalid, 6154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 6040 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:27,417 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 1940 Invalid, 6154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 6040 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-11-03 02:28:27,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-11-03 02:28:27,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 119. [2022-11-03 02:28:27,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:27,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2022-11-03 02:28:27,480 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 115 [2022-11-03 02:28:27,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:27,481 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2022-11-03 02:28:27,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 2.258426966292135) internal successors, (201), 89 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:27,481 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2022-11-03 02:28:27,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-11-03 02:28:27,481 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:27,481 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1, 1] [2022-11-03 02:28:27,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:27,682 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:27,682 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:27,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:27,682 INFO L85 PathProgramCache]: Analyzing trace with hash 1325895004, now seen corresponding path program 55 times [2022-11-03 02:28:27,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:27,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559702937] [2022-11-03 02:28:27,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:27,683 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:27,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:29,369 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1108 proven. 488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:28:29,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:29,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559702937] [2022-11-03 02:28:29,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559702937] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:28:29,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342969927] [2022-11-03 02:28:29,370 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:28:29,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:29,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:29,371 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:29,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-03 02:28:29,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:29,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-03 02:28:29,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:31,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:28:31,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:32,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:28:32,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342969927] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:32,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [905324402] [2022-11-03 02:28:32,621 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:28:32,622 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:32,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:32,622 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:32,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:32,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:32,654 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:28:32,655 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:28:32,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:32,665 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:28:32,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:32,683 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:28:32,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:32,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:32,744 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:28:32,744 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:28:32,790 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:28:32,836 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:35,108 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38455#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:28:35,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:35,108 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:28:35,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2022-11-03 02:28:35,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100632254] [2022-11-03 02:28:35,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:35,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-11-03 02:28:35,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:35,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-11-03 02:28:35,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1908, Invalid=7212, Unknown=0, NotChecked=0, Total=9120 [2022-11-03 02:28:35,111 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:36,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:36,160 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2022-11-03 02:28:36,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-03 02:28:36,160 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 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 118 [2022-11-03 02:28:36,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:36,161 INFO L225 Difference]: With dead ends: 216 [2022-11-03 02:28:36,161 INFO L226 Difference]: Without dead ends: 126 [2022-11-03 02:28:36,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 232 SyntacticMatches, 86 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8946 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=3238, Invalid=12014, Unknown=0, NotChecked=0, Total=15252 [2022-11-03 02:28:36,163 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 356 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:36,163 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 265 Invalid, 781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 544 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:28:36,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-03 02:28:36,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 120. [2022-11-03 02:28:36,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:36,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2022-11-03 02:28:36,213 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 118 [2022-11-03 02:28:36,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:36,213 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2022-11-03 02:28:36,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:36,213 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2022-11-03 02:28:36,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-11-03 02:28:36,214 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:36,214 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2022-11-03 02:28:36,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:36,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-11-03 02:28:36,415 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:36,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:36,415 INFO L85 PathProgramCache]: Analyzing trace with hash 925564226, now seen corresponding path program 56 times [2022-11-03 02:28:36,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:36,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314237338] [2022-11-03 02:28:36,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:36,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:36,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:40,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:28:40,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:40,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314237338] [2022-11-03 02:28:40,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314237338] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:28:40,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273213398] [2022-11-03 02:28:40,289 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:28:40,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:40,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:40,291 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:40,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-11-03 02:28:55,108 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-11-03 02:28:55,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:28:55,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-03 02:28:55,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:57,288 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 02:29:01,001 INFO L356 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-03 02:29:01,001 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 23 [2022-11-03 02:29:01,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 1162 proven. 463 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:29:01,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:29:07,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2022-11-03 02:29:07,170 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2022-11-03 02:29:11,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 1134 proven. 491 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:29:11,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273213398] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:29:11,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1786174191] [2022-11-03 02:29:11,822 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:29:11,822 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:29:11,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:29:11,822 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:29:11,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:29:11,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:11,857 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:29:11,858 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:29:11,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:11,867 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:29:11,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:11,883 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:29:11,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:11,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:11,941 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:29:11,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:29:11,980 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:29:12,035 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:29:17,771 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39890#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:29:17,771 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:29:17,771 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:29:17,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 181 [2022-11-03 02:29:17,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965879531] [2022-11-03 02:29:17,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:29:17,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 181 states [2022-11-03 02:29:17,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:29:17,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 181 interpolants. [2022-11-03 02:29:17,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2589, Invalid=31821, Unknown=0, NotChecked=0, Total=34410 [2022-11-03 02:29:17,774 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 181 states, 181 states have (on average 1.9447513812154695) internal successors, (352), 181 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:28,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:29:28,402 INFO L93 Difference]: Finished difference Result 211 states and 213 transitions. [2022-11-03 02:29:28,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-11-03 02:29:28,403 INFO L78 Accepts]: Start accepts. Automaton has has 181 states, 181 states have (on average 1.9447513812154695) internal successors, (352), 181 states have internal predecessors, (352), 0 states have call successors, (0), 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 119 [2022-11-03 02:29:28,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:29:28,403 INFO L225 Difference]: With dead ends: 211 [2022-11-03 02:29:28,403 INFO L226 Difference]: Without dead ends: 121 [2022-11-03 02:29:28,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 232 SyntacticMatches, 30 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19566 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=5646, Invalid=61176, Unknown=0, NotChecked=0, Total=66822 [2022-11-03 02:29:28,406 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 167 mSDsluCounter, 2108 mSDsCounter, 0 mSdLazyCounter, 6389 mSolverCounterSat, 307 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 2137 SdHoareTripleChecker+Invalid, 6972 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 307 IncrementalHoareTripleChecker+Valid, 6389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 276 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:29:28,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 2137 Invalid, 6972 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [307 Valid, 6389 Invalid, 0 Unknown, 276 Unchecked, 3.5s Time] [2022-11-03 02:29:28,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-11-03 02:29:28,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2022-11-03 02:29:28,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.0166666666666666) internal successors, (122), 120 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:28,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2022-11-03 02:29:28,454 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 119 [2022-11-03 02:29:28,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:29:28,454 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2022-11-03 02:29:28,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 181 states, 181 states have (on average 1.9447513812154695) internal successors, (352), 181 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:28,454 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2022-11-03 02:29:28,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-11-03 02:29:28,456 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:29:28,456 INFO L195 NwaCegarLoop]: trace histogram [30, 29, 28, 28, 1, 1, 1, 1, 1] [2022-11-03 02:29:28,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-11-03 02:29:28,656 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-11-03 02:29:28,657 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:29:28,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:29:28,657 INFO L85 PathProgramCache]: Analyzing trace with hash 1400211996, now seen corresponding path program 57 times [2022-11-03 02:29:28,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:29:28,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443143] [2022-11-03 02:29:28,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:29:28,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:29:28,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:29:32,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 0 proven. 1655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:29:32,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:29:32,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443143] [2022-11-03 02:29:32,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443143] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:29:32,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147880773] [2022-11-03 02:29:32,063 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:29:32,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:29:32,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:29:32,064 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:29:32,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-03 02:29:32,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:29:32,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:29:32,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-03 02:29:32,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:29:32,508 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:29:32,639 INFO L356 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-03 02:29:32,640 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2022-11-03 02:29:35,613 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:29:35,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 0 proven. 1655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:29:35,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:29:36,397 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 35 [2022-11-03 02:29:36,399 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 47 [2022-11-03 02:29:36,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 0 proven. 1655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:29:36,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147880773] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:29:36,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70974418] [2022-11-03 02:29:36,517 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:29:36,517 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:29:36,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:29:36,517 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:29:36,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:29:36,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:36,541 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:29:36,542 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:29:36,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:36,566 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:29:36,567 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:29:36,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:36,584 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:29:36,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:36,617 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:29:36,642 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:29:36,642 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:29:36,711 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:29:36,778 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:29:37,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41360#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:29:37,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:29:37,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:29:37,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2022-11-03 02:29:37,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788720694] [2022-11-03 02:29:37,627 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:29:37,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-03 02:29:37,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:29:37,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-03 02:29:37,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=9437, Unknown=0, NotChecked=0, Total=9702 [2022-11-03 02:29:37,629 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand has 94 states, 94 states have (on average 2.24468085106383) internal successors, (211), 94 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:42,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:29:42,748 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2022-11-03 02:29:42,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-03 02:29:42,749 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.24468085106383) internal successors, (211), 94 states have internal predecessors, (211), 0 states have call successors, (0), 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 120 [2022-11-03 02:29:42,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:29:42,750 INFO L225 Difference]: With dead ends: 217 [2022-11-03 02:29:42,750 INFO L226 Difference]: Without dead ends: 215 [2022-11-03 02:29:42,751 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 317 SyntacticMatches, 7 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2251 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=488, Invalid=16542, Unknown=0, NotChecked=0, Total=17030 [2022-11-03 02:29:42,751 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 38 mSDsluCounter, 2354 mSDsCounter, 0 mSdLazyCounter, 6726 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 2352 SdHoareTripleChecker+Invalid, 6792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 6726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:29:42,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 2352 Invalid, 6792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 6726 Invalid, 0 Unknown, 1 Unchecked, 3.3s Time] [2022-11-03 02:29:42,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-11-03 02:29:42,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 125. [2022-11-03 02:29:42,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:42,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2022-11-03 02:29:42,824 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 120 [2022-11-03 02:29:42,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:29:42,825 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2022-11-03 02:29:42,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.24468085106383) internal successors, (211), 94 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:42,825 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2022-11-03 02:29:42,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-03 02:29:42,825 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:29:42,826 INFO L195 NwaCegarLoop]: trace histogram [31, 29, 28, 28, 1, 1, 1, 1, 1] [2022-11-03 02:29:42,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-11-03 02:29:43,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-11-03 02:29:43,026 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:29:43,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:29:43,026 INFO L85 PathProgramCache]: Analyzing trace with hash -1065576318, now seen corresponding path program 58 times [2022-11-03 02:29:43,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:29:43,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399338525] [2022-11-03 02:29:43,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:29:43,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:29:43,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:29:46,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 0 proven. 1686 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:29:46,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:29:46,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399338525] [2022-11-03 02:29:46,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [399338525] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:29:46,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961249947] [2022-11-03 02:29:46,698 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:29:46,698 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:29:46,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:29:46,699 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:29:46,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-03 02:29:47,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:29:47,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 131 conjunts are in the unsatisfiable core [2022-11-03 02:29:47,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:29:47,109 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:29:47,177 INFO L356 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2022-11-03 02:29:47,177 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2022-11-03 02:29:47,277 INFO L356 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2022-11-03 02:29:47,277 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 27 [2022-11-03 02:29:50,222 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:29:50,302 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 1 proven. 1685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:29:50,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:29:51,085 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2022-11-03 02:29:51,088 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 44 [2022-11-03 02:29:51,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 0 proven. 1686 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:29:51,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961249947] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:29:51,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [71711996] [2022-11-03 02:29:51,205 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:29:51,205 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:29:51,206 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:29:51,206 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:29:51,206 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:29:51,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:51,234 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:29:51,234 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:29:51,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:51,245 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:29:51,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:51,264 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:29:51,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:51,302 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:29:51,331 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:29:51,331 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:29:51,380 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:29:51,437 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:29:56,799 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42740#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:29:56,799 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:29:56,799 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:29:56,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 95 [2022-11-03 02:29:56,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152162487] [2022-11-03 02:29:56,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:29:56,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-11-03 02:29:56,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:29:56,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-11-03 02:29:56,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=9630, Unknown=0, NotChecked=0, Total=9900 [2022-11-03 02:29:56,802 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 95 states, 95 states have (on average 2.231578947368421) internal successors, (212), 95 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:03,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:03,298 INFO L93 Difference]: Finished difference Result 215 states and 217 transitions. [2022-11-03 02:30:03,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-11-03 02:30:03,299 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 2.231578947368421) internal successors, (212), 95 states have internal predecessors, (212), 0 states have call successors, (0), 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 [2022-11-03 02:30:03,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:03,300 INFO L225 Difference]: With dead ends: 215 [2022-11-03 02:30:03,300 INFO L226 Difference]: Without dead ends: 213 [2022-11-03 02:30:03,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 290 SyntacticMatches, 37 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5475 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=841, Invalid=24599, Unknown=0, NotChecked=0, Total=25440 [2022-11-03 02:30:03,301 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 110 mSDsluCounter, 2006 mSDsCounter, 0 mSdLazyCounter, 6315 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 2006 SdHoareTripleChecker+Invalid, 6555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 6315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:03,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 2006 Invalid, 6555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 6315 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-11-03 02:30:03,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-11-03 02:30:03,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 124. [2022-11-03 02:30:03,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:03,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2022-11-03 02:30:03,369 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 121 [2022-11-03 02:30:03,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:03,369 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2022-11-03 02:30:03,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 2.231578947368421) internal successors, (212), 95 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:03,369 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2022-11-03 02:30:03,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:30:03,370 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:03,370 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2022-11-03 02:30:03,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:03,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-03 02:30:03,570 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:30:03,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:03,571 INFO L85 PathProgramCache]: Analyzing trace with hash 997987553, now seen corresponding path program 59 times [2022-11-03 02:30:03,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:03,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814233710] [2022-11-03 02:30:03,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:03,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:03,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:07,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:30:07,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:07,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814233710] [2022-11-03 02:30:07,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814233710] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:07,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257993609] [2022-11-03 02:30:07,029 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:30:07,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:07,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:07,030 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:07,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-11-03 02:30:25,895 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2022-11-03 02:30:25,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:30:25,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 132 conjunts are in the unsatisfiable core [2022-11-03 02:30:25,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:28,254 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 02:30:32,226 INFO L356 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-03 02:30:32,227 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 23 [2022-11-03 02:30:32,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 1247 proven. 494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:30:32,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:38,683 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2022-11-03 02:30:38,685 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2022-11-03 02:30:43,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 1218 proven. 523 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:30:43,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257993609] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:43,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024205127] [2022-11-03 02:30:43,552 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:30:43,552 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:43,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:43,552 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:43,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:43,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:43,574 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:30:43,574 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:30:43,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:43,607 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:30:43,608 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:30:43,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:43,626 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:30:43,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:43,661 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:30:43,685 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:30:43,685 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:30:43,728 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:30:43,779 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:49,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44276#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:30:49,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:30:49,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:30:49,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 187 [2022-11-03 02:30:49,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575132780] [2022-11-03 02:30:49,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:30:49,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 187 states [2022-11-03 02:30:49,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:49,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 187 interpolants. [2022-11-03 02:30:49,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2752, Invalid=33920, Unknown=0, NotChecked=0, Total=36672 [2022-11-03 02:30:49,698 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 187 states, 187 states have (on average 1.946524064171123) internal successors, (364), 187 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:07,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:07,122 INFO L93 Difference]: Finished difference Result 223 states and 226 transitions. [2022-11-03 02:31:07,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 170 states. [2022-11-03 02:31:07,122 INFO L78 Accepts]: Start accepts. Automaton has has 187 states, 187 states have (on average 1.946524064171123) internal successors, (364), 187 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2022-11-03 02:31:07,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:07,123 INFO L225 Difference]: With dead ends: 223 [2022-11-03 02:31:07,123 INFO L226 Difference]: Without dead ends: 130 [2022-11-03 02:31:07,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 569 GetRequests, 213 SyntacticMatches, 31 SemanticMatches, 325 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31942 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=7265, Invalid=99337, Unknown=0, NotChecked=0, Total=106602 [2022-11-03 02:31:07,127 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 228 mSDsluCounter, 2344 mSDsCounter, 0 mSdLazyCounter, 6892 mSolverCounterSat, 528 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 2374 SdHoareTripleChecker+Invalid, 8396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 528 IncrementalHoareTripleChecker+Valid, 6892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 976 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:07,128 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 2374 Invalid, 8396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [528 Valid, 6892 Invalid, 0 Unknown, 976 Unchecked, 3.8s Time] [2022-11-03 02:31:07,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-11-03 02:31:07,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 128. [2022-11-03 02:31:07,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:07,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2022-11-03 02:31:07,194 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 123 [2022-11-03 02:31:07,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:07,194 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2022-11-03 02:31:07,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 187 states, 187 states have (on average 1.946524064171123) internal successors, (364), 187 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:07,195 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2022-11-03 02:31:07,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-03 02:31:07,195 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:07,195 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1, 1] [2022-11-03 02:31:07,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:07,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:07,399 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:07,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:07,399 INFO L85 PathProgramCache]: Analyzing trace with hash 1133183458, now seen corresponding path program 60 times [2022-11-03 02:31:07,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:07,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677932169] [2022-11-03 02:31:07,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:07,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:07,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:11,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:11,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:11,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677932169] [2022-11-03 02:31:11,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677932169] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:31:11,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207709342] [2022-11-03 02:31:11,243 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:31:11,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:11,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:11,244 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:11,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-03 02:31:11,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:31:11,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:31:11,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 611 conjuncts, 133 conjunts are in the unsatisfiable core [2022-11-03 02:31:11,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:11,674 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:31:15,032 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:31:15,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:15,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:15,795 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:31:15,797 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:31:15,801 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:31:15,803 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:31:15,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:15,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207709342] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:15,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1432722643] [2022-11-03 02:31:15,919 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:31:15,919 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:15,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:15,920 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:15,920 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:15,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:15,943 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:31:15,944 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:31:15,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:15,952 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:31:15,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:15,966 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:31:15,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:16,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:16,015 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:31:16,016 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:31:16,058 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:31:16,096 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:20,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45917#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:20,861 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:20,862 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:31:20,862 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 98 [2022-11-03 02:31:20,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034849985] [2022-11-03 02:31:20,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:20,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-11-03 02:31:20,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:20,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-11-03 02:31:20,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=10232, Unknown=0, NotChecked=0, Total=10506 [2022-11-03 02:31:20,864 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 98 states, 98 states have (on average 2.2653061224489797) internal successors, (222), 98 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:27,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:27,011 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2022-11-03 02:31:27,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-03 02:31:27,011 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 2.2653061224489797) internal successors, (222), 98 states have internal predecessors, (222), 0 states have call successors, (0), 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 127 [2022-11-03 02:31:27,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:27,012 INFO L225 Difference]: With dead ends: 135 [2022-11-03 02:31:27,012 INFO L226 Difference]: Without dead ends: 133 [2022-11-03 02:31:27,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 307 SyntacticMatches, 37 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3490 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=511, Invalid=18121, Unknown=0, NotChecked=0, Total=18632 [2022-11-03 02:31:27,013 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 40 mSDsluCounter, 2486 mSDsCounter, 0 mSdLazyCounter, 7819 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 2486 SdHoareTripleChecker+Invalid, 7946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 7819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:27,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 2486 Invalid, 7946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 7819 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-11-03 02:31:27,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-11-03 02:31:27,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2022-11-03 02:31:27,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 130 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:27,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 132 transitions. [2022-11-03 02:31:27,086 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 132 transitions. Word has length 127 [2022-11-03 02:31:27,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:27,086 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 132 transitions. [2022-11-03 02:31:27,086 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 2.2653061224489797) internal successors, (222), 98 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:27,087 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 132 transitions. [2022-11-03 02:31:27,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-03 02:31:27,087 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:27,088 INFO L195 NwaCegarLoop]: trace histogram [32, 31, 31, 31, 1, 1, 1, 1, 1] [2022-11-03 02:31:27,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:27,288 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2022-11-03 02:31:27,289 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:27,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:27,289 INFO L85 PathProgramCache]: Analyzing trace with hash 230244187, now seen corresponding path program 61 times [2022-11-03 02:31:27,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:27,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971146592] [2022-11-03 02:31:27,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:27,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:27,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:29,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1366 proven. 587 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:29,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:29,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971146592] [2022-11-03 02:31:29,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971146592] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:31:29,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706590762] [2022-11-03 02:31:29,431 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:31:29,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:29,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:29,433 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:29,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-03 02:31:29,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:29,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-03 02:31:29,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:31,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:31,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:33,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:33,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1706590762] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:33,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [999623679] [2022-11-03 02:31:33,331 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:31:33,331 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:33,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:33,331 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:33,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:33,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:33,358 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:31:33,359 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:31:33,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:33,386 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:31:33,386 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:31:33,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:33,402 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:31:33,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:33,435 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:31:33,458 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:31:33,459 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:31:33,502 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:31:33,556 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:37,371 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47259#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:37,371 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:37,371 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:31:37,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 100 [2022-11-03 02:31:37,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619972633] [2022-11-03 02:31:37,371 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:37,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-03 02:31:37,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:37,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-03 02:31:37,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2295, Invalid=8625, Unknown=0, NotChecked=0, Total=10920 [2022-11-03 02:31:37,374 INFO L87 Difference]: Start difference. First operand 131 states and 132 transitions. Second operand has 100 states, 100 states have (on average 2.31) internal successors, (231), 100 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:38,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:38,650 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2022-11-03 02:31:38,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-03 02:31:38,651 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 2.31) internal successors, (231), 100 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2022-11-03 02:31:38,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:38,652 INFO L225 Difference]: With dead ends: 237 [2022-11-03 02:31:38,652 INFO L226 Difference]: Without dead ends: 138 [2022-11-03 02:31:38,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 256 SyntacticMatches, 95 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10785 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=3907, Invalid=14453, Unknown=0, NotChecked=0, Total=18360 [2022-11-03 02:31:38,654 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 428 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 428 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:38,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [428 Valid, 274 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:31:38,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-11-03 02:31:38,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 132. [2022-11-03 02:31:38,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:38,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2022-11-03 02:31:38,732 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 130 [2022-11-03 02:31:38,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:38,732 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2022-11-03 02:31:38,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 2.31) internal successors, (231), 100 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:38,733 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2022-11-03 02:31:38,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-03 02:31:38,733 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:38,734 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1, 1] [2022-11-03 02:31:38,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:38,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2022-11-03 02:31:38,947 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:38,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:38,947 INFO L85 PathProgramCache]: Analyzing trace with hash -219806143, now seen corresponding path program 62 times [2022-11-03 02:31:38,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:38,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025199441] [2022-11-03 02:31:38,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:38,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:39,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:43,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:43,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:43,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025199441] [2022-11-03 02:31:43,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025199441] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:31:43,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745050649] [2022-11-03 02:31:43,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:31:43,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:43,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:43,007 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:43,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-11-03 02:31:54,051 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2022-11-03 02:31:54,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:31:54,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 137 conjunts are in the unsatisfiable core [2022-11-03 02:31:54,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:54,186 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:31:57,789 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:31:57,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:57,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:58,586 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:31:58,587 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:31:58,593 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:31:58,596 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:31:58,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:58,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745050649] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:58,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1081680902] [2022-11-03 02:31:58,731 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:31:58,731 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:58,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:58,732 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:58,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:58,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:58,768 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:31:58,768 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:31:58,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:58,780 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:31:58,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:58,798 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:31:58,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:58,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:58,846 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:31:58,847 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:31:58,885 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:31:58,941 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:03,959 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48740#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:32:03,960 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:03,960 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:32:03,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 101 [2022-11-03 02:32:03,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538043127] [2022-11-03 02:32:03,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:03,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-03 02:32:03,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:03,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-03 02:32:03,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=10848, Unknown=0, NotChecked=0, Total=11130 [2022-11-03 02:32:03,963 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand has 101 states, 101 states have (on average 2.267326732673267) internal successors, (229), 101 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:10,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:10,382 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2022-11-03 02:32:10,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2022-11-03 02:32:10,383 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.267326732673267) internal successors, (229), 101 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2022-11-03 02:32:10,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:10,384 INFO L225 Difference]: With dead ends: 139 [2022-11-03 02:32:10,384 INFO L226 Difference]: Without dead ends: 137 [2022-11-03 02:32:10,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 317 SyntacticMatches, 38 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3698 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=526, Invalid=19214, Unknown=0, NotChecked=0, Total=19740 [2022-11-03 02:32:10,386 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 42 mSDsluCounter, 2601 mSDsCounter, 0 mSdLazyCounter, 8197 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 2599 SdHoareTripleChecker+Invalid, 8329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 8197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:10,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 2599 Invalid, 8329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 8197 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-03 02:32:10,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-11-03 02:32:10,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 135. [2022-11-03 02:32:10,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:10,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2022-11-03 02:32:10,460 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 131 [2022-11-03 02:32:10,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:10,460 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2022-11-03 02:32:10,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.267326732673267) internal successors, (229), 101 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:10,461 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2022-11-03 02:32:10,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-11-03 02:32:10,461 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:10,462 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1, 1] [2022-11-03 02:32:10,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:10,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:10,662 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:10,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:10,663 INFO L85 PathProgramCache]: Analyzing trace with hash 1585113756, now seen corresponding path program 63 times [2022-11-03 02:32:10,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:10,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079052730] [2022-11-03 02:32:10,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:10,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:10,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:12,994 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1458 proven. 622 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:12,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:12,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079052730] [2022-11-03 02:32:12,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079052730] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:32:12,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101747108] [2022-11-03 02:32:12,996 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:32:12,996 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:12,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:12,997 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:12,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-11-03 02:32:13,344 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:32:13,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:32:13,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-03 02:32:13,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:15,735 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:15,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:17,412 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:17,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101747108] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:17,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [26572142] [2022-11-03 02:32:17,413 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:32:17,413 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:17,414 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:17,414 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:17,414 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:17,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:17,439 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:32:17,439 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:32:17,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:17,469 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:32:17,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:17,488 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:32:17,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:17,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:17,547 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:32:17,548 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:32:17,593 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:32:17,667 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:20,638 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50123#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:32:20,639 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:20,639 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:32:20,639 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 103 [2022-11-03 02:32:20,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228703729] [2022-11-03 02:32:20,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:20,640 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-03 02:32:20,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:20,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-03 02:32:20,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2432, Invalid=9124, Unknown=0, NotChecked=0, Total=11556 [2022-11-03 02:32:20,642 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:21,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:21,986 INFO L93 Difference]: Finished difference Result 244 states and 246 transitions. [2022-11-03 02:32:21,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-03 02:32:21,987 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 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 134 [2022-11-03 02:32:21,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:21,987 INFO L225 Difference]: With dead ends: 244 [2022-11-03 02:32:21,987 INFO L226 Difference]: Without dead ends: 142 [2022-11-03 02:32:21,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 264 SyntacticMatches, 98 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11436 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=4144, Invalid=15316, Unknown=0, NotChecked=0, Total=19460 [2022-11-03 02:32:21,989 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 460 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 593 mSolverCounterSat, 297 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 460 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 297 IncrementalHoareTripleChecker+Valid, 593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:21,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [460 Valid, 289 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [297 Valid, 593 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:32:21,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-03 02:32:22,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 136. [2022-11-03 02:32:22,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:22,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2022-11-03 02:32:22,072 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2022-11-03 02:32:22,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:22,072 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2022-11-03 02:32:22,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:22,073 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2022-11-03 02:32:22,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-03 02:32:22,074 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:22,074 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1, 1] [2022-11-03 02:32:22,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:22,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:22,287 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:22,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:22,287 INFO L85 PathProgramCache]: Analyzing trace with hash -1065496958, now seen corresponding path program 64 times [2022-11-03 02:32:22,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:22,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45024539] [2022-11-03 02:32:22,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:22,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:22,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:26,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:26,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:26,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45024539] [2022-11-03 02:32:26,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45024539] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:32:26,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701803797] [2022-11-03 02:32:26,686 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:32:26,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:26,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:26,687 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:26,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-03 02:32:27,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:27,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 141 conjunts are in the unsatisfiable core [2022-11-03 02:32:27,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:27,174 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:32:31,107 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:32:31,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:31,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:31,960 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:32:31,962 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:32:31,972 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:32:31,975 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:32:32,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:32,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701803797] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:32,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [689769534] [2022-11-03 02:32:32,135 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:32:32,135 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:32,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:32,136 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:32,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:32,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:32,162 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:32:32,162 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:32:32,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:32,186 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:32:32,186 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:32:32,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:32,204 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:32:32,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:32,245 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:32:32,273 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:32:32,273 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:32:32,328 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:32:32,366 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:33,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51649#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:32:33,363 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:33,363 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:32:33,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 104 [2022-11-03 02:32:33,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882455286] [2022-11-03 02:32:33,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:33,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-11-03 02:32:33,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:33,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-11-03 02:32:33,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=11482, Unknown=0, NotChecked=0, Total=11772 [2022-11-03 02:32:33,365 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 104 states, 104 states have (on average 2.269230769230769) internal successors, (236), 104 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:40,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:40,172 INFO L93 Difference]: Finished difference Result 143 states and 144 transitions. [2022-11-03 02:32:40,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-03 02:32:40,173 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 2.269230769230769) internal successors, (236), 104 states have internal predecessors, (236), 0 states have call successors, (0), 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 135 [2022-11-03 02:32:40,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:40,174 INFO L225 Difference]: With dead ends: 143 [2022-11-03 02:32:40,174 INFO L226 Difference]: Without dead ends: 141 [2022-11-03 02:32:40,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 360 SyntacticMatches, 6 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2661 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=541, Invalid=20339, Unknown=0, NotChecked=0, Total=20880 [2022-11-03 02:32:40,175 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 44 mSDsluCounter, 2744 mSDsCounter, 0 mSdLazyCounter, 8477 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 2744 SdHoareTripleChecker+Invalid, 8614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 8477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:40,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 2744 Invalid, 8614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 8477 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-11-03 02:32:40,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-03 02:32:40,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2022-11-03 02:32:40,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.0144927536231885) internal successors, (140), 138 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:40,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2022-11-03 02:32:40,308 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 135 [2022-11-03 02:32:40,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:40,308 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2022-11-03 02:32:40,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 2.269230769230769) internal successors, (236), 104 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:40,309 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2022-11-03 02:32:40,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-11-03 02:32:40,310 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:40,310 INFO L195 NwaCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1, 1] [2022-11-03 02:32:40,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:40,532 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2022-11-03 02:32:40,532 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:40,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:40,533 INFO L85 PathProgramCache]: Analyzing trace with hash 1888202427, now seen corresponding path program 65 times [2022-11-03 02:32:40,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:40,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001664334] [2022-11-03 02:32:40,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:40,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:40,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:42,947 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1553 proven. 658 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:42,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:42,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001664334] [2022-11-03 02:32:42,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001664334] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:32:42,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558240540] [2022-11-03 02:32:42,948 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:32:42,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:42,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:42,949 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:42,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-11-03 02:33:29,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2022-11-03 02:33:29,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:33:29,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 680 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-03 02:33:29,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:33:31,844 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:33:31,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:33:33,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:33:33,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558240540] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:33:33,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295169563] [2022-11-03 02:33:33,587 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:33:33,587 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:33:33,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:33:33,588 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:33:33,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:33:33,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:33,609 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:33:33,609 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:33:33,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:33,630 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:33:33,630 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:33:33,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:33,650 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:33:33,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:33,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:33,696 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:33:33,697 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:33:33,731 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:33:33,776 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:33:36,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53073#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:33:36,857 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:33:36,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:33:36,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 106 [2022-11-03 02:33:36,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117552501] [2022-11-03 02:33:36,857 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:33:36,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-03 02:33:36,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:33:36,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-03 02:33:36,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2573, Invalid=9637, Unknown=0, NotChecked=0, Total=12210 [2022-11-03 02:33:36,859 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:38,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:33:38,250 INFO L93 Difference]: Finished difference Result 251 states and 253 transitions. [2022-11-03 02:33:38,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-03 02:33:38,250 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 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 138 [2022-11-03 02:33:38,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:33:38,252 INFO L225 Difference]: With dead ends: 251 [2022-11-03 02:33:38,252 INFO L226 Difference]: Without dead ends: 146 [2022-11-03 02:33:38,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 272 SyntacticMatches, 101 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12106 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=4388, Invalid=16204, Unknown=0, NotChecked=0, Total=20592 [2022-11-03 02:33:38,253 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 452 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 738 mSolverCounterSat, 293 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 452 SdHoareTripleChecker+Valid, 363 SdHoareTripleChecker+Invalid, 1031 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 738 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:33:38,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [452 Valid, 363 Invalid, 1031 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [293 Valid, 738 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:33:38,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-03 02:33:38,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 140. [2022-11-03 02:33:38,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.014388489208633) internal successors, (141), 139 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:38,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2022-11-03 02:33:38,348 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 138 [2022-11-03 02:33:38,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:33:38,348 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2022-11-03 02:33:38,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:38,348 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2022-11-03 02:33:38,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-11-03 02:33:38,349 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:33:38,349 INFO L195 NwaCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1, 1, 1, 1] [2022-11-03 02:33:38,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2022-11-03 02:33:38,549 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:38,550 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:33:38,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:33:38,550 INFO L85 PathProgramCache]: Analyzing trace with hash -1928450143, now seen corresponding path program 66 times [2022-11-03 02:33:38,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:33:38,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502289697] [2022-11-03 02:33:38,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:33:38,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:33:38,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:33:43,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:33:43,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:33:43,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502289697] [2022-11-03 02:33:43,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502289697] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:33:43,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746844804] [2022-11-03 02:33:43,068 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:33:43,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:43,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:33:43,069 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:33:43,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-11-03 02:33:43,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:33:43,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:33:43,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 145 conjunts are in the unsatisfiable core [2022-11-03 02:33:43,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:33:43,747 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-03 02:33:47,884 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 23 [2022-11-03 02:33:47,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:33:47,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:33:48,662 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:33:48,664 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:33:48,668 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-03 02:33:48,670 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:33:48,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:33:48,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746844804] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:33:48,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1329781205] [2022-11-03 02:33:48,798 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:33:48,798 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:33:48,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:33:48,798 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:33:48,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:33:48,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:48,827 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:33:48,828 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 28 [2022-11-03 02:33:48,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:48,854 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:33:48,854 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:33:48,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:48,870 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 35 [2022-11-03 02:33:48,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:48,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:48,924 INFO L356 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-11-03 02:33:48,925 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 202 treesize of output 199 [2022-11-03 02:33:48,979 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:33:49,037 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:33:54,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54644#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:33:54,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:33:54,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:33:54,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 107 [2022-11-03 02:33:54,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348600724] [2022-11-03 02:33:54,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:33:54,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-11-03 02:33:54,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:33:54,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-11-03 02:33:54,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=12134, Unknown=0, NotChecked=0, Total=12432 [2022-11-03 02:33:54,711 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand has 107 states, 107 states have (on average 2.2710280373831777) internal successors, (243), 107 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:01,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:34:01,535 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2022-11-03 02:34:01,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-11-03 02:34:01,535 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 2.2710280373831777) internal successors, (243), 107 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2022-11-03 02:34:01,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:34:01,536 INFO L225 Difference]: With dead ends: 147 [2022-11-03 02:34:01,536 INFO L226 Difference]: Without dead ends: 145 [2022-11-03 02:34:01,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 337 SyntacticMatches, 40 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4132 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=556, Invalid=21496, Unknown=0, NotChecked=0, Total=22052 [2022-11-03 02:34:01,537 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 43 mSDsluCounter, 2692 mSDsCounter, 0 mSdLazyCounter, 8474 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 2692 SdHoareTripleChecker+Invalid, 8613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 8474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:34:01,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 2692 Invalid, 8613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 8474 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-11-03 02:34:01,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-11-03 02:34:01,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 143. [2022-11-03 02:34:01,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:01,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2022-11-03 02:34:01,616 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 139 [2022-11-03 02:34:01,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:34:01,617 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2022-11-03 02:34:01,617 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 2.2710280373831777) internal successors, (243), 107 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:01,617 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2022-11-03 02:34:01,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-03 02:34:01,618 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:34:01,618 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1, 1] [2022-11-03 02:34:01,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2022-11-03 02:34:01,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2022-11-03 02:34:01,847 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:34:01,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:34:01,847 INFO L85 PathProgramCache]: Analyzing trace with hash -970865348, now seen corresponding path program 67 times [2022-11-03 02:34:01,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:34:01,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957592886] [2022-11-03 02:34:01,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:34:01,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:34:01,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:34:04,850 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1651 proven. 695 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:34:04,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:34:04,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957592886] [2022-11-03 02:34:04,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957592886] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:34:04,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641984131] [2022-11-03 02:34:04,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:34:04,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:34:04,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:34:04,851 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:34:04,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-11-03 02:34:05,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:34:05,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-03 02:34:05,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:34:07,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:34:07,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:34:09,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:34:09,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641984131] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:34:09,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [259763634] [2022-11-03 02:34:09,699 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:34:09,699 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:34:09,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:34:09,699 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:34:09,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:34:09,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:34:09,724 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:34:09,724 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:34:09,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:34:09,732 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2022-11-03 02:34:09,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:34:09,749 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:34:09,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:34:09,779 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:34:09,804 INFO L356 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-11-03 02:34:09,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 195 treesize of output 198 [2022-11-03 02:34:09,851 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2022-11-03 02:34:09,909 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:34:14,348 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56109#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (<= 0 |ULTIMATE.start_main_~#a~0#1.offset|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (<= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:34:14,348 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:34:14,348 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:34:14,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2022-11-03 02:34:14,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507741255] [2022-11-03 02:34:14,349 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:34:14,349 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-11-03 02:34:14,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:34:14,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-11-03 02:34:14,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2718, Invalid=10164, Unknown=0, NotChecked=0, Total=12882 [2022-11-03 02:34:14,351 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:15,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:34:15,880 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2022-11-03 02:34:15,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-03 02:34:15,880 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 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 142 [2022-11-03 02:34:15,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:34:15,881 INFO L225 Difference]: With dead ends: 258 [2022-11-03 02:34:15,882 INFO L226 Difference]: Without dead ends: 150 [2022-11-03 02:34:15,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 280 SyntacticMatches, 104 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12795 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=4639, Invalid=17117, Unknown=0, NotChecked=0, Total=21756 [2022-11-03 02:34:15,884 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 336 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 781 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 1018 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 781 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:34:15,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 385 Invalid, 1018 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 781 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:34:15,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-11-03 02:34:16,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 144. [2022-11-03 02:34:16,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:16,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2022-11-03 02:34:16,022 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 142 [2022-11-03 02:34:16,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:34:16,022 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2022-11-03 02:34:16,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:16,022 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2022-11-03 02:34:16,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-03 02:34:16,023 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:34:16,023 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1, 1, 1, 1] [2022-11-03 02:34:16,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2022-11-03 02:34:16,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2022-11-03 02:34:16,223 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:34:16,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:34:16,224 INFO L85 PathProgramCache]: Analyzing trace with hash -368221406, now seen corresponding path program 68 times [2022-11-03 02:34:16,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:34:16,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707091901] [2022-11-03 02:34:16,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:34:16,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:34:16,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:34:20,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:34:20,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:34:20,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707091901] [2022-11-03 02:34:20,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707091901] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:34:20,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834756205] [2022-11-03 02:34:20,927 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:34:20,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:34:20,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:34:20,928 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:34:20,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0433b272-fd7c-4de5-8857-94bb90942558/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process