./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta --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 c802cbda9e8bed6a313e86b45d5d1f15426dd1417288149156d2bae000d97c78 --- 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-dbf71c6-m [2022-10-17 17:43:14,464 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:43:14,467 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:43:14,529 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:43:14,530 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:43:14,535 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:43:14,538 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:43:14,542 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:43:14,546 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:43:14,552 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:43:14,554 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:43:14,557 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:43:14,558 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:43:14,561 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:43:14,564 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:43:14,566 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:43:14,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:43:14,569 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:43:14,572 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:43:14,581 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:43:14,583 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:43:14,585 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:43:14,589 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:43:14,591 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:43:14,603 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:43:14,603 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:43:14,604 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:43:14,606 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:43:14,607 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:43:14,609 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:43:14,609 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:43:14,611 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:43:14,613 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:43:14,615 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:43:14,617 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:43:14,617 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:43:14,618 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:43:14,619 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:43:14,619 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:43:14,620 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:43:14,621 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:43:14,622 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-10-17 17:43:14,662 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:43:14,663 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:43:14,663 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:43:14,664 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:43:14,665 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:43:14,665 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:43:14,665 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:43:14,666 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:43:14,666 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:43:14,666 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:43:14,667 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:43:14,668 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:43:14,668 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:43:14,668 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:43:14,668 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:43:14,669 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:43:14,669 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:43:14,669 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:43:14,670 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:43:14,671 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:43:14,671 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:43:14,671 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:43:14,671 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:43:14,673 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:43:14,673 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:43:14,674 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:43:14,674 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:43:14,674 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:43:14,674 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:43:14,675 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:43:14,675 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:43:14,675 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:43:14,676 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:43:14,676 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:43:14,676 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:43:14,676 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:43:14,677 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:43:14,677 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:43:14,677 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:43:14,677 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:43:14,678 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:43:14,678 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_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c802cbda9e8bed6a313e86b45d5d1f15426dd1417288149156d2bae000d97c78 [2022-10-17 17:43:15,092 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:43:15,131 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:43:15,135 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:43:15,136 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:43:15,138 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:43:15,140 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i [2022-10-17 17:43:15,216 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/data/c0b7c588b/51035040e69f42ec99947dac10def7a6/FLAG44d7a3fee [2022-10-17 17:43:15,725 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:43:15,725 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/sv-benchmarks/c/array-examples/standard_strcmp_ground.i [2022-10-17 17:43:15,731 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/data/c0b7c588b/51035040e69f42ec99947dac10def7a6/FLAG44d7a3fee [2022-10-17 17:43:16,058 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/data/c0b7c588b/51035040e69f42ec99947dac10def7a6 [2022-10-17 17:43:16,063 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:43:16,067 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:43:16,073 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:43:16,074 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:43:16,078 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:43:16,079 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,081 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2cf3f103 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16, skipping insertion in model container [2022-10-17 17:43:16,082 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,090 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:43:16,110 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:43:16,377 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/sv-benchmarks/c/array-examples/standard_strcmp_ground.i[815,828] [2022-10-17 17:43:16,402 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:43:16,412 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:43:16,429 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/sv-benchmarks/c/array-examples/standard_strcmp_ground.i[815,828] [2022-10-17 17:43:16,439 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:43:16,456 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:43:16,457 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16 WrapperNode [2022-10-17 17:43:16,458 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:43:16,459 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:43:16,459 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:43:16,460 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:43:16,469 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,478 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,504 INFO L138 Inliner]: procedures = 17, calls = 20, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 78 [2022-10-17 17:43:16,505 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:43:16,506 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:43:16,506 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:43:16,506 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:43:16,518 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,519 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,522 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,529 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,534 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,536 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,537 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,540 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:43:16,541 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:43:16,542 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:43:16,542 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:43:16,543 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (1/1) ... [2022-10-17 17:43:16,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:43:16,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:16,606 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:43:16,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:43:16,658 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:43:16,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:43:16,659 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-10-17 17:43:16,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-10-17 17:43:16,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:43:16,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:43:16,660 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-10-17 17:43:16,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-10-17 17:43:16,778 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:43:16,780 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:43:17,075 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:43:17,116 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:43:17,116 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-10-17 17:43:17,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:43:17 BoogieIcfgContainer [2022-10-17 17:43:17,119 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:43:17,122 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:43:17,122 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:43:17,126 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:43:17,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:43:16" (1/3) ... [2022-10-17 17:43:17,127 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a00fe41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:43:17, skipping insertion in model container [2022-10-17 17:43:17,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:16" (2/3) ... [2022-10-17 17:43:17,128 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a00fe41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:43:17, skipping insertion in model container [2022-10-17 17:43:17,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:43:17" (3/3) ... [2022-10-17 17:43:17,130 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_strcmp_ground.i [2022-10-17 17:43:17,149 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:43:17,150 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-10-17 17:43:17,227 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:43:17,240 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;@1ce17d21, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:43:17,241 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-17 17:43:17,246 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:17,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-10-17 17:43:17,254 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:17,255 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:17,256 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:17,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:17,266 INFO L85 PathProgramCache]: Analyzing trace with hash -715237656, now seen corresponding path program 1 times [2022-10-17 17:43:17,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:17,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145631332] [2022-10-17 17:43:17,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:17,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:17,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:17,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:17,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:17,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145631332] [2022-10-17 17:43:17,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145631332] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:17,690 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:43:17,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:43:17,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665732047] [2022-10-17 17:43:17,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:17,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:43:17,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:17,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:43:17,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:43:17,735 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:17,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:17,798 INFO L93 Difference]: Finished difference Result 25 states and 35 transitions. [2022-10-17 17:43:17,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:43:17,800 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-10-17 17:43:17,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:17,807 INFO L225 Difference]: With dead ends: 25 [2022-10-17 17:43:17,807 INFO L226 Difference]: Without dead ends: 12 [2022-10-17 17:43:17,810 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:43:17,814 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:17,815 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:43:17,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-10-17 17:43:17,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-10-17 17:43:17,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:17,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2022-10-17 17:43:17,846 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2022-10-17 17:43:17,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:17,847 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2022-10-17 17:43:17,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:17,847 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2022-10-17 17:43:17,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-10-17 17:43:17,848 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:17,848 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:17,848 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:43:17,849 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:17,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:17,849 INFO L85 PathProgramCache]: Analyzing trace with hash 352703344, now seen corresponding path program 1 times [2022-10-17 17:43:17,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:17,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685083182] [2022-10-17 17:43:17,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:17,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:17,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:17,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:17,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:17,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685083182] [2022-10-17 17:43:17,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685083182] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:17,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674833912] [2022-10-17 17:43:17,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:17,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:17,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:17,962 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:17,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:43:18,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:18,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 2 conjunts are in the unsatisfiable core [2022-10-17 17:43:18,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:18,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:18,110 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:43:18,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674833912] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:18,110 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-10-17 17:43:18,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2022-10-17 17:43:18,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387690989] [2022-10-17 17:43:18,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:18,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:43:18,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:18,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:43:18,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:43:18,115 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 3 states, 3 states have (on average 3.0) 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) [2022-10-17 17:43:18,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:18,149 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2022-10-17 17:43:18,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:43:18,150 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) 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 [2022-10-17 17:43:18,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:18,152 INFO L225 Difference]: With dead ends: 28 [2022-10-17 17:43:18,152 INFO L226 Difference]: Without dead ends: 21 [2022-10-17 17:43:18,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:43:18,155 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:18,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 14 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:43:18,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-10-17 17:43:18,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 13. [2022-10-17 17:43:18,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:18,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-10-17 17:43:18,162 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 9 [2022-10-17 17:43:18,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:18,163 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-10-17 17:43:18,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) 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) [2022-10-17 17:43:18,163 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-10-17 17:43:18,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-10-17 17:43:18,164 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:18,165 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:18,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:18,383 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:18,384 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:18,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:18,385 INFO L85 PathProgramCache]: Analyzing trace with hash -201190691, now seen corresponding path program 1 times [2022-10-17 17:43:18,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:18,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754478208] [2022-10-17 17:43:18,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:18,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:18,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:18,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:18,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:18,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754478208] [2022-10-17 17:43:18,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754478208] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:18,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303697861] [2022-10-17 17:43:18,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:18,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:18,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:18,521 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:18,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:43:18,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:18,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2022-10-17 17:43:18,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:18,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:18,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:18,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:18,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1303697861] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:18,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [640444162] [2022-10-17 17:43:18,690 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-10-17 17:43:18,690 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:18,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:18,698 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:18,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:18,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:18,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:18,857 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:18,859 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:18,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:18,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:18,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-10-17 17:43:18,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:18,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:18,998 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-10-17 17:43:19,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:19,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:19,250 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:19,251 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:19,252 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:19,344 INFO L356 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-10-17 17:43:19,346 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-10-17 17:43:19,834 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:19,852 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:19,852 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:19,913 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:20,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [640444162] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:20,252 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:20,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2022-10-17 17:43:20,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432861353] [2022-10-17 17:43:20,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:20,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 17:43:20,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:20,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 17:43:20,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-10-17 17:43:20,259 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:20,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:20,360 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2022-10-17 17:43:20,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 17:43:20,361 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-10-17 17:43:20,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:20,363 INFO L225 Difference]: With dead ends: 21 [2022-10-17 17:43:20,364 INFO L226 Difference]: Without dead ends: 14 [2022-10-17 17:43:20,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-10-17 17:43:20,375 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 15 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:20,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 18 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:43:20,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-10-17 17:43:20,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-10-17 17:43:20,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:20,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-10-17 17:43:20,390 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 10 [2022-10-17 17:43:20,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:20,390 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-10-17 17:43:20,391 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:20,391 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-10-17 17:43:20,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-10-17 17:43:20,393 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:20,394 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:20,444 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:20,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:20,608 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:20,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:20,609 INFO L85 PathProgramCache]: Analyzing trace with hash 975217493, now seen corresponding path program 1 times [2022-10-17 17:43:20,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:20,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925585210] [2022-10-17 17:43:20,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:20,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:20,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:20,678 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:20,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:20,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925585210] [2022-10-17 17:43:20,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925585210] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:20,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146748579] [2022-10-17 17:43:20,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:20,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:20,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:20,696 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:20,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:43:20,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:20,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2022-10-17 17:43:20,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:20,774 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:20,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:20,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:43:20,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146748579] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:20,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [918415216] [2022-10-17 17:43:20,802 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-10-17 17:43:20,803 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:20,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:20,804 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:20,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:20,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:20,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:20,865 INFO L356 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-10-17 17:43:20,866 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-10-17 17:43:20,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:20,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:20,926 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:20,927 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:20,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:20,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:20,975 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-10-17 17:43:21,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:21,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:21,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:21,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:21,088 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:21,093 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:21,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:21,156 INFO L356 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-10-17 17:43:21,156 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-10-17 17:43:21,241 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:21,254 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:21,257 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:21,466 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:22,244 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:22,244 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:22,245 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:22,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-10-17 17:43:22,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028193904] [2022-10-17 17:43:22,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:22,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 17:43:22,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:22,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 17:43:22,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:43:22,247 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:22,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:22,275 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2022-10-17 17:43:22,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:43:22,275 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-10-17 17:43:22,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:22,276 INFO L225 Difference]: With dead ends: 28 [2022-10-17 17:43:22,276 INFO L226 Difference]: Without dead ends: 17 [2022-10-17 17:43:22,276 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:43:22,277 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:22,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:43:22,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-10-17 17:43:22,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-10-17 17:43:22,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:22,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-10-17 17:43:22,282 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 11 [2022-10-17 17:43:22,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:22,283 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-10-17 17:43:22,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:22,283 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-10-17 17:43:22,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-10-17 17:43:22,283 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:22,284 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:22,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:22,503 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:22,504 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:22,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:22,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1636529459, now seen corresponding path program 2 times [2022-10-17 17:43:22,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:22,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250658014] [2022-10-17 17:43:22,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:22,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:22,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:22,642 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:43:22,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:22,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250658014] [2022-10-17 17:43:22,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250658014] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:22,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874322343] [2022-10-17 17:43:22,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:43:22,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:22,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:22,644 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:22,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-10-17 17:43:22,709 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-10-17 17:43:22,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:43:22,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 3 conjunts are in the unsatisfiable core [2022-10-17 17:43:22,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:22,721 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:43:22,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:22,736 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:43:22,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874322343] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:22,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1197852596] [2022-10-17 17:43:22,739 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-10-17 17:43:22,739 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:22,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:22,740 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:22,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:22,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,789 INFO L356 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-10-17 17:43:22,790 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-10-17 17:43:22,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,848 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:22,848 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:22,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-10-17 17:43:22,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:22,999 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:23,003 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:23,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:23,049 INFO L356 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-10-17 17:43:23,050 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-10-17 17:43:23,128 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:23,144 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:23,145 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:23,342 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:24,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '498#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:24,080 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:24,081 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:24,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-10-17 17:43:24,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546952115] [2022-10-17 17:43:24,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:24,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 17:43:24,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:24,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 17:43:24,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:43:24,083 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:24,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:24,154 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2022-10-17 17:43:24,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:43:24,155 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-10-17 17:43:24,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:24,156 INFO L225 Difference]: With dead ends: 50 [2022-10-17 17:43:24,156 INFO L226 Difference]: Without dead ends: 43 [2022-10-17 17:43:24,158 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:43:24,159 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 54 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:24,159 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 34 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:43:24,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-10-17 17:43:24,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 22. [2022-10-17 17:43:24,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 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) [2022-10-17 17:43:24,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-10-17 17:43:24,174 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 14 [2022-10-17 17:43:24,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:24,174 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-10-17 17:43:24,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:24,175 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-10-17 17:43:24,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-10-17 17:43:24,176 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:24,176 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:24,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:24,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:24,392 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:24,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:24,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1737865440, now seen corresponding path program 1 times [2022-10-17 17:43:24,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:24,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500504574] [2022-10-17 17:43:24,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:24,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:24,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:24,517 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-10-17 17:43:24,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:24,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500504574] [2022-10-17 17:43:24,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500504574] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:24,518 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:43:24,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:43:24,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913761235] [2022-10-17 17:43:24,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:24,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-10-17 17:43:24,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:24,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-10-17 17:43:24,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:43:24,520 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 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) [2022-10-17 17:43:24,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:24,545 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2022-10-17 17:43:24,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-10-17 17:43:24,546 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-10-17 17:43:24,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:24,548 INFO L225 Difference]: With dead ends: 29 [2022-10-17 17:43:24,550 INFO L226 Difference]: Without dead ends: 22 [2022-10-17 17:43:24,550 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:43:24,552 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:24,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 22 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:43:24,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-10-17 17:43:24,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-10-17 17:43:24,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:24,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-10-17 17:43:24,559 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2022-10-17 17:43:24,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:24,559 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-10-17 17:43:24,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 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) [2022-10-17 17:43:24,560 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-10-17 17:43:24,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-10-17 17:43:24,560 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:24,561 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:24,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-10-17 17:43:24,561 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:24,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:24,562 INFO L85 PathProgramCache]: Analyzing trace with hash 141189372, now seen corresponding path program 3 times [2022-10-17 17:43:24,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:24,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29964539] [2022-10-17 17:43:24,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:24,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:24,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:24,691 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-10-17 17:43:24,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:24,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29964539] [2022-10-17 17:43:24,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29964539] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:24,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117959491] [2022-10-17 17:43:24,692 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:43:24,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:24,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:24,694 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:24,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-10-17 17:43:24,774 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:43:24,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:43:24,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 6 conjunts are in the unsatisfiable core [2022-10-17 17:43:24,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:24,834 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:43:24,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:24,915 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:43:24,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117959491] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:24,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [534320669] [2022-10-17 17:43:24,920 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-10-17 17:43:24,920 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:24,920 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:24,921 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:24,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:24,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:24,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:24,987 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:24,987 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:25,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,006 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-10-17 17:43:25,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,041 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-10-17 17:43:25,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,131 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:25,137 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:25,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:25,179 INFO L356 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-10-17 17:43:25,180 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-10-17 17:43:25,263 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:25,276 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:25,276 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:25,449 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:26,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '823#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:26,319 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:26,320 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:26,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 17 [2022-10-17 17:43:26,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585013556] [2022-10-17 17:43:26,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:26,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-10-17 17:43:26,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:26,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-10-17 17:43:26,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2022-10-17 17:43:26,322 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:26,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:26,400 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2022-10-17 17:43:26,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-10-17 17:43:26,401 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-10-17 17:43:26,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:26,401 INFO L225 Difference]: With dead ends: 51 [2022-10-17 17:43:26,401 INFO L226 Difference]: Without dead ends: 35 [2022-10-17 17:43:26,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2022-10-17 17:43:26,402 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 15 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:26,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 36 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:43:26,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-10-17 17:43:26,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-10-17 17:43:26,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:26,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-10-17 17:43:26,408 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2022-10-17 17:43:26,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:26,409 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-10-17 17:43:26,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:26,409 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-10-17 17:43:26,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-10-17 17:43:26,410 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:26,410 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:26,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:26,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-10-17 17:43:26,613 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:26,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:26,613 INFO L85 PathProgramCache]: Analyzing trace with hash 536609826, now seen corresponding path program 4 times [2022-10-17 17:43:26,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:26,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059717436] [2022-10-17 17:43:26,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:26,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:26,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:26,773 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-10-17 17:43:26,773 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:26,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059717436] [2022-10-17 17:43:26,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059717436] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:26,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353572119] [2022-10-17 17:43:26,774 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-10-17 17:43:26,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:26,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:26,779 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:26,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-10-17 17:43:26,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:26,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 7 conjunts are in the unsatisfiable core [2022-10-17 17:43:26,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:26,912 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-10-17 17:43:26,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:26,988 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-10-17 17:43:26,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353572119] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:26,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1037021261] [2022-10-17 17:43:26,992 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-10-17 17:43:26,992 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:26,992 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:26,993 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:26,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:27,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:27,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:27,050 INFO L356 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-10-17 17:43:27,051 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-10-17 17:43:27,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:27,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:27,102 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:27,102 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:27,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:27,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:27,147 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-10-17 17:43:27,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:27,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:27,228 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:27,229 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:27,230 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:27,302 INFO L356 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-10-17 17:43:27,303 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-10-17 17:43:27,577 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:27,588 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:27,588 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:27,752 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:28,523 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1168#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:28,523 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:28,523 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:28,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2022-10-17 17:43:28,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668626212] [2022-10-17 17:43:28,524 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:28,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-10-17 17:43:28,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:28,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-10-17 17:43:28,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2022-10-17 17:43:28,526 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:28,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:28,589 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2022-10-17 17:43:28,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-10-17 17:43:28,590 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-10-17 17:43:28,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:28,595 INFO L225 Difference]: With dead ends: 70 [2022-10-17 17:43:28,595 INFO L226 Difference]: Without dead ends: 42 [2022-10-17 17:43:28,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2022-10-17 17:43:28,598 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:28,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:43:28,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-10-17 17:43:28,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-10-17 17:43:28,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:28,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-10-17 17:43:28,616 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 33 [2022-10-17 17:43:28,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:28,617 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-10-17 17:43:28,617 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:28,617 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-10-17 17:43:28,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-10-17 17:43:28,619 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:28,619 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:28,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:28,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:28,837 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:28,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:28,838 INFO L85 PathProgramCache]: Analyzing trace with hash 126903194, now seen corresponding path program 5 times [2022-10-17 17:43:28,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:28,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218796535] [2022-10-17 17:43:28,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:28,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:28,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:29,254 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-10-17 17:43:29,255 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:29,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218796535] [2022-10-17 17:43:29,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218796535] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:29,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526362667] [2022-10-17 17:43:29,255 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:43:29,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:29,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:29,257 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:29,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-10-17 17:43:29,364 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-10-17 17:43:29,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:43:29,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 37 conjunts are in the unsatisfiable core [2022-10-17 17:43:29,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:29,733 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2022-10-17 17:43:29,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:29,922 INFO L356 Elim1Store]: treesize reduction 15, result has 81.9 percent of original size [2022-10-17 17:43:29,923 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 75 [2022-10-17 17:43:30,198 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2022-10-17 17:43:30,198 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526362667] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:30,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [182416369] [2022-10-17 17:43:30,201 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-10-17 17:43:30,201 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:30,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:30,202 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:30,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:30,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:30,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:30,248 INFO L356 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-10-17 17:43:30,249 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-10-17 17:43:30,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:30,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:30,302 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:30,303 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:30,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:30,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:30,334 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-10-17 17:43:30,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:30,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:30,417 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:30,418 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:30,419 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:30,497 INFO L356 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-10-17 17:43:30,497 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-10-17 17:43:30,729 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:30,739 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:30,739 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:30,994 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:32,234 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1612#(and (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start__strcmp_#res#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:32,234 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:32,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:32,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7, 7] total 25 [2022-10-17 17:43:32,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398931982] [2022-10-17 17:43:32,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:32,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-10-17 17:43:32,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:32,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-10-17 17:43:32,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=812, Unknown=0, NotChecked=0, Total=992 [2022-10-17 17:43:32,243 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 25 states, 25 states have (on average 1.8) internal successors, (45), 25 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:32,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:32,711 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2022-10-17 17:43:32,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-10-17 17:43:32,712 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.8) internal successors, (45), 25 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-10-17 17:43:32,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:32,712 INFO L225 Difference]: With dead ends: 75 [2022-10-17 17:43:32,713 INFO L226 Difference]: Without dead ends: 47 [2022-10-17 17:43:32,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 91 SyntacticMatches, 11 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=412, Invalid=1844, Unknown=0, NotChecked=0, Total=2256 [2022-10-17 17:43:32,715 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 21 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:32,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 56 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:43:32,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-10-17 17:43:32,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2022-10-17 17:43:32,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:32,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-10-17 17:43:32,725 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 40 [2022-10-17 17:43:32,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:32,725 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-10-17 17:43:32,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.8) internal successors, (45), 25 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:32,726 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-10-17 17:43:32,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-10-17 17:43:32,727 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:32,727 INFO L195 NwaCegarLoop]: trace histogram [13, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:32,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:32,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:32,941 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:32,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:32,941 INFO L85 PathProgramCache]: Analyzing trace with hash -1008499743, now seen corresponding path program 1 times [2022-10-17 17:43:32,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:32,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643330132] [2022-10-17 17:43:32,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:32,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:32,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:33,474 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-10-17 17:43:33,475 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:33,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643330132] [2022-10-17 17:43:33,475 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643330132] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:33,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684161864] [2022-10-17 17:43:33,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:33,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:33,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:33,477 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:33,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-10-17 17:43:33,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:33,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 15 conjunts are in the unsatisfiable core [2022-10-17 17:43:33,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:33,689 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-10-17 17:43:33,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:33,990 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-10-17 17:43:33,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684161864] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:33,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1659181694] [2022-10-17 17:43:33,995 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-10-17 17:43:33,995 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:33,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:33,996 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:33,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:34,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:34,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:34,055 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:34,055 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:34,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:34,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:34,068 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-10-17 17:43:34,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:34,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:34,095 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-10-17 17:43:34,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:34,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:34,167 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:34,168 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:34,169 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:34,249 INFO L356 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-10-17 17:43:34,250 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-10-17 17:43:34,516 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:34,526 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:34,530 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:34,821 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:35,544 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2130#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:35,545 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:35,545 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:35,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2022-10-17 17:43:35,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880250877] [2022-10-17 17:43:35,546 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:35,546 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-10-17 17:43:35,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:35,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-10-17 17:43:35,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=1042, Unknown=0, NotChecked=0, Total=1560 [2022-10-17 17:43:35,548 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:35,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:35,642 INFO L93 Difference]: Finished difference Result 90 states and 108 transitions. [2022-10-17 17:43:35,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-10-17 17:43:35,643 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-10-17 17:43:35,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:35,644 INFO L225 Difference]: With dead ends: 90 [2022-10-17 17:43:35,644 INFO L226 Difference]: Without dead ends: 60 [2022-10-17 17:43:35,645 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=518, Invalid=1042, Unknown=0, NotChecked=0, Total=1560 [2022-10-17 17:43:35,646 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:35,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 72 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:43:35,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-10-17 17:43:35,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-10-17 17:43:35,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:35,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2022-10-17 17:43:35,662 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 44 [2022-10-17 17:43:35,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:35,662 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2022-10-17 17:43:35,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:35,663 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2022-10-17 17:43:35,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-10-17 17:43:35,665 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:35,665 INFO L195 NwaCegarLoop]: trace histogram [28, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:35,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:35,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:35,888 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:35,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:35,888 INFO L85 PathProgramCache]: Analyzing trace with hash 409208169, now seen corresponding path program 2 times [2022-10-17 17:43:35,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:35,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885238706] [2022-10-17 17:43:35,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:35,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:35,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:37,247 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-10-17 17:43:37,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:37,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885238706] [2022-10-17 17:43:37,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885238706] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:37,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837992093] [2022-10-17 17:43:37,248 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:43:37,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:37,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:37,251 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:37,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-10-17 17:43:37,534 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-10-17 17:43:37,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:43:37,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 45 conjunts are in the unsatisfiable core [2022-10-17 17:43:37,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:38,117 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2022-10-17 17:43:38,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:38,359 INFO L356 Elim1Store]: treesize reduction 15, result has 83.5 percent of original size [2022-10-17 17:43:38,360 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 83 [2022-10-17 17:43:38,776 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2022-10-17 17:43:38,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837992093] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:38,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [753325244] [2022-10-17 17:43:38,779 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-10-17 17:43:38,779 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:38,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:38,779 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:38,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:38,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:38,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:38,827 INFO L356 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-10-17 17:43:38,827 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2022-10-17 17:43:38,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:38,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:38,879 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:38,879 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:38,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:38,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:38,900 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2022-10-17 17:43:38,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:38,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:38,990 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:38,991 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:38,991 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:39,056 INFO L356 Elim1Store]: treesize reduction 235, result has 16.4 percent of original size [2022-10-17 17:43:39,057 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 284 treesize of output 274 [2022-10-17 17:43:39,290 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:39,300 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:39,301 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:39,509 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:40,563 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2783#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:40,563 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:40,563 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:40,563 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 10, 9] total 46 [2022-10-17 17:43:40,563 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000362787] [2022-10-17 17:43:40,563 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:40,564 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-10-17 17:43:40,564 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:40,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-10-17 17:43:40,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=2361, Unknown=0, NotChecked=0, Total=2970 [2022-10-17 17:43:40,566 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 46 states, 46 states have (on average 1.608695652173913) internal successors, (74), 46 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:41,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:41,623 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2022-10-17 17:43:41,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-10-17 17:43:41,624 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.608695652173913) internal successors, (74), 46 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-10-17 17:43:41,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:41,625 INFO L225 Difference]: With dead ends: 96 [2022-10-17 17:43:41,625 INFO L226 Difference]: Without dead ends: 66 [2022-10-17 17:43:41,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1529, Invalid=5781, Unknown=0, NotChecked=0, Total=7310 [2022-10-17 17:43:41,629 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 37 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:41,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 74 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:43:41,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-10-17 17:43:41,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-10-17 17:43:41,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 63 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:41,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2022-10-17 17:43:41,652 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2022-10-17 17:43:41,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:41,652 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2022-10-17 17:43:41,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.608695652173913) internal successors, (74), 46 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:41,653 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2022-10-17 17:43:41,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-10-17 17:43:41,654 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:41,654 INFO L195 NwaCegarLoop]: trace histogram [29, 10, 10, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:41,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-10-17 17:43:41,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-10-17 17:43:41,868 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:41,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:41,868 INFO L85 PathProgramCache]: Analyzing trace with hash -899601470, now seen corresponding path program 3 times [2022-10-17 17:43:41,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:41,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783341023] [2022-10-17 17:43:41,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:41,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:41,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:43,368 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2022-10-17 17:43:43,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:43,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783341023] [2022-10-17 17:43:43,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783341023] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:43,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151032369] [2022-10-17 17:43:43,369 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:43:43,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:43,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:43,369 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:43,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-10-17 17:43:43,578 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:43:43,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:43:43,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 12 conjunts are in the unsatisfiable core [2022-10-17 17:43:43,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:43,805 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2022-10-17 17:43:43,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:43:44,110 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2022-10-17 17:43:44,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151032369] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:43:44,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [998323074] [2022-10-17 17:43:44,115 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-10-17 17:43:44,117 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:43:44,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:43:44,118 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:43:44,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:43:44,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,171 INFO L356 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2022-10-17 17:43:44,171 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2022-10-17 17:43:44,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,184 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2022-10-17 17:43:44,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,209 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2022-10-17 17:43:44,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,273 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:44,276 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:44,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:43:44,307 INFO L356 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2022-10-17 17:43:44,307 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 304 treesize of output 272 [2022-10-17 17:43:44,358 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:43:44,371 INFO L356 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2022-10-17 17:43:44,371 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2022-10-17 17:43:44,660 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:43:45,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3545#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.base|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_~src#1.base|) (<= |ULTIMATE.start__strcmp_~src#1.offset| 0) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.offset|) (<= 0 |ULTIMATE.start__strcmp_~dst#1.offset|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (<= 0 |ULTIMATE.start__strcmp_#in~src#1.base|) (<= 0 |ULTIMATE.start__strcmp_~src#1.offset|) (<= |ULTIMATE.start__strcmp_#in~dst#1.offset| 0) (<= |ULTIMATE.start__strcmp_#in~src#1.offset| 0) (< |ULTIMATE.start_main_~x~0#1| 100000) (<= |ULTIMATE.start__strcmp_~dst#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4)))) (<= 0 |ULTIMATE.start__strcmp_#in~dst#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 100000 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= (ite (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 100000 |ULTIMATE.start__strcmp_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-10-17 17:43:45,949 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:43:45,949 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:43:45,950 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 13, 13] total 54 [2022-10-17 17:43:45,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377560811] [2022-10-17 17:43:45,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:43:45,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-10-17 17:43:45,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:45,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-10-17 17:43:45,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=814, Invalid=2968, Unknown=0, NotChecked=0, Total=3782 [2022-10-17 17:43:45,952 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 54 states, 54 states have (on average 1.6111111111111112) internal successors, (87), 54 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:46,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:46,127 INFO L93 Difference]: Finished difference Result 122 states and 138 transitions. [2022-10-17 17:43:46,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-10-17 17:43:46,128 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.6111111111111112) internal successors, (87), 54 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2022-10-17 17:43:46,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:46,129 INFO L225 Difference]: With dead ends: 122 [2022-10-17 17:43:46,130 INFO L226 Difference]: Without dead ends: 89 [2022-10-17 17:43:46,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 148 SyntacticMatches, 10 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1724 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=814, Invalid=2968, Unknown=0, NotChecked=0, Total=3782 [2022-10-17 17:43:46,132 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 33 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:46,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 66 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:43:46,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-10-17 17:43:46,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-10-17 17:43:46,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:46,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-10-17 17:43:46,151 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 63 [2022-10-17 17:43:46,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:46,151 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-10-17 17:43:46,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.6111111111111112) internal successors, (87), 54 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:43:46,152 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-10-17 17:43:46,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-10-17 17:43:46,154 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:46,154 INFO L195 NwaCegarLoop]: trace histogram [30, 22, 22, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:46,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6011faf-abf6-49a6-8183-7a792fbe6754/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0