./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_copy6_ground-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_copy6_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --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 f9e86f2555d2c0682f4edf4cb7d0ea92e4bc79b6db041eb754ceacfe5541e219 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:35:31,762 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:35:31,832 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:35:31,838 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:35:31,839 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:35:31,868 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:35:31,869 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:35:31,869 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:35:31,870 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:35:31,871 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:35:31,871 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:35:31,872 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:35:31,873 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:35:31,873 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:35:31,874 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:35:31,874 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:35:31,875 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:35:31,883 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:35:31,884 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:35:31,884 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:35:31,885 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:35:31,886 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:35:31,887 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:35:31,887 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:35:31,888 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:35:31,888 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:35:31,889 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:35:31,889 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:35:31,890 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:35:31,890 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:35:31,891 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:35:31,891 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:35:31,892 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:35:31,892 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:35:31,893 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:35:31,893 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:35:31,893 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:35:31,894 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:35:31,894 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:35:31,895 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:35:31,895 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:35:31,898 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:35:31,899 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:35:31,899 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:35:31,899 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:35:31,900 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:35:31,900 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:35:31,900 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f9e86f2555d2c0682f4edf4cb7d0ea92e4bc79b6db041eb754ceacfe5541e219 [2023-11-23 20:35:32,198 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:35:32,228 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:35:32,231 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:35:32,233 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:35:32,234 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:35:32,235 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/array-examples/standard_copy6_ground-2.i [2023-11-23 20:35:35,426 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:35:35,625 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:35:35,625 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/sv-benchmarks/c/array-examples/standard_copy6_ground-2.i [2023-11-23 20:35:35,636 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/data/33d430dc0/bd563edc25334cbbbc5f9adff4fa17cf/FLAG5e158f8c3 [2023-11-23 20:35:35,653 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/data/33d430dc0/bd563edc25334cbbbc5f9adff4fa17cf [2023-11-23 20:35:35,655 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:35:35,658 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:35:35,660 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:35:35,660 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:35:35,666 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:35:35,667 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:35:35" (1/1) ... [2023-11-23 20:35:35,668 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28dcd1bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:35, skipping insertion in model container [2023-11-23 20:35:35,669 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:35:35" (1/1) ... [2023-11-23 20:35:35,694 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:35:35,889 WARN L240 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_4edf634a-b7d5-41bd-aee4-6f1411232e43/sv-benchmarks/c/array-examples/standard_copy6_ground-2.i[816,829] [2023-11-23 20:35:35,928 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:35:35,945 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:35:35,963 WARN L240 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_4edf634a-b7d5-41bd-aee4-6f1411232e43/sv-benchmarks/c/array-examples/standard_copy6_ground-2.i[816,829] [2023-11-23 20:35:36,005 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:35:36,030 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:35:36,031 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36 WrapperNode [2023-11-23 20:35:36,031 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:35:36,033 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:35:36,033 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:35:36,034 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:35:36,044 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,064 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,092 INFO L138 Inliner]: procedures = 16, calls = 43, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 144 [2023-11-23 20:35:36,093 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:35:36,094 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:35:36,094 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:35:36,094 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:35:36,105 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,105 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,109 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,109 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,118 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,123 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,125 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,126 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,129 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:35:36,131 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:35:36,131 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:35:36,131 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:35:36,132 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (1/1) ... [2023-11-23 20:35:36,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:35:36,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:36,196 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:35:36,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:35:36,232 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:35:36,233 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:35:36,233 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 20:35:36,233 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 20:35:36,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:35:36,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:35:36,234 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 20:35:36,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 20:35:36,323 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:35:36,326 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:35:36,653 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:35:36,757 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:35:36,757 INFO L309 CfgBuilder]: Removed 8 assume(true) statements. [2023-11-23 20:35:36,759 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:35:36 BoogieIcfgContainer [2023-11-23 20:35:36,760 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:35:36,763 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:35:36,763 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:35:36,767 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:35:36,768 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:35:35" (1/3) ... [2023-11-23 20:35:36,769 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@722d885b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:35:36, skipping insertion in model container [2023-11-23 20:35:36,769 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:35:36" (2/3) ... [2023-11-23 20:35:36,769 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@722d885b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:35:36, skipping insertion in model container [2023-11-23 20:35:36,770 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:35:36" (3/3) ... [2023-11-23 20:35:36,771 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_copy6_ground-2.i [2023-11-23 20:35:36,790 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:35:36,790 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 20:35:36,844 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:35:36,852 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=LoopHeads, 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;@53c29990, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:35:36,853 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 20:35:36,859 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 13 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:36,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 20:35:36,869 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:36,870 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:36,871 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:36,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:36,883 INFO L85 PathProgramCache]: Analyzing trace with hash -1366277802, now seen corresponding path program 1 times [2023-11-23 20:35:36,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:36,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625159883] [2023-11-23 20:35:36,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:36,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:37,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:37,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:37,460 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:37,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625159883] [2023-11-23 20:35:37,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625159883] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:37,463 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:35:37,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 20:35:37,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049468113] [2023-11-23 20:35:37,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:37,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:35:37,474 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:37,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:35:37,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:35:37,537 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 13 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 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) [2023-11-23 20:35:37,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:37,659 INFO L93 Difference]: Finished difference Result 27 states and 43 transitions. [2023-11-23 20:35:37,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:35:37,663 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 20:35:37,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:37,673 INFO L225 Difference]: With dead ends: 27 [2023-11-23 20:35:37,674 INFO L226 Difference]: Without dead ends: 14 [2023-11-23 20:35:37,678 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 [2023-11-23 20:35:37,684 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:37,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:37,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-23 20:35:37,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-23 20:35:37,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:37,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 21 transitions. [2023-11-23 20:35:37,729 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 21 transitions. Word has length 11 [2023-11-23 20:35:37,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:37,730 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 21 transitions. [2023-11-23 20:35:37,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 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) [2023-11-23 20:35:37,731 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 21 transitions. [2023-11-23 20:35:37,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 20:35:37,732 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:37,733 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:37,733 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:35:37,734 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:37,734 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:37,735 INFO L85 PathProgramCache]: Analyzing trace with hash 955550290, now seen corresponding path program 1 times [2023-11-23 20:35:37,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:37,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545068426] [2023-11-23 20:35:37,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:37,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:37,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:37,980 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:35:37,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:37,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545068426] [2023-11-23 20:35:37,983 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545068426] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:37,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312783230] [2023-11-23 20:35:37,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:37,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:37,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:37,987 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:38,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:35:38,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:38,139 INFO L262 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:35:38,145 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:38,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:35:38,174 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:35:38,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312783230] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:38,181 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:35:38,181 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2023-11-23 20:35:38,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111393911] [2023-11-23 20:35:38,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:38,186 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:35:38,186 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:38,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:35:38,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:35:38,189 INFO L87 Difference]: Start difference. First operand 14 states and 21 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:38,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:38,273 INFO L93 Difference]: Finished difference Result 30 states and 48 transitions. [2023-11-23 20:35:38,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:35:38,274 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-23 20:35:38,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:38,276 INFO L225 Difference]: With dead ends: 30 [2023-11-23 20:35:38,277 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 20:35:38,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:35:38,279 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:38,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:38,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 20:35:38,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 20:35:38,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 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) [2023-11-23 20:35:38,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2023-11-23 20:35:38,301 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 12 [2023-11-23 20:35:38,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:38,302 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2023-11-23 20:35:38,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:38,303 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2023-11-23 20:35:38,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 20:35:38,304 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:38,305 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:38,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:38,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:38,520 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:38,521 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:38,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1244584329, now seen corresponding path program 1 times [2023-11-23 20:35:38,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:38,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787293989] [2023-11-23 20:35:38,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:38,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:38,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:38,670 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:35:38,670 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:38,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787293989] [2023-11-23 20:35:38,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787293989] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:38,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198488750] [2023-11-23 20:35:38,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:38,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:38,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:38,685 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:38,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:35:38,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:38,811 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:35:38,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:38,855 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:35:38,855 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:38,881 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:35:38,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198488750] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:38,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183776016] [2023-11-23 20:35:38,905 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:35:38,906 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:38,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:35:38,917 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:35:38,917 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:35:40,918 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:35:41,565 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '319#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem17#1| |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_#t~mem17#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a7~0#1.base|) 0)) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem16#1|))' at error location [2023-11-23 20:35:41,566 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:35:41,566 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:41,566 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-23 20:35:41,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515130098] [2023-11-23 20:35:41,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:41,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 20:35:41,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:41,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 20:35:41,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:35:41,570 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:41,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:41,626 INFO L93 Difference]: Finished difference Result 40 states and 56 transitions. [2023-11-23 20:35:41,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:35:41,627 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-23 20:35:41,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:41,628 INFO L225 Difference]: With dead ends: 40 [2023-11-23 20:35:41,628 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 20:35:41,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:35:41,630 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:41,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:35:41,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 20:35:41,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 20:35:41,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:41,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2023-11-23 20:35:41,637 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 18 [2023-11-23 20:35:41,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:41,637 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2023-11-23 20:35:41,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:41,638 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2023-11-23 20:35:41,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-23 20:35:41,639 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:41,639 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:41,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:41,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:41,852 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:41,852 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:41,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1128047475, now seen corresponding path program 2 times [2023-11-23 20:35:41,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:41,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547883621] [2023-11-23 20:35:41,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:41,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:41,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:41,957 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:35:41,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:41,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547883621] [2023-11-23 20:35:41,958 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547883621] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:41,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488263369] [2023-11-23 20:35:41,959 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:35:41,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:41,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:41,960 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:41,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:35:42,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 20:35:42,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:35:42,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:35:42,084 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:42,095 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:35:42,096 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:42,114 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:35:42,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488263369] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:42,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133112589] [2023-11-23 20:35:42,118 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:35:42,118 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:42,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:35:42,119 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:35:42,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:35:43,108 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:35:43,771 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '563#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem17#1| |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_#t~mem17#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a7~0#1.base|) 0)) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem16#1|))' at error location [2023-11-23 20:35:43,772 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:35:43,772 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:43,772 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-23 20:35:43,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699884472] [2023-11-23 20:35:43,772 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:43,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 20:35:43,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:43,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 20:35:43,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:35:43,775 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:43,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:43,899 INFO L93 Difference]: Finished difference Result 56 states and 86 transitions. [2023-11-23 20:35:43,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:35:43,900 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 0 states have call successors, (0), 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 21 [2023-11-23 20:35:43,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:43,901 INFO L225 Difference]: With dead ends: 56 [2023-11-23 20:35:43,901 INFO L226 Difference]: Without dead ends: 41 [2023-11-23 20:35:43,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 51 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:35:43,903 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:43,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:43,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-23 20:35:43,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-23 20:35:43,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.2) internal successors, (48), 40 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:43,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2023-11-23 20:35:43,911 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 21 [2023-11-23 20:35:43,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:43,912 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2023-11-23 20:35:43,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:43,912 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2023-11-23 20:35:43,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-23 20:35:43,913 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:43,914 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:43,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:44,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:44,137 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:44,138 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:44,138 INFO L85 PathProgramCache]: Analyzing trace with hash 274253718, now seen corresponding path program 3 times [2023-11-23 20:35:44,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:44,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213415728] [2023-11-23 20:35:44,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:44,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:44,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:44,416 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-23 20:35:44,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:44,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213415728] [2023-11-23 20:35:44,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213415728] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:44,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984634290] [2023-11-23 20:35:44,417 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:35:44,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:44,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:44,418 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:44,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:35:44,555 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:35:44,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:35:44,557 INFO L262 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:35:44,563 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:44,578 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-23 20:35:44,578 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:44,635 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-23 20:35:44,635 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984634290] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:44,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [358908759] [2023-11-23 20:35:44,638 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:35:44,638 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:44,639 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:35:44,639 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:35:44,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:35:45,529 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:35:46,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '989#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem17#1| |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_#t~mem17#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a7~0#1.base|) 0)) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem16#1|))' at error location [2023-11-23 20:35:46,455 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:35:46,455 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:46,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-23 20:35:46,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481355826] [2023-11-23 20:35:46,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:46,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-23 20:35:46,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:46,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-23 20:35:46,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2023-11-23 20:35:46,457 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:46,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:46,531 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2023-11-23 20:35:46,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 20:35:46,532 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2023-11-23 20:35:46,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:46,533 INFO L225 Difference]: With dead ends: 82 [2023-11-23 20:35:46,533 INFO L226 Difference]: Without dead ends: 47 [2023-11-23 20:35:46,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 85 SyntacticMatches, 20 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2023-11-23 20:35:46,535 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:46,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:46,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-23 20:35:46,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-11-23 20:35:46,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.173913043478261) internal successors, (54), 46 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:46,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2023-11-23 20:35:46,543 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 39 [2023-11-23 20:35:46,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:46,544 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2023-11-23 20:35:46,544 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:46,544 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2023-11-23 20:35:46,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-23 20:35:46,546 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:46,546 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:46,572 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-23 20:35:46,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:46,768 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:46,768 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:46,768 INFO L85 PathProgramCache]: Analyzing trace with hash 160941590, now seen corresponding path program 4 times [2023-11-23 20:35:46,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:46,769 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774686305] [2023-11-23 20:35:46,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:46,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:46,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:47,130 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-23 20:35:47,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:47,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774686305] [2023-11-23 20:35:47,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774686305] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:47,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508222918] [2023-11-23 20:35:47,131 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 20:35:47,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:47,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:47,132 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:47,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:35:47,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:47,296 INFO L262 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 20:35:47,301 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:47,355 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-23 20:35:47,355 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:47,612 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-23 20:35:47,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508222918] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:47,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [455784850] [2023-11-23 20:35:47,615 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:35:47,615 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:47,616 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:35:47,616 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:35:47,616 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:35:48,544 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:35:49,422 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1527#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem17#1| |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_#t~mem17#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a7~0#1.base|) 0)) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem16#1|))' at error location [2023-11-23 20:35:49,422 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:35:49,422 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:49,422 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-23 20:35:49,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167608832] [2023-11-23 20:35:49,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:49,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 20:35:49,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:49,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 20:35:49,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=550, Unknown=0, NotChecked=0, Total=870 [2023-11-23 20:35:49,426 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand has 25 states, 25 states have (on average 1.64) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:49,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:49,545 INFO L93 Difference]: Finished difference Result 94 states and 119 transitions. [2023-11-23 20:35:49,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-23 20:35:49,546 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2023-11-23 20:35:49,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:49,547 INFO L225 Difference]: With dead ends: 94 [2023-11-23 20:35:49,547 INFO L226 Difference]: Without dead ends: 59 [2023-11-23 20:35:49,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 107 SyntacticMatches, 10 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=320, Invalid=550, Unknown=0, NotChecked=0, Total=870 [2023-11-23 20:35:49,550 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:49,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:49,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-23 20:35:49,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-11-23 20:35:49,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 58 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) [2023-11-23 20:35:49,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 66 transitions. [2023-11-23 20:35:49,559 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 66 transitions. Word has length 45 [2023-11-23 20:35:49,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:49,559 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 66 transitions. [2023-11-23 20:35:49,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:49,560 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 66 transitions. [2023-11-23 20:35:49,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-11-23 20:35:49,561 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:49,561 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:49,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:49,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 20:35:49,772 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:49,773 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:49,773 INFO L85 PathProgramCache]: Analyzing trace with hash -864869610, now seen corresponding path program 5 times [2023-11-23 20:35:49,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:49,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449561361] [2023-11-23 20:35:49,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:49,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:49,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:50,730 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-23 20:35:50,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:50,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449561361] [2023-11-23 20:35:50,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449561361] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:50,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836013091] [2023-11-23 20:35:50,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:35:50,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:50,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:50,732 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:50,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:35:50,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 20:35:50,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:35:50,985 INFO L262 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:35:50,988 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:51,067 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 303 trivial. 0 not checked. [2023-11-23 20:35:51,068 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:51,181 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 303 trivial. 0 not checked. [2023-11-23 20:35:51,182 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836013091] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:51,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1137269250] [2023-11-23 20:35:51,185 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:35:51,185 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:51,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:35:51,185 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:35:51,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:35:52,052 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:35:53,419 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2195#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem17#1| |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_#t~mem17#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a7~0#1.base|) 0)) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem16#1|))' at error location [2023-11-23 20:35:53,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:35:53,419 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:53,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 7, 7] total 35 [2023-11-23 20:35:53,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445910247] [2023-11-23 20:35:53,420 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:53,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-23 20:35:53,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:53,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-23 20:35:53,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=1175, Unknown=0, NotChecked=0, Total=1560 [2023-11-23 20:35:53,422 INFO L87 Difference]: Start difference. First operand 59 states and 66 transitions. Second operand has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:53,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:53,708 INFO L93 Difference]: Finished difference Result 131 states and 181 transitions. [2023-11-23 20:35:53,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-23 20:35:53,709 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2023-11-23 20:35:53,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:53,711 INFO L225 Difference]: With dead ends: 131 [2023-11-23 20:35:53,711 INFO L226 Difference]: Without dead ends: 96 [2023-11-23 20:35:53,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 140 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=385, Invalid=1175, Unknown=0, NotChecked=0, Total=1560 [2023-11-23 20:35:53,713 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:53,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 40 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:35:53,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-11-23 20:35:53,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2023-11-23 20:35:53,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0842105263157895) internal successors, (103), 95 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:53,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2023-11-23 20:35:53,727 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 57 [2023-11-23 20:35:53,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:53,727 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2023-11-23 20:35:53,727 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:53,728 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2023-11-23 20:35:53,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-11-23 20:35:53,729 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:53,729 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:53,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:53,949 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 20:35:53,949 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:53,950 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:53,950 INFO L85 PathProgramCache]: Analyzing trace with hash -1694331918, now seen corresponding path program 6 times [2023-11-23 20:35:53,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:53,951 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666172402] [2023-11-23 20:35:53,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:53,951 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:54,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:55,052 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-11-23 20:35:55,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:55,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666172402] [2023-11-23 20:35:55,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666172402] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:55,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621085438] [2023-11-23 20:35:55,053 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:35:55,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:55,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:55,056 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:55,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 20:35:55,329 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:35:55,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:35:55,334 INFO L262 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-23 20:35:55,339 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:55,406 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-11-23 20:35:55,406 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:35:56,308 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-11-23 20:35:56,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621085438] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:35:56,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504482581] [2023-11-23 20:35:56,311 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:35:56,311 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:35:56,312 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:35:56,312 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:35:56,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:35:57,133 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:35:59,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3249#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem17#1| |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_#t~mem17#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a7~0#1.base|) 0)) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem16#1|))' at error location [2023-11-23 20:35:59,760 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:35:59,760 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:35:59,761 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2023-11-23 20:35:59,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250513620] [2023-11-23 20:35:59,761 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:59,762 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-11-23 20:35:59,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:59,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-11-23 20:35:59,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1295, Invalid=1785, Unknown=0, NotChecked=0, Total=3080 [2023-11-23 20:35:59,766 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand has 51 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 50 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:59,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:59,916 INFO L93 Difference]: Finished difference Result 192 states and 230 transitions. [2023-11-23 20:35:59,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-11-23 20:35:59,916 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 50 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2023-11-23 20:35:59,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:59,918 INFO L225 Difference]: With dead ends: 192 [2023-11-23 20:35:59,919 INFO L226 Difference]: Without dead ends: 121 [2023-11-23 20:35:59,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 207 SyntacticMatches, 44 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3620 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1295, Invalid=1785, Unknown=0, NotChecked=0, Total=3080 [2023-11-23 20:35:59,923 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:59,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:59,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2023-11-23 20:35:59,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2023-11-23 20:35:59,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.0666666666666667) internal successors, (128), 120 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:59,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 128 transitions. [2023-11-23 20:35:59,957 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 128 transitions. Word has length 94 [2023-11-23 20:35:59,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:59,958 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 128 transitions. [2023-11-23 20:35:59,958 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 50 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:35:59,959 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 128 transitions. [2023-11-23 20:35:59,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-11-23 20:35:59,964 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:59,964 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:59,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 20:36:00,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:00,176 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:00,176 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:00,177 INFO L85 PathProgramCache]: Analyzing trace with hash 681239414, now seen corresponding path program 7 times [2023-11-23 20:36:00,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:00,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850430066] [2023-11-23 20:36:00,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:00,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:00,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:03,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-11-23 20:36:03,081 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:03,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850430066] [2023-11-23 20:36:03,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850430066] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:03,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745948119] [2023-11-23 20:36:03,082 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 20:36:03,082 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:03,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:03,092 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:03,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 20:36:03,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:03,434 INFO L262 TraceCheckSpWp]: Trace formula consists of 976 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-23 20:36:03,440 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:03,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-11-23 20:36:03,572 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:36:06,794 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-11-23 20:36:06,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745948119] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:36:06,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [897688308] [2023-11-23 20:36:06,797 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:36:06,797 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:36:06,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:36:06,798 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:36:06,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:36:07,500 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:36:10,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4675#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem17#1| |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_#t~mem17#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a7~0#1.base|) 0)) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem16#1|))' at error location [2023-11-23 20:36:10,950 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:36:10,950 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:36:10,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2023-11-23 20:36:10,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690850979] [2023-11-23 20:36:10,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:36:10,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-11-23 20:36:10,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:10,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-11-23 20:36:10,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5070, Invalid=6060, Unknown=0, NotChecked=0, Total=11130 [2023-11-23 20:36:10,959 INFO L87 Difference]: Start difference. First operand 121 states and 128 transitions. Second operand has 101 states, 101 states have (on average 1.1584158415841583) internal successors, (117), 100 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:36:11,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:11,179 INFO L93 Difference]: Finished difference Result 242 states and 305 transitions. [2023-11-23 20:36:11,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-11-23 20:36:11,180 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.1584158415841583) internal successors, (117), 100 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 119 [2023-11-23 20:36:11,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:11,181 INFO L225 Difference]: With dead ends: 242 [2023-11-23 20:36:11,182 INFO L226 Difference]: Without dead ends: 171 [2023-11-23 20:36:11,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 257 SyntacticMatches, 44 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7395 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=5070, Invalid=6060, Unknown=0, NotChecked=0, Total=11130 [2023-11-23 20:36:11,187 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:11,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:36:11,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2023-11-23 20:36:11,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2023-11-23 20:36:11,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.0470588235294118) internal successors, (178), 170 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:36:11,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 178 transitions. [2023-11-23 20:36:11,201 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 178 transitions. Word has length 119 [2023-11-23 20:36:11,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:11,202 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 178 transitions. [2023-11-23 20:36:11,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.1584158415841583) internal successors, (117), 100 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 20:36:11,202 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 178 transitions. [2023-11-23 20:36:11,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2023-11-23 20:36:11,205 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:11,205 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:11,232 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-23 20:36:11,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:11,424 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:11,424 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:11,424 INFO L85 PathProgramCache]: Analyzing trace with hash 2009151222, now seen corresponding path program 8 times [2023-11-23 20:36:11,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:11,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495236692] [2023-11-23 20:36:11,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:11,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:11,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:19,779 INFO L134 CoverageAnalysis]: Checked inductivity of 5181 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-11-23 20:36:19,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:19,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495236692] [2023-11-23 20:36:19,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495236692] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:19,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282852865] [2023-11-23 20:36:19,780 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:36:19,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:19,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:19,788 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:19,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4edf634a-b7d5-41bd-aee4-6f1411232e43/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process