./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW --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 30a4b942034eaa47a8fcc8fdf4549d1d63a9a60d59b585da2a353c9626604750 --- 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-4e7fbc6 [2022-11-23 14:41:12,332 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:41:12,335 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:41:12,374 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:41:12,374 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:41:12,378 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:41:12,381 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:41:12,384 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:41:12,388 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:41:12,391 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:41:12,391 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:41:12,393 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:41:12,393 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:41:12,398 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:41:12,400 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:41:12,401 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:41:12,403 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:41:12,405 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:41:12,407 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:41:12,414 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:41:12,415 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:41:12,419 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:41:12,421 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:41:12,422 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:41:12,428 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:41:12,428 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:41:12,429 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:41:12,430 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:41:12,430 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:41:12,431 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:41:12,431 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:41:12,432 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:41:12,433 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:41:12,434 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:41:12,434 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:41:12,435 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:41:12,435 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:41:12,436 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:41:12,436 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:41:12,437 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:41:12,446 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:41:12,448 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:41:12,478 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:41:12,479 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:41:12,479 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:41:12,480 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:41:12,480 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:41:12,481 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:41:12,481 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:41:12,481 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:41:12,481 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:41:12,481 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:41:12,482 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:41:12,483 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:41:12,483 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:41:12,483 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:41:12,483 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:41:12,483 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:41:12,484 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:41:12,484 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:41:12,484 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:41:12,485 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:41:12,485 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:41:12,485 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:41:12,485 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:41:12,485 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:41:12,486 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:41:12,486 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:41:12,486 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:41:12,487 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:41:12,487 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:41:12,487 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:41:12,487 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:41:12,488 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:41:12,488 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:41:12,488 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:41:12,488 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:41:12,488 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:41:12,489 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:41:12,489 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:41:12,490 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:41:12,490 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:41:12,490 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:41:12,491 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_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 30a4b942034eaa47a8fcc8fdf4549d1d63a9a60d59b585da2a353c9626604750 [2022-11-23 14:41:12,812 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:41:12,845 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:41:12,848 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:41:12,849 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:41:12,849 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:41:12,850 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2022-11-23 14:41:15,842 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:41:16,044 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:41:16,044 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2022-11-23 14:41:16,052 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/data/6629bcf68/f35bbd0c7efd44fcb65e75a3e35077a7/FLAG2a46e1bca [2022-11-23 14:41:16,074 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/data/6629bcf68/f35bbd0c7efd44fcb65e75a3e35077a7 [2022-11-23 14:41:16,080 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:41:16,082 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:41:16,087 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:41:16,087 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:41:16,093 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:41:16,094 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,096 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c196638 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16, skipping insertion in model container [2022-11-23 14:41:16,096 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,105 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:41:16,124 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:41:16,328 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_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/sv-benchmarks/c/loop-invgen/string_concat-noarr.i[893,906] [2022-11-23 14:41:16,350 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:41:16,363 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:41:16,376 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_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/sv-benchmarks/c/loop-invgen/string_concat-noarr.i[893,906] [2022-11-23 14:41:16,379 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:41:16,395 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:41:16,396 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16 WrapperNode [2022-11-23 14:41:16,396 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:41:16,397 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:41:16,397 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:41:16,398 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:41:16,403 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,409 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,427 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 53 [2022-11-23 14:41:16,429 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:41:16,430 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:41:16,430 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:41:16,430 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:41:16,440 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,441 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,444 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,444 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,453 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,457 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,458 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,459 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,460 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:41:16,461 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:41:16,462 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:41:16,462 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:41:16,463 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (1/1) ... [2022-11-23 14:41:16,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:41:16,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:41:16,508 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:41:16,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:41:16,553 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:41:16,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:41:16,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:41:16,553 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:41:16,629 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:41:16,631 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:41:16,769 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:41:16,785 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:41:16,785 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-23 14:41:16,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:41:16 BoogieIcfgContainer [2022-11-23 14:41:16,788 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:41:16,790 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:41:16,790 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:41:16,794 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:41:16,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:41:16" (1/3) ... [2022-11-23 14:41:16,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@573f86c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:41:16, skipping insertion in model container [2022-11-23 14:41:16,796 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:41:16" (2/3) ... [2022-11-23 14:41:16,796 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@573f86c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:41:16, skipping insertion in model container [2022-11-23 14:41:16,796 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:41:16" (3/3) ... [2022-11-23 14:41:16,798 INFO L112 eAbstractionObserver]: Analyzing ICFG string_concat-noarr.i [2022-11-23 14:41:16,818 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:41:16,819 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:41:16,901 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:41:16,907 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;@7e33bc25, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:41:16,908 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:41:16,912 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) 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) [2022-11-23 14:41:16,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:41:16,918 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:16,919 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:16,919 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:16,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:16,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1248656439, now seen corresponding path program 1 times [2022-11-23 14:41:16,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:16,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779148749] [2022-11-23 14:41:16,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:16,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:17,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:17,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:17,082 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:17,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779148749] [2022-11-23 14:41:17,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779148749] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:41:17,084 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:41:17,084 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:41:17,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765306078] [2022-11-23 14:41:17,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:41:17,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 14:41:17,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:17,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 14:41:17,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:41:17,139 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) 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) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:17,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:41:17,175 INFO L93 Difference]: Finished difference Result 23 states and 33 transitions. [2022-11-23 14:41:17,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 14:41:17,179 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-23 14:41:17,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:41:17,187 INFO L225 Difference]: With dead ends: 23 [2022-11-23 14:41:17,187 INFO L226 Difference]: Without dead ends: 10 [2022-11-23 14:41:17,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:41:17,196 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:41:17,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:41:17,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2022-11-23 14:41:17,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2022-11-23 14:41:17,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:17,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2022-11-23 14:41:17,231 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2022-11-23 14:41:17,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:41:17,231 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2022-11-23 14:41:17,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:17,232 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2022-11-23 14:41:17,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 14:41:17,232 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:17,233 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:17,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 14:41:17,233 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:17,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:17,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1788682382, now seen corresponding path program 1 times [2022-11-23 14:41:17,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:17,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033683226] [2022-11-23 14:41:17,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:17,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:17,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:17,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:17,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:17,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033683226] [2022-11-23 14:41:17,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033683226] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:41:17,461 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:41:17,461 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:41:17,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749190327] [2022-11-23 14:41:17,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:41:17,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:41:17,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:17,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:41:17,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:41:17,464 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:17,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:41:17,507 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2022-11-23 14:41:17,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:41:17,508 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-23 14:41:17,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:41:17,508 INFO L225 Difference]: With dead ends: 19 [2022-11-23 14:41:17,509 INFO L226 Difference]: Without dead ends: 15 [2022-11-23 14:41:17,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:41:17,511 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 1 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:41:17,511 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 11 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:41:17,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-23 14:41:17,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 12. [2022-11-23 14:41:17,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:17,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2022-11-23 14:41:17,515 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2022-11-23 14:41:17,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:41:17,516 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2022-11-23 14:41:17,516 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:17,516 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2022-11-23 14:41:17,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-23 14:41:17,517 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:17,517 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:17,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:41:17,517 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:17,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:17,518 INFO L85 PathProgramCache]: Analyzing trace with hash 981712553, now seen corresponding path program 1 times [2022-11-23 14:41:17,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:17,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065223514] [2022-11-23 14:41:17,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:17,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:17,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:17,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:17,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:17,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065223514] [2022-11-23 14:41:17,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065223514] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:41:17,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750436276] [2022-11-23 14:41:17,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:17,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:17,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:41:17,749 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:41:17,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:41:17,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:17,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 14:41:17,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:41:17,880 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:17,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:41:17,923 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:17,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [750436276] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:41:17,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2042030896] [2022-11-23 14:41:17,949 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:41:17,951 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:41:17,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:41:17,961 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:41:17,962 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:41:18,312 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:41:18,708 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '173#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (not (<= 100 |ULTIMATE.start_main_~j~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< |ULTIMATE.start_main_~i~0#1| 200) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:41:18,708 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:41:18,708 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:41:18,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-23 14:41:18,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600054164] [2022-11-23 14:41:18,709 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:41:18,709 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:41:18,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:18,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:41:18,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2022-11-23 14:41:18,711 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:18,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:41:18,860 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2022-11-23 14:41:18,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 14:41:18,861 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-23 14:41:18,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:41:18,862 INFO L225 Difference]: With dead ends: 42 [2022-11-23 14:41:18,862 INFO L226 Difference]: Without dead ends: 34 [2022-11-23 14:41:18,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:41:18,868 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 16 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:41:18,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 30 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:41:18,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-23 14:41:18,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2022-11-23 14:41:18,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:18,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2022-11-23 14:41:18,880 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 11 [2022-11-23 14:41:18,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:41:18,880 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2022-11-23 14:41:18,881 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:18,881 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2022-11-23 14:41:18,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 14:41:18,882 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:18,883 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:18,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:41:19,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:19,090 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:19,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:19,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1147123834, now seen corresponding path program 2 times [2022-11-23 14:41:19,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:19,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826210768] [2022-11-23 14:41:19,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:19,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:19,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:19,360 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:19,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:19,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826210768] [2022-11-23 14:41:19,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826210768] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:41:19,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391445187] [2022-11-23 14:41:19,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:41:19,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:19,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:41:19,363 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:41:19,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:41:19,428 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 14:41:19,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:41:19,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:41:19,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:41:19,490 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:19,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:41:19,586 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:19,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391445187] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:41:19,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [81151614] [2022-11-23 14:41:19,600 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:41:19,600 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:41:19,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:41:19,602 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:41:19,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:41:19,781 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:41:20,101 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '383#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (not (<= 100 |ULTIMATE.start_main_~j~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< |ULTIMATE.start_main_~i~0#1| 200) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:41:20,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:41:20,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:41:20,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2022-11-23 14:41:20,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778132565] [2022-11-23 14:41:20,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:41:20,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 14:41:20,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:20,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 14:41:20,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=337, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:41:20,104 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:20,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:41:20,309 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2022-11-23 14:41:20,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 14:41:20,310 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-23 14:41:20,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:41:20,312 INFO L225 Difference]: With dead ends: 86 [2022-11-23 14:41:20,312 INFO L226 Difference]: Without dead ends: 72 [2022-11-23 14:41:20,313 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=185, Invalid=571, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:41:20,314 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 66 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:41:20,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 38 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:41:20,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-23 14:41:20,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 45. [2022-11-23 14:41:20,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 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) [2022-11-23 14:41:20,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2022-11-23 14:41:20,323 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 17 [2022-11-23 14:41:20,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:41:20,323 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2022-11-23 14:41:20,323 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:20,324 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2022-11-23 14:41:20,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-23 14:41:20,325 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:20,325 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:20,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:41:20,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:20,531 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:20,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:20,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1590027812, now seen corresponding path program 3 times [2022-11-23 14:41:20,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:20,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745490527] [2022-11-23 14:41:20,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:20,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:20,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:20,874 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:20,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:20,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745490527] [2022-11-23 14:41:20,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745490527] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:41:20,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791319252] [2022-11-23 14:41:20,875 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:41:20,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:20,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:41:20,878 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:41:20,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:41:20,942 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:41:20,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:41:20,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-23 14:41:20,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:41:21,023 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:21,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:41:21,288 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:21,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791319252] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:41:21,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [333923474] [2022-11-23 14:41:21,291 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:41:21,291 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:41:21,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:41:21,292 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:41:21,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:41:21,410 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:41:21,746 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '773#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (not (<= 100 |ULTIMATE.start_main_~j~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< |ULTIMATE.start_main_~i~0#1| 200) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:41:21,746 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:41:21,746 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:41:21,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2022-11-23 14:41:21,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33750096] [2022-11-23 14:41:21,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:41:21,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-23 14:41:21,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:21,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-23 14:41:21,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=751, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 14:41:21,749 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:22,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:41:22,255 INFO L93 Difference]: Finished difference Result 206 states and 240 transitions. [2022-11-23 14:41:22,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 14:41:22,256 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-11-23 14:41:22,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:41:22,257 INFO L225 Difference]: With dead ends: 206 [2022-11-23 14:41:22,258 INFO L226 Difference]: Without dead ends: 180 [2022-11-23 14:41:22,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 501 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=563, Invalid=1507, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 14:41:22,259 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 234 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:41:22,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 55 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:41:22,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-11-23 14:41:22,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 87. [2022-11-23 14:41:22,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.1511627906976745) internal successors, (99), 86 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:22,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 99 transitions. [2022-11-23 14:41:22,272 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 99 transitions. Word has length 29 [2022-11-23 14:41:22,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:41:22,273 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 99 transitions. [2022-11-23 14:41:22,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:22,273 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 99 transitions. [2022-11-23 14:41:22,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-23 14:41:22,276 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:22,276 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:22,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:41:22,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:22,482 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:22,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:22,483 INFO L85 PathProgramCache]: Analyzing trace with hash 1362645920, now seen corresponding path program 4 times [2022-11-23 14:41:22,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:22,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980378872] [2022-11-23 14:41:22,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:22,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:22,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:23,185 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:23,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:23,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980378872] [2022-11-23 14:41:23,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980378872] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:41:23,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31112469] [2022-11-23 14:41:23,186 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:41:23,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:23,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:41:23,188 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:41:23,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:41:23,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:23,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-23 14:41:23,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:41:23,420 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:23,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:41:24,364 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:24,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31112469] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:41:24,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1066725885] [2022-11-23 14:41:24,366 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:41:24,366 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:41:24,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:41:24,366 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:41:24,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:41:24,492 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:41:24,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1571#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (not (<= 100 |ULTIMATE.start_main_~j~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< |ULTIMATE.start_main_~i~0#1| 200) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:41:24,852 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:41:24,852 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:41:24,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2022-11-23 14:41:24,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818485836] [2022-11-23 14:41:24,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:41:24,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-23 14:41:24,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:24,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-23 14:41:24,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1295, Invalid=2011, Unknown=0, NotChecked=0, Total=3306 [2022-11-23 14:41:24,856 INFO L87 Difference]: Start difference. First operand 87 states and 99 transitions. Second operand has 51 states, 51 states have (on average 2.196078431372549) internal successors, (112), 50 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:26,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:41:26,237 INFO L93 Difference]: Finished difference Result 554 states and 624 transitions. [2022-11-23 14:41:26,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-23 14:41:26,242 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.196078431372549) internal successors, (112), 50 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2022-11-23 14:41:26,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:41:26,253 INFO L225 Difference]: With dead ends: 554 [2022-11-23 14:41:26,254 INFO L226 Difference]: Without dead ends: 504 [2022-11-23 14:41:26,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1305 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1967, Invalid=4675, Unknown=0, NotChecked=0, Total=6642 [2022-11-23 14:41:26,259 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 871 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 409 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 871 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 409 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:41:26,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [871 Valid, 108 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [409 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:41:26,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2022-11-23 14:41:26,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 171. [2022-11-23 14:41:26,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.1470588235294117) internal successors, (195), 170 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:26,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 195 transitions. [2022-11-23 14:41:26,308 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 195 transitions. Word has length 53 [2022-11-23 14:41:26,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:41:26,309 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 195 transitions. [2022-11-23 14:41:26,309 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.196078431372549) internal successors, (112), 50 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:26,309 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 195 transitions. [2022-11-23 14:41:26,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-11-23 14:41:26,311 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:26,312 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:26,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:41:26,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 14:41:26,519 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:26,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:26,520 INFO L85 PathProgramCache]: Analyzing trace with hash 569942824, now seen corresponding path program 5 times [2022-11-23 14:41:26,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:26,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257077001] [2022-11-23 14:41:26,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:26,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:26,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:28,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:28,663 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:28,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257077001] [2022-11-23 14:41:28,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257077001] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:41:28,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646434702] [2022-11-23 14:41:28,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:41:28,664 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:28,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:41:28,666 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:41:28,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:41:28,845 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2022-11-23 14:41:28,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:41:28,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-23 14:41:28,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:41:29,064 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:29,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:41:32,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:32,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646434702] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:41:32,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [931779514] [2022-11-23 14:41:32,284 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:41:32,284 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:41:32,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:41:32,284 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:41:32,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:41:32,381 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:41:32,815 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3347#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (not (<= 100 |ULTIMATE.start_main_~j~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< |ULTIMATE.start_main_~i~0#1| 200) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:41:32,815 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:41:32,815 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:41:32,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2022-11-23 14:41:32,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050719085] [2022-11-23 14:41:32,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:41:32,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-11-23 14:41:32,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:32,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-11-23 14:41:32,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4871, Invalid=6259, Unknown=0, NotChecked=0, Total=11130 [2022-11-23 14:41:32,821 INFO L87 Difference]: Start difference. First operand 171 states and 195 transitions. Second operand has 99 states, 99 states have (on average 2.101010101010101) internal successors, (208), 98 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:37,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:41:37,472 INFO L93 Difference]: Finished difference Result 1682 states and 1824 transitions. [2022-11-23 14:41:37,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2022-11-23 14:41:37,473 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 2.101010101010101) internal successors, (208), 98 states have internal predecessors, (208), 0 states have call successors, (0), 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 101 [2022-11-23 14:41:37,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:41:37,481 INFO L225 Difference]: With dead ends: 1682 [2022-11-23 14:41:37,481 INFO L226 Difference]: Without dead ends: 1584 [2022-11-23 14:41:37,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3777 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=7367, Invalid=16195, Unknown=0, NotChecked=0, Total=23562 [2022-11-23 14:41:37,491 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 1084 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 508 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1084 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 508 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-23 14:41:37,491 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1084 Valid, 213 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [508 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-23 14:41:37,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1584 states. [2022-11-23 14:41:37,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1584 to 339. [2022-11-23 14:41:37,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 339 states, 338 states have (on average 1.1449704142011834) internal successors, (387), 338 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:37,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 387 transitions. [2022-11-23 14:41:37,551 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 387 transitions. Word has length 101 [2022-11-23 14:41:37,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:41:37,551 INFO L495 AbstractCegarLoop]: Abstraction has 339 states and 387 transitions. [2022-11-23 14:41:37,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 2.101010101010101) internal successors, (208), 98 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:41:37,552 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 387 transitions. [2022-11-23 14:41:37,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2022-11-23 14:41:37,557 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:37,557 INFO L195 NwaCegarLoop]: trace histogram [95, 94, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:37,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:41:37,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:37,763 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:37,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:37,763 INFO L85 PathProgramCache]: Analyzing trace with hash 1568191032, now seen corresponding path program 6 times [2022-11-23 14:41:37,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:37,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374417660] [2022-11-23 14:41:37,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:37,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:37,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:41:44,604 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:44,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:44,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374417660] [2022-11-23 14:41:44,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374417660] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:41:44,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467292075] [2022-11-23 14:41:44,605 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:41:44,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:44,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:41:44,606 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:41:44,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:41:44,802 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:41:44,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:41:44,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 792 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-23 14:41:44,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:41:45,241 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:45,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:41:56,380 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:41:56,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467292075] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:41:56,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [836312321] [2022-11-23 14:41:56,382 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:41:56,382 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:41:56,383 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:41:56,383 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:41:56,383 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:41:56,499 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:41:57,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7727#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (not (<= 100 |ULTIMATE.start_main_~j~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< |ULTIMATE.start_main_~i~0#1| 200) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:41:57,105 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:41:57,105 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:41:57,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 194 [2022-11-23 14:41:57,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533740317] [2022-11-23 14:41:57,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:41:57,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 195 states [2022-11-23 14:41:57,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:57,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 195 interpolants. [2022-11-23 14:41:57,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18935, Invalid=21667, Unknown=0, NotChecked=0, Total=40602 [2022-11-23 14:41:57,115 INFO L87 Difference]: Start difference. First operand 339 states and 387 transitions. Second operand has 195 states, 195 states have (on average 2.051282051282051) internal successors, (400), 194 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:42:27,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:42:27,415 INFO L93 Difference]: Finished difference Result 5666 states and 5952 transitions. [2022-11-23 14:42:27,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2022-11-23 14:42:27,422 INFO L78 Accepts]: Start accepts. Automaton has has 195 states, 195 states have (on average 2.051282051282051) internal successors, (400), 194 states have internal predecessors, (400), 0 states have call successors, (0), 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 197 [2022-11-23 14:42:27,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:42:27,438 INFO L225 Difference]: With dead ends: 5666 [2022-11-23 14:42:27,439 INFO L226 Difference]: Without dead ends: 5472 [2022-11-23 14:42:27,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 486 SyntacticMatches, 0 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12177 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=28535, Invalid=59971, Unknown=0, NotChecked=0, Total=88506 [2022-11-23 14:42:27,450 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 2818 mSDsluCounter, 408 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 1496 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2818 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 2388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1496 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-23 14:42:27,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2818 Valid, 412 Invalid, 2388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1496 Valid, 892 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-23 14:42:27,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5472 states. [2022-11-23 14:42:27,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5472 to 675. [2022-11-23 14:42:27,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 675 states, 674 states have (on average 1.1439169139465875) internal successors, (771), 674 states have internal predecessors, (771), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:42:27,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 675 states to 675 states and 771 transitions. [2022-11-23 14:42:27,674 INFO L78 Accepts]: Start accepts. Automaton has 675 states and 771 transitions. Word has length 197 [2022-11-23 14:42:27,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:42:27,674 INFO L495 AbstractCegarLoop]: Abstraction has 675 states and 771 transitions. [2022-11-23 14:42:27,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 195 states, 195 states have (on average 2.051282051282051) internal successors, (400), 194 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:42:27,675 INFO L276 IsEmpty]: Start isEmpty. Operand 675 states and 771 transitions. [2022-11-23 14:42:27,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2022-11-23 14:42:27,682 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:42:27,682 INFO L195 NwaCegarLoop]: trace histogram [191, 190, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:42:27,689 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-23 14:42:27,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:42:27,889 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:42:27,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:42:27,890 INFO L85 PathProgramCache]: Analyzing trace with hash -1812557736, now seen corresponding path program 7 times [2022-11-23 14:42:27,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:42:27,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540079858] [2022-11-23 14:42:27,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:42:27,891 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:42:28,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:42:51,618 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 0 proven. 36290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:42:51,618 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:42:51,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540079858] [2022-11-23 14:42:51,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [540079858] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:42:51,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749339186] [2022-11-23 14:42:51,619 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:42:51,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:42:51,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:42:51,620 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:42:51,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:42:51,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:42:51,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 1560 conjuncts, 192 conjunts are in the unsatisfiable core [2022-11-23 14:42:51,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:43:22,281 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 36290 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:43:22,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:43:22,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749339186] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:43:22,281 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:43:22,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [193] imperfect sequences [193] total 385 [2022-11-23 14:43:22,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497270971] [2022-11-23 14:43:22,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:43:22,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2022-11-23 14:43:22,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:43:22,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2022-11-23 14:43:22,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37057, Invalid=110783, Unknown=0, NotChecked=0, Total=147840 [2022-11-23 14:43:22,296 INFO L87 Difference]: Start difference. First operand 675 states and 771 transitions. Second operand has 193 states, 193 states have (on average 2.0155440414507773) internal successors, (389), 193 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:43:37,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:43:37,478 INFO L93 Difference]: Finished difference Result 27955 states and 28141 transitions. [2022-11-23 14:43:37,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2022-11-23 14:43:37,478 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 2.0155440414507773) internal successors, (389), 193 states have internal predecessors, (389), 0 states have call successors, (0), 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 389 [2022-11-23 14:43:37,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:43:37,482 INFO L225 Difference]: With dead ends: 27955 [2022-11-23 14:43:37,482 INFO L226 Difference]: Without dead ends: 1198 [2022-11-23 14:43:37,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 383 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36480 ImplicationChecksByTransitivity, 44.1s TimeCoverageRelationStatistics Valid=37057, Invalid=110783, Unknown=0, NotChecked=0, Total=147840 [2022-11-23 14:43:37,514 INFO L413 NwaCegarLoop]: 198 mSDtfsCounter, 851 mSDsluCounter, 931 mSDsCounter, 0 mSdLazyCounter, 1014 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 851 SdHoareTripleChecker+Valid, 1129 SdHoareTripleChecker+Invalid, 1105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 1014 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:43:37,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [851 Valid, 1129 Invalid, 1105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 1014 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:43:37,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1198 states. [2022-11-23 14:43:37,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1198 to 1182. [2022-11-23 14:43:37,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1182 states, 1181 states have (on average 1.0076206604572395) internal successors, (1190), 1181 states have internal predecessors, (1190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:43:37,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1182 states to 1182 states and 1190 transitions. [2022-11-23 14:43:37,713 INFO L78 Accepts]: Start accepts. Automaton has 1182 states and 1190 transitions. Word has length 389 [2022-11-23 14:43:37,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:43:37,713 INFO L495 AbstractCegarLoop]: Abstraction has 1182 states and 1190 transitions. [2022-11-23 14:43:37,713 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 2.0155440414507773) internal successors, (389), 193 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:43:37,713 INFO L276 IsEmpty]: Start isEmpty. Operand 1182 states and 1190 transitions. [2022-11-23 14:43:37,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2022-11-23 14:43:37,722 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:43:37,722 INFO L195 NwaCegarLoop]: trace histogram [100, 99, 92, 91, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:43:37,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:43:37,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:37,929 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:43:37,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:43:37,930 INFO L85 PathProgramCache]: Analyzing trace with hash 502894182, now seen corresponding path program 1 times [2022-11-23 14:43:37,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:43:37,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812711043] [2022-11-23 14:43:37,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:37,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:43:38,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:43:59,833 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:43:59,834 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:43:59,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812711043] [2022-11-23 14:43:59,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812711043] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:43:59,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179516356] [2022-11-23 14:43:59,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:59,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:59,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:43:59,838 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:43:59,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:44:00,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:44:00,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 1378 conjuncts, 197 conjunts are in the unsatisfiable core [2022-11-23 14:44:00,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:44:00,853 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:44:00,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:44:17,185 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:44:17,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179516356] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:44:17,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818810742] [2022-11-23 14:44:17,187 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:44:17,187 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:44:17,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:44:17,188 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:44:17,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:44:17,315 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:44:18,334 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64869#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (not (<= 100 |ULTIMATE.start_main_~j~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< |ULTIMATE.start_main_~i~0#1| 200) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:44:18,334 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:44:18,334 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:44:18,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 204 [2022-11-23 14:44:18,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175739164] [2022-11-23 14:44:18,335 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:44:18,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 205 states [2022-11-23 14:44:18,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:44:18,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2022-11-23 14:44:18,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20533, Invalid=24199, Unknown=0, NotChecked=0, Total=44732 [2022-11-23 14:44:18,344 INFO L87 Difference]: Start difference. First operand 1182 states and 1190 transitions. Second operand has 205 states, 205 states have (on average 2.1219512195121952) internal successors, (435), 204 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:44:31,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:44:31,856 INFO L93 Difference]: Finished difference Result 2333 states and 2468 transitions. [2022-11-23 14:44:31,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 211 states. [2022-11-23 14:44:31,856 INFO L78 Accepts]: Start accepts. Automaton has has 205 states, 205 states have (on average 2.1219512195121952) internal successors, (435), 204 states have internal predecessors, (435), 0 states have call successors, (0), 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 389 [2022-11-23 14:44:31,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:44:31,857 INFO L225 Difference]: With dead ends: 2333 [2022-11-23 14:44:31,857 INFO L226 Difference]: Without dead ends: 0 [2022-11-23 14:44:31,862 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1367 GetRequests, 966 SyntacticMatches, 182 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20845 ImplicationChecksByTransitivity, 31.9s TimeCoverageRelationStatistics Valid=20659, Invalid=27961, Unknown=0, NotChecked=0, Total=48620 [2022-11-23 14:44:31,862 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1322 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 1002 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1322 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 1483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1002 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-23 14:44:31,863 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1322 Valid, 317 Invalid, 1483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1002 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-23 14:44:31,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-11-23 14:44:31,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-11-23 14:44:31,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:44:31,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-11-23 14:44:31,864 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 389 [2022-11-23 14:44:31,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:44:31,864 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-11-23 14:44:31,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 205 states, 205 states have (on average 2.1219512195121952) internal successors, (435), 204 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:44:31,865 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-11-23 14:44:31,865 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-11-23 14:44:31,868 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-23 14:44:31,882 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 14:44:32,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0ec5e4a4-66ab-4d0d-ac08-29b6ef3ece28/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 14:44:32,077 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.