./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/nr5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/nr5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ --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 7a05e17fa6f76d5004d5085f0b83441da7dbecb194f05c3b661e69c00b5f4df0 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:12:48,806 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:12:48,940 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:12:48,952 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:12:48,953 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:12:48,986 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:12:48,987 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:12:48,988 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:12:48,989 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:12:48,994 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:12:48,995 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:12:48,995 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:12:48,996 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:12:48,998 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:12:48,998 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:12:48,999 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:12:48,999 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:12:49,000 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:12:49,001 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:12:49,002 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:12:49,002 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:12:49,003 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:12:49,004 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:12:49,005 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:12:49,005 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:12:49,006 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:12:49,006 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:12:49,007 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:12:49,007 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:12:49,008 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:12:49,009 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:12:49,010 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:12:49,010 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:12:49,011 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:12:49,011 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:12:49,011 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:12:49,012 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:12:49,012 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:12:49,012 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:12:49,013 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:12:49,013 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:12:49,014 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:12:49,014 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:12:49,014 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:12:49,015 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:12:49,015 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_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7a05e17fa6f76d5004d5085f0b83441da7dbecb194f05c3b661e69c00b5f4df0 [2023-11-19 05:12:49,346 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:12:49,377 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:12:49,379 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:12:49,381 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:12:49,381 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:12:49,384 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-tiling/nr5.c [2023-11-19 05:12:52,636 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:12:52,945 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:12:52,946 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/sv-benchmarks/c/array-tiling/nr5.c [2023-11-19 05:12:52,955 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/data/98522148a/5fd2ca031cd44b8eb707e9b266a1970d/FLAGfc3660853 [2023-11-19 05:12:52,976 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/data/98522148a/5fd2ca031cd44b8eb707e9b266a1970d [2023-11-19 05:12:52,983 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:12:52,985 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:12:52,991 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:12:52,991 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:12:52,998 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:12:52,999 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:12:52" (1/1) ... [2023-11-19 05:12:53,000 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46572989 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53, skipping insertion in model container [2023-11-19 05:12:53,001 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:12:52" (1/1) ... [2023-11-19 05:12:53,031 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:12:53,239 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_38e4efbb-8f35-48ac-827a-8c93e86236e6/sv-benchmarks/c/array-tiling/nr5.c[394,407] [2023-11-19 05:12:53,268 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:12:53,282 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:12:53,303 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_38e4efbb-8f35-48ac-827a-8c93e86236e6/sv-benchmarks/c/array-tiling/nr5.c[394,407] [2023-11-19 05:12:53,312 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:12:53,329 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:12:53,330 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53 WrapperNode [2023-11-19 05:12:53,330 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:12:53,332 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:12:53,332 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:12:53,332 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:12:53,341 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,350 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,377 INFO L138 Inliner]: procedures = 15, calls = 22, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 81 [2023-11-19 05:12:53,378 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:12:53,379 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:12:53,379 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:12:53,379 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:12:53,390 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,390 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,393 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,393 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,401 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,407 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,409 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,410 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,413 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:12:53,414 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:12:53,415 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:12:53,415 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:12:53,416 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (1/1) ... [2023-11-19 05:12:53,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:12:53,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:12:53,457 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:12:53,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:12:53,501 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:12:53,502 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:12:53,502 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:12:53,502 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:12:53,502 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:12:53,502 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:12:53,503 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:12:53,503 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:12:53,583 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:12:53,586 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:12:53,802 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:12:53,892 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:12:53,892 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 05:12:53,897 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:12:53 BoogieIcfgContainer [2023-11-19 05:12:53,898 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:12:53,901 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:12:53,902 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:12:53,906 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:12:53,906 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:12:52" (1/3) ... [2023-11-19 05:12:53,907 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ebad5e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:12:53, skipping insertion in model container [2023-11-19 05:12:53,907 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:12:53" (2/3) ... [2023-11-19 05:12:53,908 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ebad5e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:12:53, skipping insertion in model container [2023-11-19 05:12:53,908 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:12:53" (3/3) ... [2023-11-19 05:12:53,910 INFO L112 eAbstractionObserver]: Analyzing ICFG nr5.c [2023-11-19 05:12:53,934 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:12:53,934 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:12:53,987 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:12:53,994 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;@7ca59c22, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:12:53,994 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:12:53,999 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:54,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:12:54,029 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:12:54,030 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:12:54,031 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:12:54,037 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:12:54,037 INFO L85 PathProgramCache]: Analyzing trace with hash -1530238989, now seen corresponding path program 1 times [2023-11-19 05:12:54,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:12:54,048 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829797596] [2023-11-19 05:12:54,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:12:54,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:12:54,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:12:54,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:12:54,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:12:54,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829797596] [2023-11-19 05:12:54,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829797596] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:12:54,711 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:12:54,712 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:12:54,714 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133734072] [2023-11-19 05:12:54,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:12:54,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:12:54,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:12:54,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:12:54,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:12:54,777 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:54,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:12:54,907 INFO L93 Difference]: Finished difference Result 26 states and 33 transitions. [2023-11-19 05:12:54,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:12:54,911 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 05:12:54,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:12:54,923 INFO L225 Difference]: With dead ends: 26 [2023-11-19 05:12:54,923 INFO L226 Difference]: Without dead ends: 12 [2023-11-19 05:12:54,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:12:54,935 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 18 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:12:54,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 12 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:12:54,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-19 05:12:54,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2023-11-19 05:12:54,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:54,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2023-11-19 05:12:54,989 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 7 [2023-11-19 05:12:54,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:12:54,990 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2023-11-19 05:12:54,991 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:54,992 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2023-11-19 05:12:54,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:12:54,993 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:12:54,993 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:12:54,994 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:12:54,994 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:12:54,996 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:12:54,996 INFO L85 PathProgramCache]: Analyzing trace with hash 646031458, now seen corresponding path program 1 times [2023-11-19 05:12:54,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:12:54,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525206462] [2023-11-19 05:12:54,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:12:54,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:12:55,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:12:55,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:12:55,156 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:12:55,156 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525206462] [2023-11-19 05:12:55,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525206462] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:12:55,158 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:12:55,158 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:12:55,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759397421] [2023-11-19 05:12:55,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:12:55,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:12:55,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:12:55,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:12:55,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:12:55,164 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:55,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:12:55,211 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2023-11-19 05:12:55,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:12:55,212 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 05:12:55,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:12:55,213 INFO L225 Difference]: With dead ends: 19 [2023-11-19 05:12:55,213 INFO L226 Difference]: Without dead ends: 12 [2023-11-19 05:12:55,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:12:55,216 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:12:55,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:12:55,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-19 05:12:55,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-19 05:12:55,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:55,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2023-11-19 05:12:55,225 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2023-11-19 05:12:55,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:12:55,225 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2023-11-19 05:12:55,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:55,226 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2023-11-19 05:12:55,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 05:12:55,226 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:12:55,227 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:12:55,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:12:55,227 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:12:55,228 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:12:55,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1553202252, now seen corresponding path program 1 times [2023-11-19 05:12:55,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:12:55,229 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924309978] [2023-11-19 05:12:55,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:12:55,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:12:55,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:12:55,312 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:12:55,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:12:55,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924309978] [2023-11-19 05:12:55,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924309978] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:12:55,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320741279] [2023-11-19 05:12:55,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:12:55,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:12:55,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:12:55,317 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:12:55,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:12:55,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:12:55,422 INFO L262 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:12:55,428 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:12:55,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:12:55,471 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:12:55,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:12:55,496 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320741279] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:12:55,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527230878] [2023-11-19 05:12:55,521 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:12:55,521 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:12:55,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:12:55,532 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:12:55,532 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:12:56,806 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:12:57,931 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '175#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:12:57,931 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:12:57,931 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:12:57,932 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-19 05:12:57,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542119320] [2023-11-19 05:12:57,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:12:57,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:12:57,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:12:57,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:12:57,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:12:57,935 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:57,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:12:57,972 INFO L93 Difference]: Finished difference Result 23 states and 30 transitions. [2023-11-19 05:12:57,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:12:57,973 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-19 05:12:57,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:12:57,973 INFO L225 Difference]: With dead ends: 23 [2023-11-19 05:12:57,974 INFO L226 Difference]: Without dead ends: 15 [2023-11-19 05:12:57,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:12:57,976 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:12:57,977 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:12:57,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-19 05:12:57,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-19 05:12:57,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:57,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2023-11-19 05:12:57,984 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2023-11-19 05:12:57,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:12:57,985 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2023-11-19 05:12:57,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:12:57,985 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2023-11-19 05:12:57,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:12:57,986 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:12:57,987 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:12:58,012 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 05:12:58,209 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:12:58,210 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:12:58,210 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:12:58,210 INFO L85 PathProgramCache]: Analyzing trace with hash 1004989666, now seen corresponding path program 2 times [2023-11-19 05:12:58,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:12:58,211 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587455935] [2023-11-19 05:12:58,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:12:58,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:12:58,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:12:58,387 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:12:58,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:12:58,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587455935] [2023-11-19 05:12:58,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587455935] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:12:58,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539701894] [2023-11-19 05:12:58,392 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:12:58,394 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:12:58,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:12:58,396 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:12:58,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:12:58,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-19 05:12:58,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:12:58,492 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:12:58,495 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:12:58,520 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:12:58,520 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:12:58,555 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:12:58,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539701894] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:12:58,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [202244926] [2023-11-19 05:12:58,560 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:12:58,561 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:12:58,561 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:12:58,562 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:12:58,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:12:59,232 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:13:00,213 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '320#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:13:00,213 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:13:00,214 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:13:00,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 8 [2023-11-19 05:13:00,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103212564] [2023-11-19 05:13:00,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:13:00,215 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:13:00,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:00,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:13:00,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:13:00,217 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:13:00,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:00,265 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2023-11-19 05:13:00,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:13:00,266 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:13:00,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:00,267 INFO L225 Difference]: With dead ends: 27 [2023-11-19 05:13:00,267 INFO L226 Difference]: Without dead ends: 16 [2023-11-19 05:13:00,268 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:13:00,269 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:00,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:13:00,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-19 05:13:00,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-19 05:13:00,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:13:00,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2023-11-19 05:13:00,277 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 13 [2023-11-19 05:13:00,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:00,277 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2023-11-19 05:13:00,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:13:00,278 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2023-11-19 05:13:00,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 05:13:00,279 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:00,279 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:13:00,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:13:00,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:00,501 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:00,501 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:00,501 INFO L85 PathProgramCache]: Analyzing trace with hash 984567604, now seen corresponding path program 3 times [2023-11-19 05:13:00,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:00,502 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877514900] [2023-11-19 05:13:00,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:00,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:00,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:01,692 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:13:01,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:01,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877514900] [2023-11-19 05:13:01,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877514900] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:01,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891862693] [2023-11-19 05:13:01,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:13:01,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:01,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:01,695 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:01,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:13:01,792 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:13:01,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:13:01,798 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-19 05:13:01,803 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:13:01,863 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:13:01,892 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-19 05:13:01,951 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:01,952 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 28 [2023-11-19 05:13:02,018 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:02,018 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 38 [2023-11-19 05:13:02,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:02,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:02,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:02,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:02,102 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:02,102 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 44 treesize of output 52 [2023-11-19 05:13:02,334 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:13:02,334 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:13:02,480 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-19 05:13:02,605 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 37 [2023-11-19 05:13:02,952 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:02,952 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-11-19 05:13:02,966 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:02,966 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2023-11-19 05:13:03,011 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 139 [2023-11-19 05:13:03,051 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:03,052 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18992 treesize of output 18865 [2023-11-19 05:13:03,283 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:13:03,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1891862693] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:13:03,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [618582218] [2023-11-19 05:13:03,286 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:13:03,287 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:13:03,287 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:13:03,288 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:13:03,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:13:03,912 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:13:05,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '501#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:13:05,133 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:13:05,133 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:13:05,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 28 [2023-11-19 05:13:05,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672090087] [2023-11-19 05:13:05,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:13:05,134 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-19 05:13:05,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:05,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-19 05:13:05,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1015, Unknown=0, NotChecked=0, Total=1190 [2023-11-19 05:13:05,136 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:13:06,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:06,459 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2023-11-19 05:13:06,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-19 05:13:06,460 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-19 05:13:06,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:06,462 INFO L225 Difference]: With dead ends: 48 [2023-11-19 05:13:06,462 INFO L226 Difference]: Without dead ends: 46 [2023-11-19 05:13:06,463 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=409, Invalid=2041, Unknown=0, NotChecked=0, Total=2450 [2023-11-19 05:13:06,465 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 105 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:06,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 23 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:13:06,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-19 05:13:06,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 31. [2023-11-19 05:13:06,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:13:06,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-11-19 05:13:06,480 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 14 [2023-11-19 05:13:06,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:06,481 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-11-19 05:13:06,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:13:06,481 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-11-19 05:13:06,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 05:13:06,482 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:06,483 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:13:06,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:13:06,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:06,698 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:06,698 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:06,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1311157345, now seen corresponding path program 1 times [2023-11-19 05:13:06,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:06,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875688118] [2023-11-19 05:13:06,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:06,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:06,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:07,739 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:13:07,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:07,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875688118] [2023-11-19 05:13:07,740 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875688118] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:07,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325746464] [2023-11-19 05:13:07,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:07,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:07,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:07,742 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:07,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:13:07,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:07,850 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-19 05:13:07,862 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:13:07,951 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:13:07,978 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2023-11-19 05:13:07,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:07,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:07,987 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 22 [2023-11-19 05:13:08,424 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:13:08,424 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:13:08,692 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-19 05:13:08,760 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:08,760 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-11-19 05:13:08,781 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:08,781 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2023-11-19 05:13:08,845 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 90 [2023-11-19 05:13:08,852 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 98 [2023-11-19 05:13:08,885 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:08,885 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 94 [2023-11-19 05:13:09,153 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:13:09,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325746464] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:13:09,154 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1500109690] [2023-11-19 05:13:09,156 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 05:13:09,156 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:13:09,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:13:09,157 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:13:09,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:13:09,873 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:13:11,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '828#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 05:13:11,190 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:13:11,191 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:13:11,191 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 33 [2023-11-19 05:13:11,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713968933] [2023-11-19 05:13:11,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:13:11,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-11-19 05:13:11,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:11,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-11-19 05:13:11,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1455, Unknown=0, NotChecked=0, Total=1640 [2023-11-19 05:13:11,194 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 33 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) [2023-11-19 05:13:13,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:13,425 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2023-11-19 05:13:13,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-11-19 05:13:13,426 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 33 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 23 [2023-11-19 05:13:13,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:13,429 INFO L225 Difference]: With dead ends: 78 [2023-11-19 05:13:13,431 INFO L226 Difference]: Without dead ends: 76 [2023-11-19 05:13:13,435 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1594 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=654, Invalid=4458, Unknown=0, NotChecked=0, Total=5112 [2023-11-19 05:13:13,437 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 179 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:13,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 147 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 05:13:13,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-19 05:13:13,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 42. [2023-11-19 05:13:13,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 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) [2023-11-19 05:13:13,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2023-11-19 05:13:13,463 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 23 [2023-11-19 05:13:13,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:13,464 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2023-11-19 05:13:13,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 33 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) [2023-11-19 05:13:13,464 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2023-11-19 05:13:13,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 05:13:13,465 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:13,466 INFO L195 NwaCegarLoop]: trace histogram [10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:13:13,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-19 05:13:13,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 05:13:13,670 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:13,670 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:13,670 INFO L85 PathProgramCache]: Analyzing trace with hash -343667902, now seen corresponding path program 2 times [2023-11-19 05:13:13,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:13,671 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794140464] [2023-11-19 05:13:13,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:13,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:13,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:15,909 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:13:15,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:15,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794140464] [2023-11-19 05:13:15,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [794140464] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:15,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092433234] [2023-11-19 05:13:15,909 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:13:15,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:15,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:15,911 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:15,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38e4efbb-8f35-48ac-827a-8c93e86236e6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:13:16,119 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-11-19 05:13:16,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:13:16,123 INFO L262 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 61 conjunts are in the unsatisfiable core [2023-11-19 05:13:16,129 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:13:16,252 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:13:16,312 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-19 05:13:16,370 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:16,370 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 28 [2023-11-19 05:13:16,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,454 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:16,455 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 42 [2023-11-19 05:13:16,606 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 70 [2023-11-19 05:13:16,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,684 INFO L349 Elim1Store]: treesize reduction 78, result has 46.2 percent of original size [2023-11-19 05:13:16,684 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 42 treesize of output 95 [2023-11-19 05:13:16,790 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 73 [2023-11-19 05:13:16,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:13:16,838 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:16,838 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 73 treesize of output 102 [2023-11-19 05:13:17,082 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 122 treesize of output 122 [2023-11-19 05:13:17,219 INFO L349 Elim1Store]: treesize reduction 120, result has 43.1 percent of original size [2023-11-19 05:13:17,220 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 11 case distinctions, treesize of input 94 treesize of output 176 [2023-11-19 05:13:17,966 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 245 treesize of output 205 [2023-11-19 05:13:18,164 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:13:18,165 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 3 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 25 case distinctions, treesize of input 205 treesize of output 379 [2023-11-19 05:13:37,141 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 381 treesize of output 339 [2023-11-19 05:13:41,822 INFO L349 Elim1Store]: treesize reduction 296, result has 78.6 percent of original size [2023-11-19 05:13:41,823 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 14 select indices, 14 select index equivalence classes, 10 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 95 case distinctions, treesize of input 311 treesize of output 1298