./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bd654f01b412711828f8177df5f8f7c2933e3d7436939e6c61fdcced19c9515c --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 13:16:44,314 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 13:16:44,315 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 13:16:44,333 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 13:16:44,334 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 13:16:44,335 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 13:16:44,336 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 13:16:44,338 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 13:16:44,339 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 13:16:44,340 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 13:16:44,341 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 13:16:44,342 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 13:16:44,342 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 13:16:44,343 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 13:16:44,344 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 13:16:44,345 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 13:16:44,346 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 13:16:44,347 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 13:16:44,349 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 13:16:44,350 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 13:16:44,352 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 13:16:44,353 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 13:16:44,354 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 13:16:44,355 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 13:16:44,358 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 13:16:44,358 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 13:16:44,359 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 13:16:44,360 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 13:16:44,360 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 13:16:44,361 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 13:16:44,361 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 13:16:44,362 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 13:16:44,363 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 13:16:44,364 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 13:16:44,364 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 13:16:44,365 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 13:16:44,365 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 13:16:44,365 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 13:16:44,365 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 13:16:44,366 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 13:16:44,366 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 13:16:44,367 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 13:16:44,387 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 13:16:44,387 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 13:16:44,387 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 13:16:44,388 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 13:16:44,388 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 13:16:44,388 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 13:16:44,389 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 13:16:44,389 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 13:16:44,389 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 13:16:44,389 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 13:16:44,389 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 13:16:44,389 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 13:16:44,390 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 13:16:44,390 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 13:16:44,390 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 13:16:44,390 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 13:16:44,390 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 13:16:44,390 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 13:16:44,391 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 13:16:44,391 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 13:16:44,391 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 13:16:44,391 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 13:16:44,392 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 13:16:44,392 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 13:16:44,392 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 13:16:44,392 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 13:16:44,392 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 13:16:44,392 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 13:16:44,392 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 13:16:44,393 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 13:16:44,393 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 13:16:44,393 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 13:16:44,393 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:16:44,393 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 13:16:44,393 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 13:16:44,394 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 13:16:44,394 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 13:16:44,394 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 13:16:44,394 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 13:16:44,394 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 13:16:44,394 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 13:16:44,394 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_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bd654f01b412711828f8177df5f8f7c2933e3d7436939e6c61fdcced19c9515c [2022-12-14 13:16:44,584 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 13:16:44,601 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 13:16:44,603 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 13:16:44,604 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 13:16:44,604 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 13:16:44,605 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c [2022-12-14 13:16:47,267 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 13:16:47,443 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 13:16:47,444 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c [2022-12-14 13:16:47,448 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/data/e2c2ceac1/d4f457c0c5b5482fbd46cf5545420e32/FLAGbf7682177 [2022-12-14 13:16:47,461 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/data/e2c2ceac1/d4f457c0c5b5482fbd46cf5545420e32 [2022-12-14 13:16:47,463 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 13:16:47,464 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 13:16:47,465 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 13:16:47,465 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 13:16:47,468 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 13:16:47,468 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,469 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@727a81a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47, skipping insertion in model container [2022-12-14 13:16:47,469 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,474 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 13:16:47,485 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 13:16:47,585 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c[408,421] [2022-12-14 13:16:47,605 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:16:47,613 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 13:16:47,624 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c[408,421] [2022-12-14 13:16:47,632 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:16:47,645 INFO L208 MainTranslator]: Completed translation [2022-12-14 13:16:47,645 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47 WrapperNode [2022-12-14 13:16:47,645 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 13:16:47,646 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 13:16:47,646 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 13:16:47,647 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 13:16:47,653 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,660 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,678 INFO L138 Inliner]: procedures = 16, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 104 [2022-12-14 13:16:47,679 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 13:16:47,679 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 13:16:47,679 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 13:16:47,680 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 13:16:47,687 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,687 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,690 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,690 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,695 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,699 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,701 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,702 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,705 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 13:16:47,706 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 13:16:47,706 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 13:16:47,706 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 13:16:47,707 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (1/1) ... [2022-12-14 13:16:47,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:16:47,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:16:47,730 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 13:16:47,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 13:16:47,756 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 13:16:47,756 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 13:16:47,756 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 13:16:47,757 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-12-14 13:16:47,757 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 13:16:47,757 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 13:16:47,757 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 13:16:47,820 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 13:16:47,822 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 13:16:47,964 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 13:16:48,005 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 13:16:48,005 INFO L300 CfgBuilder]: Removed 7 assume(true) statements. [2022-12-14 13:16:48,007 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:16:48 BoogieIcfgContainer [2022-12-14 13:16:48,007 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 13:16:48,008 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 13:16:48,008 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 13:16:48,011 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 13:16:48,011 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:16:47" (1/3) ... [2022-12-14 13:16:48,011 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22ad4108 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:16:48, skipping insertion in model container [2022-12-14 13:16:48,011 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:16:47" (2/3) ... [2022-12-14 13:16:48,011 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22ad4108 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:16:48, skipping insertion in model container [2022-12-14 13:16:48,012 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:16:48" (3/3) ... [2022-12-14 13:16:48,013 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m3.c [2022-12-14 13:16:48,026 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 13:16:48,026 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 13:16:48,059 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 13:16:48,064 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;@30642444, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 13:16:48,064 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 13:16:48,067 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:48,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 13:16:48,073 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:16:48,073 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:16:48,074 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:16:48,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:16:48,078 INFO L85 PathProgramCache]: Analyzing trace with hash 245696831, now seen corresponding path program 1 times [2022-12-14 13:16:48,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:16:48,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213261643] [2022-12-14 13:16:48,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:48,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:16:48,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:48,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:16:48,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:16:48,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213261643] [2022-12-14 13:16:48,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213261643] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:16:48,251 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:16:48,251 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 13:16:48,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403779038] [2022-12-14 13:16:48,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:16:48,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 13:16:48,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:16:48,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 13:16:48,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:16:48,280 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:48,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:16:48,333 INFO L93 Difference]: Finished difference Result 28 states and 43 transitions. [2022-12-14 13:16:48,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 13:16:48,335 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-12-14 13:16:48,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:16:48,341 INFO L225 Difference]: With dead ends: 28 [2022-12-14 13:16:48,341 INFO L226 Difference]: Without dead ends: 13 [2022-12-14 13:16:48,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:16:48,345 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:16:48,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:16:48,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-12-14 13:16:48,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-12-14 13:16:48,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 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) [2022-12-14 13:16:48,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 19 transitions. [2022-12-14 13:16:48,369 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 19 transitions. Word has length 11 [2022-12-14 13:16:48,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:16:48,369 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 19 transitions. [2022-12-14 13:16:48,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:48,370 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 19 transitions. [2022-12-14 13:16:48,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 13:16:48,370 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:16:48,370 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:16:48,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 13:16:48,371 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:16:48,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:16:48,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1556405487, now seen corresponding path program 1 times [2022-12-14 13:16:48,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:16:48,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707387608] [2022-12-14 13:16:48,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:48,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:16:48,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:48,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:16:48,446 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:16:48,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707387608] [2022-12-14 13:16:48,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707387608] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:16:48,447 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:16:48,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 13:16:48,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837119449] [2022-12-14 13:16:48,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:16:48,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 13:16:48,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:16:48,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 13:16:48,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:16:48,450 INFO L87 Difference]: Start difference. First operand 13 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 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) [2022-12-14 13:16:48,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:16:48,502 INFO L93 Difference]: Finished difference Result 27 states and 43 transitions. [2022-12-14 13:16:48,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 13:16:48,502 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 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) Word has length 12 [2022-12-14 13:16:48,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:16:48,503 INFO L225 Difference]: With dead ends: 27 [2022-12-14 13:16:48,503 INFO L226 Difference]: Without dead ends: 19 [2022-12-14 13:16:48,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:16:48,504 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:16:48,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 5 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:16:48,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-12-14 13:16:48,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-12-14 13:16:48,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 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) [2022-12-14 13:16:48,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2022-12-14 13:16:48,508 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 12 [2022-12-14 13:16:48,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:16:48,508 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2022-12-14 13:16:48,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 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) [2022-12-14 13:16:48,509 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2022-12-14 13:16:48,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 13:16:48,509 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:16:48,509 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:16:48,509 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 13:16:48,509 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:16:48,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:16:48,510 INFO L85 PathProgramCache]: Analyzing trace with hash 958119109, now seen corresponding path program 1 times [2022-12-14 13:16:48,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:16:48,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225003810] [2022-12-14 13:16:48,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:48,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:16:48,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:48,613 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:16:48,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:16:48,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225003810] [2022-12-14 13:16:48,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225003810] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:16:48,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864476829] [2022-12-14 13:16:48,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:48,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:16:48,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:16:48,616 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:16:48,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 13:16:48,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:48,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 13:16:48,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:16:48,729 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:16:48,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:16:48,751 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:16:48,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864476829] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:16:48,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1454527752] [2022-12-14 13:16:48,769 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:16:48,769 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:16:48,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:16:48,777 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:16:48,777 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:16:48,894 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:16:48,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:16:48,913 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:16:48,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:16:49,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:49,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:49,045 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:16:49,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:16:49,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:16:49,349 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:16:49,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '278#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:16:49,521 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:16:49,521 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:16:49,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-12-14 13:16:49,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113228719] [2022-12-14 13:16:49,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:16:49,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 13:16:49,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:16:49,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 13:16:49,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-12-14 13:16:49,523 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:49,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:16:49,565 INFO L93 Difference]: Finished difference Result 35 states and 47 transitions. [2022-12-14 13:16:49,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 13:16:49,565 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-12-14 13:16:49,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:16:49,566 INFO L225 Difference]: With dead ends: 35 [2022-12-14 13:16:49,566 INFO L226 Difference]: Without dead ends: 20 [2022-12-14 13:16:49,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-12-14 13:16:49,568 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:16:49,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:16:49,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-12-14 13:16:49,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-12-14 13:16:49,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:49,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2022-12-14 13:16:49,571 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 18 [2022-12-14 13:16:49,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:16:49,571 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2022-12-14 13:16:49,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:49,572 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2022-12-14 13:16:49,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 13:16:49,572 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:16:49,572 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:16:49,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 13:16:49,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:16:49,774 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:16:49,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:16:49,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1662557419, now seen corresponding path program 2 times [2022-12-14 13:16:49,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:16:49,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165407854] [2022-12-14 13:16:49,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:49,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:16:49,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:49,952 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 13:16:49,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:16:49,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165407854] [2022-12-14 13:16:49,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165407854] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:16:49,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524621461] [2022-12-14 13:16:49,953 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:16:49,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:16:49,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:16:49,954 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:16:49,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 13:16:50,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 13:16:50,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:16:50,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 13:16:50,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:16:50,039 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 13:16:50,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:16:50,058 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 13:16:50,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [524621461] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:16:50,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1286758690] [2022-12-14 13:16:50,061 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:16:50,061 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:16:50,062 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:16:50,062 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:16:50,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:16:50,115 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:16:50,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:16:50,126 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:16:50,146 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:16:50,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:50,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:50,217 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:16:50,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:16:50,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:16:50,412 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:16:50,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '496#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:16:50,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:16:50,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:16:50,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-12-14 13:16:50,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316853363] [2022-12-14 13:16:50,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:16:50,560 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 13:16:50,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:16:50,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 13:16:50,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-12-14 13:16:50,561 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:50,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:16:50,612 INFO L93 Difference]: Finished difference Result 39 states and 55 transitions. [2022-12-14 13:16:50,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 13:16:50,612 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-12-14 13:16:50,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:16:50,613 INFO L225 Difference]: With dead ends: 39 [2022-12-14 13:16:50,613 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 13:16:50,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-12-14 13:16:50,615 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:16:50,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 11 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:16:50,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 13:16:50,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-12-14 13:16:50,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:50,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2022-12-14 13:16:50,620 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 19 [2022-12-14 13:16:50,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:16:50,620 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2022-12-14 13:16:50,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:50,621 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2022-12-14 13:16:50,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 13:16:50,621 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:16:50,621 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:16:50,626 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 13:16:50,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:16:50,823 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:16:50,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:16:50,824 INFO L85 PathProgramCache]: Analyzing trace with hash 669056191, now seen corresponding path program 3 times [2022-12-14 13:16:50,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:16:50,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078955273] [2022-12-14 13:16:50,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:50,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:16:51,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:52,366 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:16:52,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:16:52,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078955273] [2022-12-14 13:16:52,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078955273] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:16:52,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067181136] [2022-12-14 13:16:52,367 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:16:52,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:16:52,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:16:52,368 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:16:52,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 13:16:52,422 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:16:52,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:16:52,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 13:16:52,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:16:52,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 13:16:53,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 14 [2022-12-14 13:16:53,233 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:16:53,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:16:54,149 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:16:54,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067181136] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:16:54,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1931466679] [2022-12-14 13:16:54,152 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:16:54,152 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:16:54,152 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:16:54,153 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:16:54,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:16:54,200 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:16:54,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:16:54,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:16:54,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:16:54,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:54,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:54,276 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:16:54,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:16:54,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:16:54,428 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:16:54,830 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '811#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:16:54,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:16:54,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:16:54,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 22] total 49 [2022-12-14 13:16:54,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285369932] [2022-12-14 13:16:54,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:16:54,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 13:16:54,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:16:54,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 13:16:54,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=2661, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 13:16:54,835 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 49 states, 49 states have (on average 1.3265306122448979) internal successors, (65), 49 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) [2022-12-14 13:16:56,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:16:56,082 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2022-12-14 13:16:56,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 13:16:56,082 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.3265306122448979) internal successors, (65), 49 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) Word has length 25 [2022-12-14 13:16:56,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:16:56,083 INFO L225 Difference]: With dead ends: 45 [2022-12-14 13:16:56,083 INFO L226 Difference]: Without dead ends: 42 [2022-12-14 13:16:56,085 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1116 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=335, Invalid=4221, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 13:16:56,085 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 886 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:16:56,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 59 Invalid, 913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 886 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 13:16:56,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-12-14 13:16:56,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2022-12-14 13:16:56,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:56,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2022-12-14 13:16:56,094 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 25 [2022-12-14 13:16:56,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:16:56,095 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2022-12-14 13:16:56,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.3265306122448979) internal successors, (65), 49 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) [2022-12-14 13:16:56,095 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2022-12-14 13:16:56,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 13:16:56,096 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:16:56,096 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:16:56,101 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 13:16:56,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:16:56,297 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:16:56,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:16:56,298 INFO L85 PathProgramCache]: Analyzing trace with hash 294022802, now seen corresponding path program 4 times [2022-12-14 13:16:56,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:16:56,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165898986] [2022-12-14 13:16:56,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:56,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:16:56,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:56,416 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:16:56,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:16:56,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165898986] [2022-12-14 13:16:56,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165898986] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:16:56,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443399313] [2022-12-14 13:16:56,416 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:16:56,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:16:56,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:16:56,417 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:16:56,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 13:16:56,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:56,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 13:16:56,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:16:56,512 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:16:56,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:16:56,541 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:16:56,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1443399313] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:16:56,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [646341042] [2022-12-14 13:16:56,543 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:16:56,544 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:16:56,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:16:56,544 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:16:56,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:16:56,586 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:16:56,586 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:16:56,595 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:16:56,610 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:16:56,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:56,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:56,656 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:16:56,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:16:56,698 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:16:56,809 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:16:56,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1164#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:16:56,961 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:16:56,961 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:16:56,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-12-14 13:16:56,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212463394] [2022-12-14 13:16:56,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:16:56,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 13:16:56,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:16:56,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 13:16:56,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2022-12-14 13:16:56,963 INFO L87 Difference]: Start difference. First operand 40 states and 51 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 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) [2022-12-14 13:16:57,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:16:57,103 INFO L93 Difference]: Finished difference Result 88 states and 113 transitions. [2022-12-14 13:16:57,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 13:16:57,104 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 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) Word has length 26 [2022-12-14 13:16:57,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:16:57,104 INFO L225 Difference]: With dead ends: 88 [2022-12-14 13:16:57,104 INFO L226 Difference]: Without dead ends: 51 [2022-12-14 13:16:57,104 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 63 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2022-12-14 13:16:57,105 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:16:57,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 15 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:16:57,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-12-14 13:16:57,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2022-12-14 13:16:57,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.255813953488372) internal successors, (54), 43 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:57,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2022-12-14 13:16:57,111 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 26 [2022-12-14 13:16:57,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:16:57,111 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2022-12-14 13:16:57,111 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 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) [2022-12-14 13:16:57,111 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2022-12-14 13:16:57,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 13:16:57,112 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:16:57,112 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:16:57,117 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 13:16:57,313 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 13:16:57,314 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:16:57,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:16:57,315 INFO L85 PathProgramCache]: Analyzing trace with hash 799982818, now seen corresponding path program 5 times [2022-12-14 13:16:57,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:16:57,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923446932] [2022-12-14 13:16:57,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:57,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:16:57,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:16:57,410 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 13:16:57,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:16:57,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923446932] [2022-12-14 13:16:57,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [923446932] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:16:57,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783697916] [2022-12-14 13:16:57,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:16:57,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:16:57,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:16:57,412 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:16:57,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 13:16:57,463 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:16:57,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:16:57,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 13:16:57,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:16:57,502 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 13:16:57,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:16:57,536 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 13:16:57,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783697916] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:16:57,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606843895] [2022-12-14 13:16:57,539 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:16:57,539 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:16:57,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:16:57,540 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:16:57,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:16:57,584 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:16:57,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:16:57,593 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:16:57,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:16:57,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:16:57,663 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:16:57,682 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:16:57,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:16:57,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:16:57,856 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:16:58,013 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1590#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:16:58,013 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:16:58,014 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:16:58,014 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-12-14 13:16:58,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550615176] [2022-12-14 13:16:58,014 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:16:58,014 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 13:16:58,014 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:16:58,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 13:16:58,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-12-14 13:16:58,015 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 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) [2022-12-14 13:16:58,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:16:58,144 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2022-12-14 13:16:58,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 13:16:58,144 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 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) Word has length 27 [2022-12-14 13:16:58,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:16:58,145 INFO L225 Difference]: With dead ends: 48 [2022-12-14 13:16:58,145 INFO L226 Difference]: Without dead ends: 33 [2022-12-14 13:16:58,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 65 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2022-12-14 13:16:58,146 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:16:58,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:16:58,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-12-14 13:16:58,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-12-14 13:16:58,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:16:58,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2022-12-14 13:16:58,154 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 27 [2022-12-14 13:16:58,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:16:58,155 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2022-12-14 13:16:58,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 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) [2022-12-14 13:16:58,155 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2022-12-14 13:16:58,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 13:16:58,156 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:16:58,156 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:16:58,160 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 13:16:58,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 13:16:58,357 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:16:58,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:16:58,358 INFO L85 PathProgramCache]: Analyzing trace with hash -760189627, now seen corresponding path program 6 times [2022-12-14 13:16:58,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:16:58,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11570302] [2022-12-14 13:16:58,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:16:58,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:16:58,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:01,280 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:17:01,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:17:01,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11570302] [2022-12-14 13:17:01,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11570302] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:17:01,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669980077] [2022-12-14 13:17:01,281 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:17:01,281 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:01,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:17:01,281 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:17:01,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 13:17:01,335 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:17:01,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:17:01,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 88 conjunts are in the unsatisfiable core [2022-12-14 13:17:01,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:17:02,518 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 3 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:17:02,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:17:04,177 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:17:04,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2022-12-14 13:17:04,328 INFO L321 Elim1Store]: treesize reduction 84, result has 13.4 percent of original size [2022-12-14 13:17:04,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2022-12-14 13:17:04,532 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:17:04,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1669980077] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:17:04,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1519815972] [2022-12-14 13:17:04,534 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:17:04,535 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:17:04,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:17:04,535 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:17:04,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:17:04,577 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:17:04,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:17:04,586 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:17:04,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:17:04,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:04,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:04,649 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:17:04,650 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:17:04,684 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:17:04,787 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:17:05,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2016#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:17:05,269 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:17:05,269 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:17:05,269 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 26, 27] total 76 [2022-12-14 13:17:05,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386758562] [2022-12-14 13:17:05,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:17:05,270 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-12-14 13:17:05,270 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:17:05,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-12-14 13:17:05,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=6179, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 13:17:05,274 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 76 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 76 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) [2022-12-14 13:17:13,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:17:13,636 INFO L93 Difference]: Finished difference Result 89 states and 112 transitions. [2022-12-14 13:17:13,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 13:17:13,636 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 76 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) Word has length 32 [2022-12-14 13:17:13,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:17:13,637 INFO L225 Difference]: With dead ends: 89 [2022-12-14 13:17:13,637 INFO L226 Difference]: Without dead ends: 73 [2022-12-14 13:17:13,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3043 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=1005, Invalid=14495, Unknown=0, NotChecked=0, Total=15500 [2022-12-14 13:17:13,639 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 94 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 2668 mSolverCounterSat, 480 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 3148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 480 IncrementalHoareTripleChecker+Valid, 2668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 13:17:13,639 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 169 Invalid, 3148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [480 Valid, 2668 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 13:17:13,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-12-14 13:17:13,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 58. [2022-12-14 13:17:13,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.2456140350877194) internal successors, (71), 57 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:17:13,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 71 transitions. [2022-12-14 13:17:13,658 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 71 transitions. Word has length 32 [2022-12-14 13:17:13,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:17:13,659 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 71 transitions. [2022-12-14 13:17:13,659 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 76 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) [2022-12-14 13:17:13,659 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 71 transitions. [2022-12-14 13:17:13,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 13:17:13,660 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:17:13,660 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:17:13,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-12-14 13:17:13,861 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:13,862 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:17:13,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:17:13,863 INFO L85 PathProgramCache]: Analyzing trace with hash -2091223540, now seen corresponding path program 7 times [2022-12-14 13:17:13,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:17:13,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939736523] [2022-12-14 13:17:13,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:17:13,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:17:13,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:13,964 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 13:17:13,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:17:13,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939736523] [2022-12-14 13:17:13,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939736523] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:17:13,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584832618] [2022-12-14 13:17:13,965 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:17:13,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:13,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:17:13,966 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:17:13,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 13:17:14,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:14,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 13:17:14,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:17:14,092 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 13:17:14,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:17:14,150 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 13:17:14,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584832618] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:17:14,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068628264] [2022-12-14 13:17:14,152 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:17:14,152 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:17:14,152 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:17:14,153 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:17:14,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:17:14,194 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:17:14,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:17:14,234 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:17:14,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:17:14,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:17:14,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:14,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:14,305 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:17:14,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:17:14,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:17:14,442 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:17:14,585 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2595#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:17:14,585 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:17:14,585 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:17:14,585 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-12-14 13:17:14,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402711269] [2022-12-14 13:17:14,585 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:17:14,586 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 13:17:14,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:17:14,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 13:17:14,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2022-12-14 13:17:14,587 INFO L87 Difference]: Start difference. First operand 58 states and 71 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:17:14,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:17:14,756 INFO L93 Difference]: Finished difference Result 117 states and 142 transitions. [2022-12-14 13:17:14,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 13:17:14,756 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-12-14 13:17:14,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:17:14,757 INFO L225 Difference]: With dead ends: 117 [2022-12-14 13:17:14,757 INFO L226 Difference]: Without dead ends: 54 [2022-12-14 13:17:14,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 80 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2022-12-14 13:17:14,758 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:17:14,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 15 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:17:14,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-12-14 13:17:14,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 47. [2022-12-14 13:17:14,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 46 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:17:14,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2022-12-14 13:17:14,769 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 33 [2022-12-14 13:17:14,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:17:14,769 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2022-12-14 13:17:14,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:17:14,770 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2022-12-14 13:17:14,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 13:17:14,770 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:17:14,770 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:17:14,775 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 13:17:14,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:14,972 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:17:14,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:17:14,973 INFO L85 PathProgramCache]: Analyzing trace with hash -49142131, now seen corresponding path program 8 times [2022-12-14 13:17:14,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:17:14,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90888781] [2022-12-14 13:17:14,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:17:14,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:17:15,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:15,096 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 13:17:15,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:17:15,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90888781] [2022-12-14 13:17:15,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90888781] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:17:15,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039789651] [2022-12-14 13:17:15,097 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:17:15,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:15,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:17:15,098 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:17:15,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 13:17:15,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:17:15,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:17:15,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 13:17:15,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:17:15,209 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 13:17:15,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:17:15,256 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 13:17:15,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039789651] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:17:15,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602912848] [2022-12-14 13:17:15,258 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:17:15,258 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:17:15,258 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:17:15,259 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:17:15,259 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:17:15,308 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:17:15,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:17:15,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:17:15,332 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:17:15,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:15,366 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:17:15,383 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:17:15,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:17:15,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:17:15,550 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:17:15,721 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3144#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:17:15,721 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:17:15,721 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:17:15,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-12-14 13:17:15,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507341929] [2022-12-14 13:17:15,722 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:17:15,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 13:17:15,722 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:17:15,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 13:17:15,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2022-12-14 13:17:15,723 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 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) [2022-12-14 13:17:15,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:17:15,882 INFO L93 Difference]: Finished difference Result 51 states and 59 transitions. [2022-12-14 13:17:15,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 13:17:15,883 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 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) Word has length 36 [2022-12-14 13:17:15,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:17:15,883 INFO L225 Difference]: With dead ends: 51 [2022-12-14 13:17:15,883 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 13:17:15,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 93 SyntacticMatches, 8 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=148, Invalid=608, Unknown=0, NotChecked=0, Total=756 [2022-12-14 13:17:15,884 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:17:15,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 9 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:17:15,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 13:17:15,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-12-14 13:17:15,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 39 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:17:15,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2022-12-14 13:17:15,895 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 36 [2022-12-14 13:17:15,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:17:15,895 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2022-12-14 13:17:15,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 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) [2022-12-14 13:17:15,895 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2022-12-14 13:17:15,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 13:17:15,896 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:17:15,896 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:17:15,900 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 13:17:16,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 13:17:16,097 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:17:16,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:17:16,097 INFO L85 PathProgramCache]: Analyzing trace with hash 110673983, now seen corresponding path program 9 times [2022-12-14 13:17:16,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:17:16,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113161165] [2022-12-14 13:17:16,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:17:16,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:17:16,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:20,552 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 1 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:17:20,553 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:17:20,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113161165] [2022-12-14 13:17:20,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113161165] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:17:20,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941574776] [2022-12-14 13:17:20,553 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:17:20,553 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:20,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:17:20,554 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:17:20,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 13:17:20,614 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:17:20,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:17:20,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 108 conjunts are in the unsatisfiable core [2022-12-14 13:17:20,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:17:22,475 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 13:17:22,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:17:25,214 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:17:25,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 185 [2022-12-14 13:17:25,629 INFO L321 Elim1Store]: treesize reduction 156, result has 9.8 percent of original size [2022-12-14 13:17:25,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 30 [2022-12-14 13:17:25,707 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 13:17:25,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [941574776] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:17:25,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635270620] [2022-12-14 13:17:25,709 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:17:25,709 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:17:25,709 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:17:25,709 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:17:25,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:17:25,749 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:17:25,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:17:25,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:17:25,771 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:17:25,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:25,805 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:17:25,820 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:17:25,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:17:25,859 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:17:25,946 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:17:26,486 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3653#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:17:26,486 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:17:26,486 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:17:26,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 30, 31] total 91 [2022-12-14 13:17:26,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173786794] [2022-12-14 13:17:26,487 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:17:26,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-12-14 13:17:26,487 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:17:26,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-12-14 13:17:26,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=8792, Unknown=0, NotChecked=0, Total=9120 [2022-12-14 13:17:26,493 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 91 states, 91 states have (on average 1.1538461538461537) internal successors, (105), 91 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) [2022-12-14 13:17:31,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:17:31,568 INFO L93 Difference]: Finished difference Result 126 states and 149 transitions. [2022-12-14 13:17:31,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-12-14 13:17:31,568 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.1538461538461537) internal successors, (105), 91 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 39 [2022-12-14 13:17:31,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:17:31,569 INFO L225 Difference]: With dead ends: 126 [2022-12-14 13:17:31,569 INFO L226 Difference]: Without dead ends: 96 [2022-12-14 13:17:31,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3568 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=593, Invalid=14169, Unknown=0, NotChecked=0, Total=14762 [2022-12-14 13:17:31,572 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 2688 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 2736 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 2688 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:17:31,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 121 Invalid, 2736 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 2688 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 13:17:31,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-12-14 13:17:31,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 68. [2022-12-14 13:17:31,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1940298507462686) internal successors, (80), 67 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) [2022-12-14 13:17:31,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2022-12-14 13:17:31,592 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 39 [2022-12-14 13:17:31,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:17:31,592 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2022-12-14 13:17:31,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 1.1538461538461537) internal successors, (105), 91 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) [2022-12-14 13:17:31,592 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2022-12-14 13:17:31,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 13:17:31,593 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:17:31,593 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:17:31,597 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 13:17:31,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 13:17:31,794 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:17:31,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:17:31,795 INFO L85 PathProgramCache]: Analyzing trace with hash 1890793717, now seen corresponding path program 10 times [2022-12-14 13:17:31,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:17:31,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561069827] [2022-12-14 13:17:31,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:17:31,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:17:31,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:31,920 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 13:17:31,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:17:31,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561069827] [2022-12-14 13:17:31,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561069827] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:17:31,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939962436] [2022-12-14 13:17:31,921 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:17:31,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:31,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:17:31,922 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:17:31,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 13:17:31,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:31,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 13:17:31,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:17:32,061 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 13:17:32,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:17:32,125 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 13:17:32,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939962436] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:17:32,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919631677] [2022-12-14 13:17:32,126 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:17:32,126 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:17:32,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:17:32,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:17:32,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:17:32,156 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:17:32,156 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:17:32,162 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:17:32,175 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:17:32,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:32,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:32,219 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:17:32,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:17:32,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:17:32,371 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:17:32,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4338#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:17:32,543 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:17:32,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:17:32,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 13:17:32,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610232877] [2022-12-14 13:17:32,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:17:32,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 13:17:32,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:17:32,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 13:17:32,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2022-12-14 13:17:32,544 INFO L87 Difference]: Start difference. First operand 68 states and 80 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 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) [2022-12-14 13:17:32,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:17:32,743 INFO L93 Difference]: Finished difference Result 127 states and 150 transitions. [2022-12-14 13:17:32,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 13:17:32,743 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 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 40 [2022-12-14 13:17:32,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:17:32,744 INFO L225 Difference]: With dead ends: 127 [2022-12-14 13:17:32,744 INFO L226 Difference]: Without dead ends: 73 [2022-12-14 13:17:32,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 98 SyntacticMatches, 10 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2022-12-14 13:17:32,744 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:17:32,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 17 Invalid, 426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:17:32,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-12-14 13:17:32,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 66. [2022-12-14 13:17:32,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 65 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:17:32,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2022-12-14 13:17:32,760 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 40 [2022-12-14 13:17:32,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:17:32,760 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2022-12-14 13:17:32,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 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) [2022-12-14 13:17:32,760 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2022-12-14 13:17:32,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 13:17:32,761 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:17:32,761 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:17:32,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 13:17:32,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:32,962 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:17:32,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:17:32,963 INFO L85 PathProgramCache]: Analyzing trace with hash 989785058, now seen corresponding path program 11 times [2022-12-14 13:17:32,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:17:32,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973462324] [2022-12-14 13:17:32,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:17:32,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:17:33,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:33,093 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 13:17:33,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:17:33,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973462324] [2022-12-14 13:17:33,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973462324] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:17:33,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956666780] [2022-12-14 13:17:33,093 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:17:33,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:33,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:17:33,094 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:17:33,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 13:17:33,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 13:17:33,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:17:33,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 13:17:33,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:17:33,227 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 13:17:33,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:17:33,291 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 13:17:33,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956666780] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:17:33,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1373691464] [2022-12-14 13:17:33,293 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:17:33,293 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:17:33,293 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:17:33,294 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:17:33,294 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:17:33,329 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:17:33,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:17:33,360 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:17:33,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:17:33,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:17:33,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:33,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:33,419 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:17:33,420 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:17:33,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:17:33,552 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:17:33,680 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4980#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:17:33,680 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:17:33,680 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:17:33,680 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 13:17:33,680 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795647703] [2022-12-14 13:17:33,680 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:17:33,681 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 13:17:33,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:17:33,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 13:17:33,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2022-12-14 13:17:33,682 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 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) [2022-12-14 13:17:33,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:17:33,862 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2022-12-14 13:17:33,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 13:17:33,863 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 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 41 [2022-12-14 13:17:33,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:17:33,863 INFO L225 Difference]: With dead ends: 70 [2022-12-14 13:17:33,863 INFO L226 Difference]: Without dead ends: 47 [2022-12-14 13:17:33,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 101 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2022-12-14 13:17:33,865 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:17:33,865 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 9 Invalid, 396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:17:33,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-12-14 13:17:33,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-12-14 13:17:33,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 46 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:17:33,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2022-12-14 13:17:33,884 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 41 [2022-12-14 13:17:33,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:17:33,884 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2022-12-14 13:17:33,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 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) [2022-12-14 13:17:33,884 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2022-12-14 13:17:33,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-12-14 13:17:33,885 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:17:33,885 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:17:33,890 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 13:17:34,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 13:17:34,086 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:17:34,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:17:34,087 INFO L85 PathProgramCache]: Analyzing trace with hash -1756344891, now seen corresponding path program 12 times [2022-12-14 13:17:34,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:17:34,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711117366] [2022-12-14 13:17:34,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:17:34,089 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:17:34,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:17:39,378 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 6 proven. 99 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:17:39,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:17:39,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711117366] [2022-12-14 13:17:39,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711117366] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:17:39,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [477460055] [2022-12-14 13:17:39,379 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:17:39,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:17:39,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:17:39,380 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:17:39,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 13:17:39,441 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:17:39,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:17:39,444 WARN L261 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 130 conjunts are in the unsatisfiable core [2022-12-14 13:17:39,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:17:41,869 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:17:41,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:17:46,289 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:17:46,290 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 285 [2022-12-14 13:17:47,350 INFO L321 Elim1Store]: treesize reduction 250, result has 7.7 percent of original size [2022-12-14 13:17:47,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 36 [2022-12-14 13:17:47,434 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:17:47,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [477460055] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:17:47,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [821482179] [2022-12-14 13:17:47,436 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:17:47,436 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:17:47,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:17:47,436 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:17:47,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:17:47,466 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:17:47,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:17:47,499 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:17:47,499 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:17:47,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:17:47,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:17:47,544 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:17:47,557 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:17:47,558 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:17:47,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:17:47,718 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:17:48,465 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5600#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:17:48,465 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:17:48,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:17:48,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 36, 37] total 110 [2022-12-14 13:17:48,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607127352] [2022-12-14 13:17:48,466 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:17:48,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2022-12-14 13:17:48,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:17:48,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2022-12-14 13:17:48,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=12720, Unknown=0, NotChecked=0, Total=13110 [2022-12-14 13:17:48,468 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 110 states, 110 states have (on average 1.1272727272727272) internal successors, (124), 110 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:18:06,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:18:06,762 INFO L93 Difference]: Finished difference Result 143 states and 165 transitions. [2022-12-14 13:18:06,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-12-14 13:18:06,762 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 1.1272727272727272) internal successors, (124), 110 states have internal predecessors, (124), 0 states have call successors, (0), 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 [2022-12-14 13:18:06,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:18:06,763 INFO L225 Difference]: With dead ends: 143 [2022-12-14 13:18:06,763 INFO L226 Difference]: Without dead ends: 139 [2022-12-14 13:18:06,766 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7467 ImplicationChecksByTransitivity, 24.0s TimeCoverageRelationStatistics Valid=1882, Invalid=32158, Unknown=0, NotChecked=0, Total=34040 [2022-12-14 13:18:06,766 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 109 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 4232 mSolverCounterSat, 604 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 4836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 604 IncrementalHoareTripleChecker+Valid, 4232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:18:06,766 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 333 Invalid, 4836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [604 Valid, 4232 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-12-14 13:18:06,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-12-14 13:18:06,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 74. [2022-12-14 13:18:06,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.178082191780822) internal successors, (86), 73 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:18:06,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 86 transitions. [2022-12-14 13:18:06,795 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 86 transitions. Word has length 46 [2022-12-14 13:18:06,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:18:06,795 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 86 transitions. [2022-12-14 13:18:06,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 1.1272727272727272) internal successors, (124), 110 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:18:06,795 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 86 transitions. [2022-12-14 13:18:06,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 13:18:06,796 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:18:06,796 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:18:06,800 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 13:18:06,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 13:18:06,997 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:18:06,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:18:06,998 INFO L85 PathProgramCache]: Analyzing trace with hash -2111710731, now seen corresponding path program 13 times [2022-12-14 13:18:06,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:18:06,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090760823] [2022-12-14 13:18:06,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:18:07,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:18:07,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:18:07,151 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-12-14 13:18:07,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:18:07,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090760823] [2022-12-14 13:18:07,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090760823] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:18:07,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758629360] [2022-12-14 13:18:07,151 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:18:07,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:18:07,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:18:07,152 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:18:07,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 13:18:07,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:18:07,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 13:18:07,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:18:07,295 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-12-14 13:18:07,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:18:07,358 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-12-14 13:18:07,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758629360] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:18:07,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [166892898] [2022-12-14 13:18:07,360 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:18:07,360 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:18:07,360 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:18:07,360 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:18:07,360 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:18:07,394 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:18:07,394 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:18:07,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:18:07,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:18:07,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:18:07,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:18:07,460 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:18:07,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:18:07,493 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:18:07,584 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:18:07,798 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6458#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:18:07,798 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:18:07,798 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:18:07,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-12-14 13:18:07,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555323146] [2022-12-14 13:18:07,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:18:07,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 13:18:07,799 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:18:07,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 13:18:07,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=599, Unknown=0, NotChecked=0, Total=756 [2022-12-14 13:18:07,800 INFO L87 Difference]: Start difference. First operand 74 states and 86 transitions. Second operand has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:18:08,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:18:08,090 INFO L93 Difference]: Finished difference Result 162 states and 189 transitions. [2022-12-14 13:18:08,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 13:18:08,090 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 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 [2022-12-14 13:18:08,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:18:08,091 INFO L225 Difference]: With dead ends: 162 [2022-12-14 13:18:08,091 INFO L226 Difference]: Without dead ends: 72 [2022-12-14 13:18:08,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 116 SyntacticMatches, 12 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=238, Invalid=884, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 13:18:08,092 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 66 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:18:08,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 17 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:18:08,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-12-14 13:18:08,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 65. [2022-12-14 13:18:08,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.140625) internal successors, (73), 64 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:18:08,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2022-12-14 13:18:08,121 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 47 [2022-12-14 13:18:08,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:18:08,122 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2022-12-14 13:18:08,122 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:18:08,122 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2022-12-14 13:18:08,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 13:18:08,122 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:18:08,122 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:18:08,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-12-14 13:18:08,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:18:08,323 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:18:08,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:18:08,324 INFO L85 PathProgramCache]: Analyzing trace with hash 774626701, now seen corresponding path program 14 times [2022-12-14 13:18:08,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:18:08,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490704377] [2022-12-14 13:18:08,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:18:08,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:18:08,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:18:08,477 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-12-14 13:18:08,477 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:18:08,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490704377] [2022-12-14 13:18:08,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490704377] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:18:08,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833410675] [2022-12-14 13:18:08,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:18:08,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:18:08,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:18:08,478 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:18:08,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 13:18:08,548 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 13:18:08,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:18:08,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 13:18:08,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:18:08,613 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-12-14 13:18:08,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:18:08,685 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-12-14 13:18:08,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833410675] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:18:08,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466750454] [2022-12-14 13:18:08,686 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:18:08,686 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:18:08,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:18:08,687 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:18:08,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:18:08,724 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:18:08,725 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:18:08,763 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:18:08,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:18:08,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:18:08,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:18:08,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:18:08,826 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:18:08,827 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:18:08,865 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:18:08,957 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:18:09,136 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7227#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:18:09,136 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:18:09,137 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:18:09,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-12-14 13:18:09,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517853671] [2022-12-14 13:18:09,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:18:09,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 13:18:09,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:18:09,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 13:18:09,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2022-12-14 13:18:09,138 INFO L87 Difference]: Start difference. First operand 65 states and 73 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) [2022-12-14 13:18:09,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:18:09,323 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2022-12-14 13:18:09,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 13:18:09,323 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 50 [2022-12-14 13:18:09,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:18:09,324 INFO L225 Difference]: With dead ends: 69 [2022-12-14 13:18:09,324 INFO L226 Difference]: Without dead ends: 54 [2022-12-14 13:18:09,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 131 SyntacticMatches, 12 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 13:18:09,325 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:18:09,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 15 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:18:09,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-12-14 13:18:09,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-12-14 13:18:09,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:18:09,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 60 transitions. [2022-12-14 13:18:09,346 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 60 transitions. Word has length 50 [2022-12-14 13:18:09,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:18:09,346 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 60 transitions. [2022-12-14 13:18:09,346 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) [2022-12-14 13:18:09,346 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 60 transitions. [2022-12-14 13:18:09,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-12-14 13:18:09,347 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:18:09,347 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:18:09,351 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 13:18:09,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 13:18:09,548 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:18:09,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:18:09,549 INFO L85 PathProgramCache]: Analyzing trace with hash -1094429761, now seen corresponding path program 15 times [2022-12-14 13:18:09,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:18:09,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013590045] [2022-12-14 13:18:09,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:18:09,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:18:09,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:18:17,468 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 9 proven. 138 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:18:17,468 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:18:17,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013590045] [2022-12-14 13:18:17,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013590045] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:18:17,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336262225] [2022-12-14 13:18:17,468 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:18:17,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:18:17,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:18:17,469 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:18:17,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 13:18:17,537 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:18:17,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:18:17,540 WARN L261 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 162 conjunts are in the unsatisfiable core [2022-12-14 13:18:17,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:18:21,675 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 6 proven. 126 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:18:21,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:18:28,670 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:18:28,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2022-12-14 13:18:31,895 INFO L321 Elim1Store]: treesize reduction 366, result has 6.4 percent of original size [2022-12-14 13:18:31,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2022-12-14 13:18:32,339 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 137 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 13:18:32,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336262225] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:18:32,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1768972115] [2022-12-14 13:18:32,341 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:18:32,341 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:18:32,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:18:32,341 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:18:32,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:18:32,375 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:18:32,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:18:32,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:18:32,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:18:32,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:18:32,426 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:18:32,444 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:18:32,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:18:32,478 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:18:32,561 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:18:33,286 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7933#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:18:33,286 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:18:33,287 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:18:33,287 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 44, 46] total 134 [2022-12-14 13:18:33,287 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988489431] [2022-12-14 13:18:33,287 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:18:33,287 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-12-14 13:18:33,287 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:18:33,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-12-14 13:18:33,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=674, Invalid=18508, Unknown=0, NotChecked=0, Total=19182 [2022-12-14 13:18:33,289 INFO L87 Difference]: Start difference. First operand 54 states and 60 transitions. Second operand has 134 states, 134 states have (on average 1.0895522388059702) internal successors, (146), 134 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) [2022-12-14 13:18:59,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:18:59,933 INFO L93 Difference]: Finished difference Result 139 states and 161 transitions. [2022-12-14 13:18:59,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-12-14 13:18:59,933 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 1.0895522388059702) internal successors, (146), 134 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 53 [2022-12-14 13:18:59,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:18:59,934 INFO L225 Difference]: With dead ends: 139 [2022-12-14 13:18:59,934 INFO L226 Difference]: Without dead ends: 114 [2022-12-14 13:18:59,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11727 ImplicationChecksByTransitivity, 35.9s TimeCoverageRelationStatistics Valid=2486, Invalid=42670, Unknown=0, NotChecked=0, Total=45156 [2022-12-14 13:18:59,936 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 102 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 6304 mSolverCounterSat, 843 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 7147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 843 IncrementalHoareTripleChecker+Valid, 6304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2022-12-14 13:18:59,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 280 Invalid, 7147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [843 Valid, 6304 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2022-12-14 13:18:59,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-12-14 13:18:59,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 94. [2022-12-14 13:18:59,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.1505376344086022) internal successors, (107), 93 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:18:59,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 107 transitions. [2022-12-14 13:18:59,985 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 107 transitions. Word has length 53 [2022-12-14 13:18:59,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:18:59,985 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 107 transitions. [2022-12-14 13:18:59,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 1.0895522388059702) internal successors, (146), 134 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) [2022-12-14 13:18:59,985 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 107 transitions. [2022-12-14 13:18:59,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 13:18:59,986 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:18:59,986 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:18:59,990 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 13:19:00,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 13:19:00,187 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:19:00,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:19:00,188 INFO L85 PathProgramCache]: Analyzing trace with hash 432234194, now seen corresponding path program 16 times [2022-12-14 13:19:00,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:19:00,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647902398] [2022-12-14 13:19:00,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:19:00,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:19:00,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:19:00,379 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-12-14 13:19:00,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:19:00,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647902398] [2022-12-14 13:19:00,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647902398] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:19:00,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970903485] [2022-12-14 13:19:00,379 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:19:00,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:19:00,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:19:00,380 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:19:00,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 13:19:00,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:19:00,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 13:19:00,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:19:00,570 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-12-14 13:19:00,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:19:00,659 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-12-14 13:19:00,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970903485] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:19:00,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1857405429] [2022-12-14 13:19:00,660 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:19:00,660 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:19:00,660 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:19:00,660 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:19:00,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:19:00,689 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:19:00,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:19:00,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:19:00,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:19:00,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:19:00,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:19:00,757 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:19:00,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:19:00,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:19:00,896 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:19:01,102 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8879#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:19:01,102 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:19:01,102 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:19:01,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-12-14 13:19:01,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067327334] [2022-12-14 13:19:01,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:19:01,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 13:19:01,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:19:01,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 13:19:01,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=737, Unknown=0, NotChecked=0, Total=930 [2022-12-14 13:19:01,104 INFO L87 Difference]: Start difference. First operand 94 states and 107 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 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) [2022-12-14 13:19:01,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:19:01,458 INFO L93 Difference]: Finished difference Result 186 states and 211 transitions. [2022-12-14 13:19:01,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 13:19:01,459 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 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) Word has length 54 [2022-12-14 13:19:01,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:19:01,459 INFO L225 Difference]: With dead ends: 186 [2022-12-14 13:19:01,459 INFO L226 Difference]: Without dead ends: 81 [2022-12-14 13:19:01,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 134 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=298, Invalid=1108, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 13:19:01,460 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 280 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:19:01,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 15 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [280 Valid, 342 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:19:01,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-12-14 13:19:01,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2022-12-14 13:19:01,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.1232876712328768) internal successors, (82), 73 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) [2022-12-14 13:19:01,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2022-12-14 13:19:01,500 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 54 [2022-12-14 13:19:01,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:19:01,500 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2022-12-14 13:19:01,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 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) [2022-12-14 13:19:01,500 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2022-12-14 13:19:01,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-12-14 13:19:01,501 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:19:01,501 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:19:01,505 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 13:19:01,702 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 13:19:01,702 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:19:01,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:19:01,704 INFO L85 PathProgramCache]: Analyzing trace with hash -952453241, now seen corresponding path program 17 times [2022-12-14 13:19:01,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:19:01,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661144359] [2022-12-14 13:19:01,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:19:01,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:19:01,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:19:01,889 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-12-14 13:19:01,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:19:01,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661144359] [2022-12-14 13:19:01,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661144359] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:19:01,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344078178] [2022-12-14 13:19:01,889 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:19:01,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:19:01,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:19:01,890 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:19:01,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 13:19:02,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 13:19:02,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:19:02,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 13:19:02,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:19:02,108 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-12-14 13:19:02,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:19:02,215 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-12-14 13:19:02,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344078178] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:19:02,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [766402524] [2022-12-14 13:19:02,217 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:19:02,217 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:19:02,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:19:02,217 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:19:02,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:19:02,256 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:19:02,257 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:19:02,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:19:02,281 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:19:02,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:19:02,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:19:02,324 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:19:02,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:19:02,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:19:02,446 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:19:02,604 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9761#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:19:02,604 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:19:02,604 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:19:02,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-12-14 13:19:02,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262291443] [2022-12-14 13:19:02,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:19:02,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 13:19:02,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:19:02,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 13:19:02,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2022-12-14 13:19:02,605 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 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) [2022-12-14 13:19:02,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:19:02,824 INFO L93 Difference]: Finished difference Result 78 states and 86 transitions. [2022-12-14 13:19:02,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 13:19:02,824 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 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) Word has length 57 [2022-12-14 13:19:02,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:19:02,824 INFO L225 Difference]: With dead ends: 78 [2022-12-14 13:19:02,824 INFO L226 Difference]: Without dead ends: 61 [2022-12-14 13:19:02,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 143 SyntacticMatches, 14 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 13:19:02,825 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 553 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:19:02,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 11 Invalid, 553 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:19:02,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-12-14 13:19:02,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-12-14 13:19:02,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:19:02,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2022-12-14 13:19:02,856 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 57 [2022-12-14 13:19:02,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:19:02,856 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2022-12-14 13:19:02,856 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 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) [2022-12-14 13:19:02,856 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2022-12-14 13:19:02,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 13:19:02,856 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:19:02,856 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:19:02,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 13:19:03,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:19:03,058 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:19:03,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:19:03,059 INFO L85 PathProgramCache]: Analyzing trace with hash -465347003, now seen corresponding path program 18 times [2022-12-14 13:19:03,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:19:03,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550900458] [2022-12-14 13:19:03,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:19:03,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:19:03,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:19:11,695 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 2 proven. 194 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:19:11,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:19:11,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550900458] [2022-12-14 13:19:11,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550900458] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:19:11,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207209450] [2022-12-14 13:19:11,695 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:19:11,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:19:11,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:19:11,696 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:19:11,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 13:19:11,773 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:19:11,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:19:11,777 WARN L261 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 178 conjunts are in the unsatisfiable core [2022-12-14 13:19:11,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:19:17,329 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 13:19:17,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:19:26,721 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:19:26,722 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 552 [2022-12-14 13:19:30,155 INFO L321 Elim1Store]: treesize reduction 504, result has 5.4 percent of original size [2022-12-14 13:19:30,156 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 47 [2022-12-14 13:19:30,323 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 13:19:30,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207209450] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:19:30,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1891690119] [2022-12-14 13:19:30,325 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:19:30,325 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:19:30,325 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:19:30,325 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:19:30,325 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:19:30,368 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:19:30,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:19:30,407 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:19:30,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:19:30,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:19:30,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:19:30,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:19:30,472 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:19:30,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:19:30,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:19:30,600 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:19:31,485 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10551#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:19:31,485 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:19:31,485 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:19:31,485 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 48, 49] total 148 [2022-12-14 13:19:31,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871625129] [2022-12-14 13:19:31,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:19:31,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2022-12-14 13:19:31,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:19:31,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2022-12-14 13:19:31,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=22674, Unknown=0, NotChecked=0, Total=23256 [2022-12-14 13:19:31,488 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 148 states, 148 states have (on average 1.0945945945945945) internal successors, (162), 148 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:19:59,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:19:59,841 INFO L93 Difference]: Finished difference Result 252 states and 284 transitions. [2022-12-14 13:19:59,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2022-12-14 13:19:59,841 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 1.0945945945945945) internal successors, (162), 148 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-12-14 13:19:59,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:19:59,842 INFO L225 Difference]: With dead ends: 252 [2022-12-14 13:19:59,842 INFO L226 Difference]: Without dead ends: 207 [2022-12-14 13:19:59,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12120 ImplicationChecksByTransitivity, 40.0s TimeCoverageRelationStatistics Valid=1845, Invalid=48107, Unknown=0, NotChecked=0, Total=49952 [2022-12-14 13:19:59,844 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 58 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 8262 mSolverCounterSat, 484 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 8746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 484 IncrementalHoareTripleChecker+Valid, 8262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:19:59,844 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 533 Invalid, 8746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [484 Valid, 8262 Invalid, 0 Unknown, 0 Unchecked, 6.4s Time] [2022-12-14 13:19:59,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-12-14 13:19:59,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 114. [2022-12-14 13:19:59,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.1327433628318584) internal successors, (128), 113 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:19:59,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 128 transitions. [2022-12-14 13:19:59,944 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 128 transitions. Word has length 60 [2022-12-14 13:19:59,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:19:59,944 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 128 transitions. [2022-12-14 13:19:59,944 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 1.0945945945945945) internal successors, (162), 148 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:19:59,944 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 128 transitions. [2022-12-14 13:19:59,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 13:19:59,945 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:19:59,945 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:19:59,949 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 13:20:00,145 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:20:00,146 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:20:00,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:20:00,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1830054325, now seen corresponding path program 19 times [2022-12-14 13:20:00,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:20:00,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524520916] [2022-12-14 13:20:00,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:20:00,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:20:00,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:20:00,344 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-12-14 13:20:00,345 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:20:00,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524520916] [2022-12-14 13:20:00,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [524520916] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:20:00,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133042837] [2022-12-14 13:20:00,345 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:20:00,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:20:00,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:20:00,346 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:20:00,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 13:20:00,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:20:00,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 13:20:00,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:20:00,553 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-12-14 13:20:00,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:20:00,653 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-12-14 13:20:00,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133042837] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:20:00,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [14422298] [2022-12-14 13:20:00,654 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:20:00,654 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:20:00,655 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:20:00,655 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:20:00,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:20:00,687 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:20:00,687 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:20:00,719 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:20:00,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:20:00,735 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:20:00,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:20:00,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:20:00,774 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:20:00,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:20:00,815 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:20:00,902 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:20:01,074 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11799#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:20:01,074 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:20:01,074 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:20:01,075 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-12-14 13:20:01,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947154060] [2022-12-14 13:20:01,075 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:20:01,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 13:20:01,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:20:01,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 13:20:01,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=889, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 13:20:01,076 INFO L87 Difference]: Start difference. First operand 114 states and 128 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 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) [2022-12-14 13:20:01,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:20:01,496 INFO L93 Difference]: Finished difference Result 200 states and 224 transitions. [2022-12-14 13:20:01,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 13:20:01,496 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 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) Word has length 61 [2022-12-14 13:20:01,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:20:01,496 INFO L225 Difference]: With dead ends: 200 [2022-12-14 13:20:01,496 INFO L226 Difference]: Without dead ends: 90 [2022-12-14 13:20:01,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 152 SyntacticMatches, 16 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=365, Invalid=1357, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 13:20:01,497 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:20:01,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 19 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 366 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:20:01,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-12-14 13:20:01,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 83. [2022-12-14 13:20:01,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1097560975609757) internal successors, (91), 82 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) [2022-12-14 13:20:01,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 91 transitions. [2022-12-14 13:20:01,553 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 91 transitions. Word has length 61 [2022-12-14 13:20:01,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:20:01,554 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 91 transitions. [2022-12-14 13:20:01,554 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 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) [2022-12-14 13:20:01,554 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 91 transitions. [2022-12-14 13:20:01,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-12-14 13:20:01,554 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:20:01,554 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:20:01,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-12-14 13:20:01,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:20:01,756 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:20:01,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:20:01,757 INFO L85 PathProgramCache]: Analyzing trace with hash -2035907443, now seen corresponding path program 20 times [2022-12-14 13:20:01,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:20:01,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142880454] [2022-12-14 13:20:01,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:20:01,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:20:01,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:20:01,975 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2022-12-14 13:20:01,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:20:01,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142880454] [2022-12-14 13:20:01,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142880454] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:20:01,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677438218] [2022-12-14 13:20:01,976 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:20:01,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:20:01,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:20:01,977 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:20:01,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 13:20:02,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 13:20:02,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:20:02,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 13:20:02,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:20:02,188 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2022-12-14 13:20:02,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:20:02,286 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2022-12-14 13:20:02,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677438218] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:20:02,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [384595567] [2022-12-14 13:20:02,287 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:20:02,288 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:20:02,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:20:02,288 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:20:02,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:20:02,323 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:20:02,323 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:20:02,361 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:20:02,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:20:02,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:20:02,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:20:02,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:20:02,418 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:20:02,418 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:20:02,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:20:02,536 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:20:02,691 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12774#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:20:02,691 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:20:02,691 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:20:02,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-12-14 13:20:02,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754697869] [2022-12-14 13:20:02,692 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:20:02,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 13:20:02,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:20:02,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 13:20:02,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 13:20:02,693 INFO L87 Difference]: Start difference. First operand 83 states and 91 transitions. Second operand has 29 states, 29 states have (on average 2.2758620689655173) internal successors, (66), 29 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:20:02,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:20:02,995 INFO L93 Difference]: Finished difference Result 87 states and 95 transitions. [2022-12-14 13:20:02,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 13:20:02,995 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.2758620689655173) internal successors, (66), 29 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-12-14 13:20:02,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:20:02,996 INFO L225 Difference]: With dead ends: 87 [2022-12-14 13:20:02,996 INFO L226 Difference]: Without dead ends: 68 [2022-12-14 13:20:02,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 169 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=366, Invalid=1526, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 13:20:02,997 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 522 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:20:02,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 15 Invalid, 704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 522 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:20:02,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-12-14 13:20:03,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-12-14 13:20:03,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:20:03,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2022-12-14 13:20:03,040 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 64 [2022-12-14 13:20:03,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:20:03,040 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2022-12-14 13:20:03,040 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.2758620689655173) internal successors, (66), 29 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:20:03,040 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2022-12-14 13:20:03,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 13:20:03,041 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:20:03,041 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:20:03,045 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 13:20:03,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 13:20:03,242 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:20:03,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:20:03,243 INFO L85 PathProgramCache]: Analyzing trace with hash 291223359, now seen corresponding path program 21 times [2022-12-14 13:20:03,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:20:03,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081169832] [2022-12-14 13:20:03,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:20:03,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:20:03,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:20:14,656 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 10 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:20:14,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:20:14,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081169832] [2022-12-14 13:20:14,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081169832] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:20:14,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711476202] [2022-12-14 13:20:14,656 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:20:14,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:20:14,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:20:14,657 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:20:14,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 13:20:14,765 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:20:14,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:20:14,769 WARN L261 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 204 conjunts are in the unsatisfiable core [2022-12-14 13:20:14,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:20:21,989 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 13:20:21,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:20:37,806 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:20:37,806 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 717 [2022-12-14 13:20:45,394 INFO L321 Elim1Store]: treesize reduction 664, result has 4.7 percent of original size [2022-12-14 13:20:45,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 54 [2022-12-14 13:20:45,585 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 13:20:45,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711476202] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:20:45,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1472723093] [2022-12-14 13:20:45,587 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:20:45,587 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:20:45,587 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:20:45,587 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:20:45,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:20:45,619 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:20:45,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:20:45,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:20:45,639 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:20:45,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:20:45,671 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:20:45,685 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:20:45,685 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:20:45,731 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:20:45,818 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:20:46,820 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13667#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:20:46,820 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:20:46,820 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:20:46,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 54, 55] total 167 [2022-12-14 13:20:46,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462699248] [2022-12-14 13:20:46,820 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:20:46,820 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2022-12-14 13:20:46,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:20:46,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2022-12-14 13:20:46,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=639, Invalid=28773, Unknown=0, NotChecked=0, Total=29412 [2022-12-14 13:20:46,822 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 167 states, 167 states have (on average 1.0838323353293413) internal successors, (181), 167 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:21:46,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:21:46,922 INFO L93 Difference]: Finished difference Result 258 states and 287 transitions. [2022-12-14 13:21:46,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2022-12-14 13:21:46,923 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 1.0838323353293413) internal successors, (181), 167 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2022-12-14 13:21:46,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:21:46,924 INFO L225 Difference]: With dead ends: 258 [2022-12-14 13:21:46,924 INFO L226 Difference]: Without dead ends: 236 [2022-12-14 13:21:46,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21118 ImplicationChecksByTransitivity, 79.4s TimeCoverageRelationStatistics Valid=3844, Invalid=93812, Unknown=0, NotChecked=0, Total=97656 [2022-12-14 13:21:46,928 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 52 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 8607 mSolverCounterSat, 861 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 9468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 861 IncrementalHoareTripleChecker+Valid, 8607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:21:46,928 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 553 Invalid, 9468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [861 Valid, 8607 Invalid, 0 Unknown, 0 Unchecked, 7.5s Time] [2022-12-14 13:21:46,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2022-12-14 13:21:47,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 117. [2022-12-14 13:21:47,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.1206896551724137) internal successors, (130), 116 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:21:47,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 130 transitions. [2022-12-14 13:21:47,030 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 130 transitions. Word has length 67 [2022-12-14 13:21:47,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:21:47,030 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 130 transitions. [2022-12-14 13:21:47,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 1.0838323353293413) internal successors, (181), 167 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:21:47,030 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 130 transitions. [2022-12-14 13:21:47,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-12-14 13:21:47,030 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:21:47,031 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:21:47,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-12-14 13:21:47,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:21:47,232 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:21:47,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:21:47,233 INFO L85 PathProgramCache]: Analyzing trace with hash -1641267339, now seen corresponding path program 22 times [2022-12-14 13:21:47,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:21:47,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478524516] [2022-12-14 13:21:47,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:21:47,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:21:47,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:21:47,452 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-12-14 13:21:47,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:21:47,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478524516] [2022-12-14 13:21:47,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478524516] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:21:47,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641665301] [2022-12-14 13:21:47,452 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:21:47,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:21:47,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:21:47,453 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:21:47,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 13:21:47,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:21:47,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 13:21:47,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:21:47,656 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-12-14 13:21:47,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:21:47,780 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-12-14 13:21:47,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641665301] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:21:47,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247084292] [2022-12-14 13:21:47,781 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:21:47,781 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:21:47,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:21:47,781 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:21:47,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:21:47,818 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:21:47,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:21:47,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:21:47,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:21:47,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:21:47,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:21:47,885 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:21:47,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:21:47,922 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:21:48,031 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:21:48,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15118#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:21:48,253 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:21:48,253 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:21:48,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-12-14 13:21:48,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991185330] [2022-12-14 13:21:48,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:21:48,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 13:21:48,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:21:48,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 13:21:48,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=1055, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 13:21:48,254 INFO L87 Difference]: Start difference. First operand 117 states and 130 transitions. Second operand has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 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) [2022-12-14 13:21:48,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:21:48,855 INFO L93 Difference]: Finished difference Result 231 states and 257 transitions. [2022-12-14 13:21:48,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 13:21:48,856 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 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 68 [2022-12-14 13:21:48,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:21:48,856 INFO L225 Difference]: With dead ends: 231 [2022-12-14 13:21:48,856 INFO L226 Difference]: Without dead ends: 99 [2022-12-14 13:21:48,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 170 SyntacticMatches, 18 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 904 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=439, Invalid=1631, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 13:21:48,857 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 432 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 432 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:21:48,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 15 Invalid, 846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [432 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:21:48,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-12-14 13:21:48,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2022-12-14 13:21:48,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.098901098901099) internal successors, (100), 91 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:21:48,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 100 transitions. [2022-12-14 13:21:48,938 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 100 transitions. Word has length 68 [2022-12-14 13:21:48,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:21:48,938 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 100 transitions. [2022-12-14 13:21:48,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 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) [2022-12-14 13:21:48,938 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 100 transitions. [2022-12-14 13:21:48,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 13:21:48,938 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:21:48,939 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:21:48,943 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 13:21:49,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 13:21:49,140 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:21:49,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:21:49,141 INFO L85 PathProgramCache]: Analyzing trace with hash 388931975, now seen corresponding path program 23 times [2022-12-14 13:21:49,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:21:49,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120675146] [2022-12-14 13:21:49,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:21:49,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:21:49,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:21:49,387 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-12-14 13:21:49,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:21:49,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120675146] [2022-12-14 13:21:49,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120675146] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:21:49,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483609862] [2022-12-14 13:21:49,388 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:21:49,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:21:49,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:21:49,389 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:21:49,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 13:21:49,513 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 13:21:49,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:21:49,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 13:21:49,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:21:49,646 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-12-14 13:21:49,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:21:49,797 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-12-14 13:21:49,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483609862] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:21:49,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1603181919] [2022-12-14 13:21:49,798 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:21:49,799 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:21:49,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:21:49,799 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:21:49,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:21:49,833 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:21:49,833 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:21:49,872 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:21:49,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:21:49,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:21:49,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:21:49,923 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:21:49,939 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:21:49,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:21:49,976 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:21:50,069 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:21:50,233 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16220#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:21:50,233 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:21:50,233 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:21:50,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-12-14 13:21:50,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326775174] [2022-12-14 13:21:50,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:21:50,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 13:21:50,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:21:50,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 13:21:50,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 13:21:50,235 INFO L87 Difference]: Start difference. First operand 92 states and 100 transitions. Second operand has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:21:50,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:21:50,615 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2022-12-14 13:21:50,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:21:50,615 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-12-14 13:21:50,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:21:50,616 INFO L225 Difference]: With dead ends: 96 [2022-12-14 13:21:50,616 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 13:21:50,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 180 SyntacticMatches, 18 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 13:21:50,616 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 354 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 354 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:21:50,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 11 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [354 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:21:50,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 13:21:50,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-12-14 13:21:50,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 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) [2022-12-14 13:21:50,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2022-12-14 13:21:50,679 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 71 [2022-12-14 13:21:50,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:21:50,679 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2022-12-14 13:21:50,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:21:50,679 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2022-12-14 13:21:50,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-12-14 13:21:50,680 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:21:50,680 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:21:50,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-12-14 13:21:50,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:21:50,881 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:21:50,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:21:50,882 INFO L85 PathProgramCache]: Analyzing trace with hash 701603525, now seen corresponding path program 24 times [2022-12-14 13:21:50,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:21:50,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743417278] [2022-12-14 13:21:50,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:21:50,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:21:51,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:22:05,729 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 15 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:22:05,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:22:05,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743417278] [2022-12-14 13:22:05,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [743417278] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:22:05,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745551614] [2022-12-14 13:22:05,729 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:22:05,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:22:05,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:22:05,730 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:22:05,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 13:22:05,827 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:22:05,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:22:05,831 WARN L261 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 226 conjunts are in the unsatisfiable core [2022-12-14 13:22:05,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:22:13,916 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 13:22:13,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:22:29,211 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:22:29,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 906 [2022-12-14 13:22:42,931 INFO L321 Elim1Store]: treesize reduction 846, result has 4.2 percent of original size [2022-12-14 13:22:42,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 59 [2022-12-14 13:22:43,104 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 13:22:43,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745551614] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:22:43,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [752383155] [2022-12-14 13:22:43,105 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:22:43,105 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:22:43,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:22:43,105 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:22:43,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:22:43,141 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:22:43,141 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:22:43,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:22:43,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:22:43,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:22:43,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:22:43,201 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:22:43,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:22:43,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:22:43,313 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:22:44,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17201#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:22:44,288 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:22:44,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:22:44,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 60, 61] total 186 [2022-12-14 13:22:44,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318129837] [2022-12-14 13:22:44,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:22:44,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 186 states [2022-12-14 13:22:44,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:22:44,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2022-12-14 13:22:44,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1218, Invalid=35072, Unknown=0, NotChecked=0, Total=36290 [2022-12-14 13:22:44,291 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 186 states, 186 states have (on average 1.075268817204301) internal successors, (200), 186 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:23:39,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:23:39,211 INFO L93 Difference]: Finished difference Result 395 states and 455 transitions. [2022-12-14 13:23:39,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2022-12-14 13:23:39,212 INFO L78 Accepts]: Start accepts. Automaton has has 186 states, 186 states have (on average 1.075268817204301) internal successors, (200), 186 states have internal predecessors, (200), 0 states have call successors, (0), 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 [2022-12-14 13:23:39,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:23:39,213 INFO L225 Difference]: With dead ends: 395 [2022-12-14 13:23:39,213 INFO L226 Difference]: Without dead ends: 371 [2022-12-14 13:23:39,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 326 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36250 ImplicationChecksByTransitivity, 72.8s TimeCoverageRelationStatistics Valid=5306, Invalid=101950, Unknown=0, NotChecked=0, Total=107256 [2022-12-14 13:23:39,217 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 61 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 9395 mSolverCounterSat, 1285 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 10680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1285 IncrementalHoareTripleChecker+Valid, 9395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.7s IncrementalHoareTripleChecker+Time [2022-12-14 13:23:39,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 314 Invalid, 10680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1285 Valid, 9395 Invalid, 0 Unknown, 0 Unchecked, 9.7s Time] [2022-12-14 13:23:39,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-12-14 13:23:39,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 135. [2022-12-14 13:23:39,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.1492537313432836) internal successors, (154), 134 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) [2022-12-14 13:23:39,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 154 transitions. [2022-12-14 13:23:39,371 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 154 transitions. Word has length 74 [2022-12-14 13:23:39,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:23:39,371 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 154 transitions. [2022-12-14 13:23:39,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 186 states, 186 states have (on average 1.075268817204301) internal successors, (200), 186 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:23:39,372 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 154 transitions. [2022-12-14 13:23:39,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-12-14 13:23:39,372 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:23:39,372 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:23:39,377 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 13:23:39,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:23:39,574 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:23:39,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:23:39,575 INFO L85 PathProgramCache]: Analyzing trace with hash 2074556789, now seen corresponding path program 25 times [2022-12-14 13:23:39,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:23:39,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653282837] [2022-12-14 13:23:39,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:23:39,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:23:39,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:23:39,866 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2022-12-14 13:23:39,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:23:39,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653282837] [2022-12-14 13:23:39,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653282837] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:23:39,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405750961] [2022-12-14 13:23:39,867 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:23:39,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:23:39,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:23:39,868 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:23:39,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 13:23:39,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:23:39,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 13:23:39,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:23:40,112 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2022-12-14 13:23:40,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:23:40,234 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2022-12-14 13:23:40,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405750961] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:23:40,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1681486747] [2022-12-14 13:23:40,235 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:23:40,235 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:23:40,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:23:40,236 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:23:40,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:23:40,268 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:23:40,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:23:40,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:23:40,290 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:23:40,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:23:40,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:23:40,330 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:23:40,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:23:40,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:23:40,456 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:23:40,663 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18996#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:23:40,663 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:23:40,663 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:23:40,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-12-14 13:23:40,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780297830] [2022-12-14 13:23:40,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:23:40,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 13:23:40,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:23:40,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 13:23:40,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1235, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 13:23:40,665 INFO L87 Difference]: Start difference. First operand 135 states and 154 transitions. Second operand has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:23:41,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:23:41,461 INFO L93 Difference]: Finished difference Result 348 states and 395 transitions. [2022-12-14 13:23:41,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 13:23:41,461 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 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 [2022-12-14 13:23:41,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:23:41,461 INFO L225 Difference]: With dead ends: 348 [2022-12-14 13:23:41,461 INFO L226 Difference]: Without dead ends: 155 [2022-12-14 13:23:41,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 188 SyntacticMatches, 20 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1079 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=520, Invalid=1930, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 13:23:41,462 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 398 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 398 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:23:41,462 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 21 Invalid, 846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [398 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:23:41,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-12-14 13:23:41,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 138. [2022-12-14 13:23:41,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.1240875912408759) internal successors, (154), 137 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) [2022-12-14 13:23:41,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 154 transitions. [2022-12-14 13:23:41,638 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 154 transitions. Word has length 75 [2022-12-14 13:23:41,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:23:41,638 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 154 transitions. [2022-12-14 13:23:41,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:23:41,638 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 154 transitions. [2022-12-14 13:23:41,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-12-14 13:23:41,638 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:23:41,638 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:23:41,642 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 13:23:41,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 13:23:41,840 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:23:41,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:23:41,841 INFO L85 PathProgramCache]: Analyzing trace with hash -852878451, now seen corresponding path program 26 times [2022-12-14 13:23:41,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:23:41,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625860637] [2022-12-14 13:23:41,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:23:41,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:23:41,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:23:42,110 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-12-14 13:23:42,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:23:42,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625860637] [2022-12-14 13:23:42,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625860637] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:23:42,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182703882] [2022-12-14 13:23:42,110 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:23:42,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:23:42,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:23:42,111 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:23:42,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 13:23:42,372 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 13:23:42,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:23:42,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 13:23:42,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:23:42,501 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-12-14 13:23:42,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:23:42,615 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-12-14 13:23:42,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182703882] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:23:42,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1080575308] [2022-12-14 13:23:42,616 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:23:42,616 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:23:42,616 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:23:42,616 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:23:42,617 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:23:42,644 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:23:42,644 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:23:42,674 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:23:42,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:23:42,687 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:23:42,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:23:42,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:23:42,729 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:23:42,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:23:42,770 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:23:42,865 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:23:43,036 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20471#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:23:43,036 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:23:43,036 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:23:43,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-12-14 13:23:43,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62904669] [2022-12-14 13:23:43,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:23:43,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 13:23:43,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:23:43,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 13:23:43,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1249, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 13:23:43,038 INFO L87 Difference]: Start difference. First operand 138 states and 154 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 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) [2022-12-14 13:23:43,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:23:43,514 INFO L93 Difference]: Finished difference Result 142 states and 158 transitions. [2022-12-14 13:23:43,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 13:23:43,515 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 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 78 [2022-12-14 13:23:43,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:23:43,515 INFO L225 Difference]: With dead ends: 142 [2022-12-14 13:23:43,515 INFO L226 Difference]: Without dead ends: 109 [2022-12-14 13:23:43,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 198 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=517, Invalid=2135, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 13:23:43,516 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 355 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 853 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 355 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:23:43,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 11 Invalid, 853 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [355 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:23:43,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-12-14 13:23:43,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 82. [2022-12-14 13:23:43,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0864197530864197) internal successors, (88), 81 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) [2022-12-14 13:23:43,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2022-12-14 13:23:43,620 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 78 [2022-12-14 13:23:43,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:23:43,621 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2022-12-14 13:23:43,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 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) [2022-12-14 13:23:43,621 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2022-12-14 13:23:43,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-12-14 13:23:43,621 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:23:43,621 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:23:43,626 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 13:23:43,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 13:23:43,822 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:23:43,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:23:43,823 INFO L85 PathProgramCache]: Analyzing trace with hash -329848129, now seen corresponding path program 27 times [2022-12-14 13:23:43,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:23:43,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685249945] [2022-12-14 13:23:43,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:23:43,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:23:43,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:02,115 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 13 proven. 372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:24:02,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:02,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685249945] [2022-12-14 13:24:02,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685249945] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:24:02,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614675033] [2022-12-14 13:24:02,115 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:24:02,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:02,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:02,116 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:02,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 13:24:02,236 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:24:02,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:24:02,241 WARN L261 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 250 conjunts are in the unsatisfiable core [2022-12-14 13:24:02,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:13,471 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 13:24:13,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:24:33,709 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:24:33,709 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 1115 [2022-12-14 13:24:49,712 INFO L321 Elim1Store]: treesize reduction 1050, result has 3.8 percent of original size [2022-12-14 13:24:49,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 66 [2022-12-14 13:24:49,926 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 13:24:49,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1614675033] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:24:49,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1863443194] [2022-12-14 13:24:49,927 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:24:49,927 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:24:49,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:24:49,927 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:24:49,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:24:49,957 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:24:49,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:24:49,988 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:24:49,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:24:50,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:24:50,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:24:50,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:24:50,041 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:24:50,041 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:24:50,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:24:50,205 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:24:51,259 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21621#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:24:51,259 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:24:51,260 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:24:51,260 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 66, 67] total 205 [2022-12-14 13:24:51,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878220837] [2022-12-14 13:24:51,260 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:24:51,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 205 states [2022-12-14 13:24:51,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:51,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2022-12-14 13:24:51,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1106, Invalid=42784, Unknown=0, NotChecked=0, Total=43890 [2022-12-14 13:24:51,263 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 205 states, 205 states have (on average 1.0682926829268293) internal successors, (219), 205 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:26:00,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:26:00,850 INFO L93 Difference]: Finished difference Result 425 states and 478 transitions. [2022-12-14 13:26:00,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 225 states. [2022-12-14 13:26:00,851 INFO L78 Accepts]: Start accepts. Automaton has has 205 states, 205 states have (on average 1.0682926829268293) internal successors, (219), 205 states have internal predecessors, (219), 0 states have call successors, (0), 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 81 [2022-12-14 13:26:00,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:26:00,852 INFO L225 Difference]: With dead ends: 425 [2022-12-14 13:26:00,852 INFO L226 Difference]: Without dead ends: 399 [2022-12-14 13:26:00,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 459 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 346 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37109 ImplicationChecksByTransitivity, 93.2s TimeCoverageRelationStatistics Valid=4900, Invalid=115856, Unknown=0, NotChecked=0, Total=120756 [2022-12-14 13:26:00,856 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 36 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 12481 mSolverCounterSat, 993 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 13474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 993 IncrementalHoareTripleChecker+Valid, 12481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:26:00,856 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 426 Invalid, 13474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [993 Valid, 12481 Invalid, 0 Unknown, 0 Unchecked, 12.6s Time] [2022-12-14 13:26:00,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2022-12-14 13:26:01,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 145. [2022-12-14 13:26:01,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.125) internal successors, (162), 144 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:26:01,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 162 transitions. [2022-12-14 13:26:01,110 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 162 transitions. Word has length 81 [2022-12-14 13:26:01,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:26:01,111 INFO L495 AbstractCegarLoop]: Abstraction has 145 states and 162 transitions. [2022-12-14 13:26:01,111 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 205 states, 205 states have (on average 1.0682926829268293) internal successors, (219), 205 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:26:01,111 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 162 transitions. [2022-12-14 13:26:01,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 13:26:01,111 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:26:01,111 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:26:01,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-12-14 13:26:01,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:26:01,313 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:26:01,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:26:01,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1148199605, now seen corresponding path program 28 times [2022-12-14 13:26:01,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:26:01,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170207492] [2022-12-14 13:26:01,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:26:01,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:26:01,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:26:01,629 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2022-12-14 13:26:01,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:26:01,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170207492] [2022-12-14 13:26:01,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170207492] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:26:01,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329039734] [2022-12-14 13:26:01,630 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:26:01,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:26:01,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:26:01,630 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:26:01,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 13:26:01,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:26:01,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 13:26:01,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:26:01,952 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2022-12-14 13:26:01,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:26:02,151 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2022-12-14 13:26:02,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329039734] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:26:02,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [785774321] [2022-12-14 13:26:02,152 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:26:02,152 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:26:02,152 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:26:02,152 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:26:02,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:26:02,195 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:26:02,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:26:02,236 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:26:02,236 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:26:02,256 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:26:02,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:26:02,292 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:26:02,311 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:26:02,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:26:02,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:26:02,476 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:26:02,717 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23543#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:26:02,717 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:26:02,717 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:26:02,717 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-12-14 13:26:02,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227542425] [2022-12-14 13:26:02,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:26:02,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 13:26:02,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:26:02,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 13:26:02,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=1429, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 13:26:02,718 INFO L87 Difference]: Start difference. First operand 145 states and 162 transitions. Second operand has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:26:03,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:26:03,571 INFO L93 Difference]: Finished difference Result 375 states and 418 transitions. [2022-12-14 13:26:03,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 13:26:03,571 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2022-12-14 13:26:03,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:26:03,572 INFO L225 Difference]: With dead ends: 375 [2022-12-14 13:26:03,572 INFO L226 Difference]: Without dead ends: 166 [2022-12-14 13:26:03,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 206 SyntacticMatches, 22 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1269 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=608, Invalid=2254, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 13:26:03,573 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 75 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 566 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 964 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 566 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:26:03,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 19 Invalid, 964 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [566 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:26:03,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-12-14 13:26:03,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 148. [2022-12-14 13:26:03,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.1020408163265305) internal successors, (162), 147 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:26:03,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 162 transitions. [2022-12-14 13:26:03,832 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 162 transitions. Word has length 82 [2022-12-14 13:26:03,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:26:03,832 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 162 transitions. [2022-12-14 13:26:03,832 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:26:03,832 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 162 transitions. [2022-12-14 13:26:03,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-12-14 13:26:03,832 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:26:03,832 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:26:03,836 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-12-14 13:26:04,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:26:04,034 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:26:04,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:26:04,035 INFO L85 PathProgramCache]: Analyzing trace with hash 1775246215, now seen corresponding path program 29 times [2022-12-14 13:26:04,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:26:04,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730508995] [2022-12-14 13:26:04,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:26:04,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:26:04,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:26:04,314 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2022-12-14 13:26:04,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:26:04,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730508995] [2022-12-14 13:26:04,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730508995] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:26:04,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662436169] [2022-12-14 13:26:04,315 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:26:04,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:26:04,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:26:04,316 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:26:04,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 13:26:04,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 13:26:04,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:26:04,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 13:26:04,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:26:04,757 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2022-12-14 13:26:04,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:26:04,933 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2022-12-14 13:26:04,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662436169] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:26:04,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1603708726] [2022-12-14 13:26:04,934 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:26:04,934 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:26:04,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:26:04,935 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:26:04,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:26:04,964 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 13:26:04,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-12-14 13:26:04,993 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:26:04,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:26:05,007 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:26:05,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:26:05,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:26:05,052 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:26:05,053 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:26:05,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:26:05,181 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:26:05,398 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25139#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:26:05,398 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:26:05,398 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:26:05,398 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-12-14 13:26:05,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103978718] [2022-12-14 13:26:05,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:26:05,399 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 13:26:05,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:26:05,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 13:26:05,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1445, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 13:26:05,400 INFO L87 Difference]: Start difference. First operand 148 states and 162 transitions. Second operand has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 38 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) [2022-12-14 13:26:06,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:26:06,143 INFO L93 Difference]: Finished difference Result 152 states and 166 transitions. [2022-12-14 13:26:06,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 13:26:06,143 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 38 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 85 [2022-12-14 13:26:06,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:26:06,144 INFO L225 Difference]: With dead ends: 152 [2022-12-14 13:26:06,144 INFO L226 Difference]: Without dead ends: 116 [2022-12-14 13:26:06,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 216 SyntacticMatches, 22 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1468 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 13:26:06,145 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 365 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 959 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 365 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:26:06,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 959 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [365 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:26:06,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-12-14 13:26:06,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 89. [2022-12-14 13:26:06,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:26:06,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2022-12-14 13:26:06,292 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 85 [2022-12-14 13:26:06,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:26:06,292 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2022-12-14 13:26:06,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 38 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) [2022-12-14 13:26:06,292 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2022-12-14 13:26:06,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-12-14 13:26:06,292 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:26:06,292 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:26:06,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-12-14 13:26:06,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:26:06,494 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:26:06,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:26:06,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1799556933, now seen corresponding path program 30 times [2022-12-14 13:26:06,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:26:06,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764174626] [2022-12-14 13:26:06,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:26:06,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:26:06,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:26:29,189 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 64 proven. 398 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:26:29,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:26:29,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764174626] [2022-12-14 13:26:29,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764174626] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:26:29,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162908363] [2022-12-14 13:26:29,190 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:26:29,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:26:29,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:26:29,191 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:26:29,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 13:26:29,331 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:26:29,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:26:29,336 WARN L261 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 274 conjunts are in the unsatisfiable core [2022-12-14 13:26:29,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:26:44,512 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 13:26:44,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:14,270 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 13:27:14,270 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 1347 [2022-12-14 13:28:00,870 INFO L321 Elim1Store]: treesize reduction 1276, result has 3.4 percent of original size [2022-12-14 13:28:00,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 189 treesize of output 72 [2022-12-14 13:28:01,136 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 13:28:01,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162908363] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:01,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1216527270] [2022-12-14 13:28:01,137 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:28:01,137 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:01,137 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:01,137 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:01,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:01,166 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:28:01,166 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:28:01,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:28:01,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:28:01,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:28:01,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:28:01,223 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:28:01,224 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:28:01,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:28:01,352 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:02,832 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26386#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:28:02,832 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:02,832 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:28:02,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 72, 73] total 224 [2022-12-14 13:28:02,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026940608] [2022-12-14 13:28:02,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:02,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 224 states [2022-12-14 13:28:02,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:02,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 224 interpolants. [2022-12-14 13:28:02,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=51167, Unknown=0, NotChecked=0, Total=52212 [2022-12-14 13:28:02,836 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand has 224 states, 224 states have (on average 1.0625) internal successors, (238), 224 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) [2022-12-14 13:29:49,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:49,277 INFO L93 Difference]: Finished difference Result 348 states and 456 transitions. [2022-12-14 13:29:49,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2022-12-14 13:29:49,278 INFO L78 Accepts]: Start accepts. Automaton has has 224 states, 224 states have (on average 1.0625) internal successors, (238), 224 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 88 [2022-12-14 13:29:49,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:49,279 INFO L225 Difference]: With dead ends: 348 [2022-12-14 13:29:49,279 INFO L226 Difference]: Without dead ends: 344 [2022-12-14 13:29:49,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 371 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36997 ImplicationChecksByTransitivity, 137.0s TimeCoverageRelationStatistics Valid=5833, Invalid=132923, Unknown=0, NotChecked=0, Total=138756 [2022-12-14 13:29:49,284 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 227 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 16614 mSolverCounterSat, 2511 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 19125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2511 IncrementalHoareTripleChecker+Valid, 16614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:49,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 481 Invalid, 19125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2511 Valid, 16614 Invalid, 0 Unknown, 0 Unchecked, 20.1s Time] [2022-12-14 13:29:49,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2022-12-14 13:29:49,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 155. [2022-12-14 13:29:49,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.1818181818181819) internal successors, (182), 154 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) [2022-12-14 13:29:49,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 182 transitions. [2022-12-14 13:29:49,587 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 182 transitions. Word has length 88 [2022-12-14 13:29:49,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:49,587 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 182 transitions. [2022-12-14 13:29:49,587 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 224 states, 224 states have (on average 1.0625) internal successors, (238), 224 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) [2022-12-14 13:29:49,587 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 182 transitions. [2022-12-14 13:29:49,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-12-14 13:29:49,588 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:49,588 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:49,592 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 13:29:49,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:49,789 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:49,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:49,790 INFO L85 PathProgramCache]: Analyzing trace with hash -48491508, now seen corresponding path program 31 times [2022-12-14 13:29:49,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:49,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345042567] [2022-12-14 13:29:49,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:49,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:49,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:50,169 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 13:29:50,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:29:50,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345042567] [2022-12-14 13:29:50,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [345042567] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:29:50,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482687550] [2022-12-14 13:29:50,169 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:29:50,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:50,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:29:50,170 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:29:50,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 13:29:50,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:50,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:29:50,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:29:50,589 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 13:29:50,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:29:50,837 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 13:29:50,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482687550] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:29:50,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [88274799] [2022-12-14 13:29:50,838 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:29:50,838 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:29:50,838 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:29:50,838 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:29:50,838 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:29:50,879 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:29:50,879 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:29:50,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:29:50,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:29:50,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:29:50,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:29:50,947 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:29:50,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:29:50,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:29:51,068 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:29:51,355 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28234#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:29:51,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:29:51,355 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:29:51,355 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-12-14 13:29:51,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742747337] [2022-12-14 13:29:51,355 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:29:51,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 13:29:51,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:29:51,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 13:29:51,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=1637, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 13:29:51,357 INFO L87 Difference]: Start difference. First operand 155 states and 182 transitions. Second operand has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 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) [2022-12-14 13:29:52,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:52,820 INFO L93 Difference]: Finished difference Result 379 states and 441 transitions. [2022-12-14 13:29:52,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 13:29:52,821 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 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 89 [2022-12-14 13:29:52,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:52,822 INFO L225 Difference]: With dead ends: 379 [2022-12-14 13:29:52,822 INFO L226 Difference]: Without dead ends: 178 [2022-12-14 13:29:52,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 224 SyntacticMatches, 24 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1474 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=703, Invalid=2603, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 13:29:52,823 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 791 mSolverCounterSat, 365 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 1156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 365 IncrementalHoareTripleChecker+Valid, 791 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:52,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 33 Invalid, 1156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [365 Valid, 791 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 13:29:52,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-12-14 13:29:53,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 171. [2022-12-14 13:29:53,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.1529411764705881) internal successors, (196), 170 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) [2022-12-14 13:29:53,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 196 transitions. [2022-12-14 13:29:53,166 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 196 transitions. Word has length 89 [2022-12-14 13:29:53,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:53,166 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 196 transitions. [2022-12-14 13:29:53,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 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) [2022-12-14 13:29:53,166 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 196 transitions. [2022-12-14 13:29:53,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-12-14 13:29:53,167 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:53,167 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:53,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-12-14 13:29:53,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-12-14 13:29:53,368 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:53,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:53,368 INFO L85 PathProgramCache]: Analyzing trace with hash 727622285, now seen corresponding path program 32 times [2022-12-14 13:29:53,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:53,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650392490] [2022-12-14 13:29:53,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:53,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:53,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:29:53,782 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2022-12-14 13:29:53,782 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:29:53,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650392490] [2022-12-14 13:29:53,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650392490] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:29:53,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315026246] [2022-12-14 13:29:53,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:29:53,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:53,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:29:53,783 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:29:53,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 13:29:53,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 13:29:53,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:29:53,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:29:53,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:29:54,189 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2022-12-14 13:29:54,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:29:54,400 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2022-12-14 13:29:54,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315026246] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:29:54,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [217588892] [2022-12-14 13:29:54,401 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:29:54,401 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:29:54,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:29:54,401 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:29:54,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:29:54,431 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:29:54,431 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:29:54,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:29:54,450 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 13:29:54,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:29:54,482 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 13:29:54,498 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 13:29:54,499 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 13:29:54,536 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:29:54,647 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:29:54,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29931#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:29:54,878 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:29:54,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:29:54,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-12-14 13:29:54,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147603758] [2022-12-14 13:29:54,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:29:54,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 13:29:54,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:29:54,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 13:29:54,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1655, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 13:29:54,880 INFO L87 Difference]: Start difference. First operand 171 states and 196 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 41 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:55,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:55,610 INFO L93 Difference]: Finished difference Result 175 states and 200 transitions. [2022-12-14 13:29:55,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 13:29:55,610 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 41 states have internal predecessors, (86), 0 states have call successors, (0), 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 92 [2022-12-14 13:29:55,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:55,611 INFO L225 Difference]: With dead ends: 175 [2022-12-14 13:29:55,611 INFO L226 Difference]: Without dead ends: 136 [2022-12-14 13:29:55,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 245 SyntacticMatches, 24 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=696, Invalid=2844, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 13:29:55,612 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 621 mSolverCounterSat, 356 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 356 IncrementalHoareTripleChecker+Valid, 621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:55,612 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [356 Valid, 621 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:29:55,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-12-14 13:29:55,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2022-12-14 13:29:55,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0736842105263158) internal successors, (102), 95 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:55,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 102 transitions. [2022-12-14 13:29:55,803 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 102 transitions. Word has length 92 [2022-12-14 13:29:55,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:55,803 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 102 transitions. [2022-12-14 13:29:55,803 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 41 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:29:55,803 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 102 transitions. [2022-12-14 13:29:55,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-12-14 13:29:55,804 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:55,804 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:55,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-12-14 13:29:56,004 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:56,005 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:56,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:56,006 INFO L85 PathProgramCache]: Analyzing trace with hash -357700033, now seen corresponding path program 33 times [2022-12-14 13:29:56,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:56,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054294079] [2022-12-14 13:29:56,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:56,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:56,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:27,015 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 36 proven. 510 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:30:27,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:30:27,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054294079] [2022-12-14 13:30:27,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1054294079] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:30:27,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309023944] [2022-12-14 13:30:27,015 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:30:27,015 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:27,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:30:27,016 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:30:27,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_375f3a4a-45d3-4ca6-bd5d-496a7a6f36d5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 13:30:27,209 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:30:27,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:30:27,214 WARN L261 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 302 conjunts are in the unsatisfiable core [2022-12-14 13:30:27,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:30:27,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 13:30:47,515 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 468 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 13:30:47,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:31:19,300 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 468 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 13:31:19,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309023944] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:31:19,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [84305709] [2022-12-14 13:31:19,301 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 13:31:19,301 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:31:19,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:31:19,301 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:31:19,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:31:19,341 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 13:31:19,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 13:31:19,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 13:31:19,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 13:31:19,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:31:19,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:31:19,413 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 13:31:19,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 13:31:19,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 13:31:19,546 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:31:21,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31312#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:31:21,613 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:31:21,613 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:31:21,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 78, 79] total 243 [2022-12-14 13:31:21,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3416399] [2022-12-14 13:31:21,614 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:31:21,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 243 states [2022-12-14 13:31:21,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:31:21,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 243 interpolants. [2022-12-14 13:31:21,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1315, Invalid=59941, Unknown=0, NotChecked=0, Total=61256 [2022-12-14 13:31:21,618 INFO L87 Difference]: Start difference. First operand 96 states and 102 transitions. Second operand has 243 states, 243 states have (on average 1.0576131687242798) internal successors, (257), 243 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)