./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91 --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 1caf94d5755d978efe1a3e5e557e469a697b8b845c60d509025c0b6bf4eae4ae --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:52:44,013 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:52:44,132 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:52:44,139 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:52:44,139 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:52:44,190 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:52:44,191 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:52:44,192 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:52:44,193 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:52:44,200 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:52:44,201 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:52:44,203 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:52:44,203 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:52:44,205 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:52:44,206 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:52:44,206 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:52:44,206 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:52:44,207 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:52:44,207 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:52:44,208 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:52:44,208 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:52:44,209 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:52:44,210 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:52:44,211 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:52:44,211 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:52:44,212 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:52:44,212 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:52:44,213 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:52:44,213 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:52:44,214 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:52:44,215 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:52:44,215 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:52:44,216 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:52:44,216 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:52:44,216 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:52:44,216 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:52:44,217 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:52:44,217 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:52:44,217 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:52:44,218 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:52:44,218 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:52:44,218 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:52:44,219 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:52:44,219 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:52:44,220 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:52:44,220 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:52:44,220 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:52:44,220 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_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1caf94d5755d978efe1a3e5e557e469a697b8b845c60d509025c0b6bf4eae4ae [2023-11-24 23:52:44,551 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:52:44,586 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:52:44,589 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:52:44,591 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:52:44,592 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:52:44,593 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/array-crafted/zero_sum5.c [2023-11-24 23:52:47,736 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:52:47,979 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:52:47,980 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/sv-benchmarks/c/array-crafted/zero_sum5.c [2023-11-24 23:52:47,989 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/data/762719d9b/7b8d72faf7de4749894717d27368cde6/FLAG14757186a [2023-11-24 23:52:48,007 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/data/762719d9b/7b8d72faf7de4749894717d27368cde6 [2023-11-24 23:52:48,010 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:52:48,012 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:52:48,013 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:52:48,014 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:52:48,020 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:52:48,021 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,022 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4402ef30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48, skipping insertion in model container [2023-11-24 23:52:48,023 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,051 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:52:48,255 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_60714b35-5aa2-4a91-927a-1f82e9cf35ab/sv-benchmarks/c/array-crafted/zero_sum5.c[400,413] [2023-11-24 23:52:48,314 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:52:48,330 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:52:48,349 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_60714b35-5aa2-4a91-927a-1f82e9cf35ab/sv-benchmarks/c/array-crafted/zero_sum5.c[400,413] [2023-11-24 23:52:48,388 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:52:48,406 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:52:48,407 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48 WrapperNode [2023-11-24 23:52:48,407 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:52:48,409 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:52:48,409 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:52:48,410 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:52:48,419 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,440 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,483 INFO L138 Inliner]: procedures = 15, calls = 21, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 152 [2023-11-24 23:52:48,484 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:52:48,485 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:52:48,485 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:52:48,486 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:52:48,496 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,497 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,516 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,516 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,524 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,544 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,546 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,554 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,556 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:52:48,557 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:52:48,558 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:52:48,563 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:52:48,564 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (1/1) ... [2023-11-24 23:52:48,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:52:48,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:48,612 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:52:48,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:52:48,743 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:52:48,743 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:52:48,743 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-24 23:52:48,743 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-24 23:52:48,743 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:52:48,744 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:52:48,744 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-24 23:52:48,744 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 23:52:48,872 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:52:48,874 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:52:49,243 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:52:49,352 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:52:49,356 INFO L309 CfgBuilder]: Removed 11 assume(true) statements. [2023-11-24 23:52:49,357 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:52:49 BoogieIcfgContainer [2023-11-24 23:52:49,358 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:52:49,360 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:52:49,360 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:52:49,364 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:52:49,364 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:52:48" (1/3) ... [2023-11-24 23:52:49,365 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20cdfe7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:52:49, skipping insertion in model container [2023-11-24 23:52:49,365 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:48" (2/3) ... [2023-11-24 23:52:49,366 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20cdfe7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:52:49, skipping insertion in model container [2023-11-24 23:52:49,366 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:52:49" (3/3) ... [2023-11-24 23:52:49,368 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum5.c [2023-11-24 23:52:49,385 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:52:49,385 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:52:49,436 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:52:49,444 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;@69b494a0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:52:49,445 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:52:49,450 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:49,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-24 23:52:49,455 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:49,456 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:49,456 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:49,461 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:49,461 INFO L85 PathProgramCache]: Analyzing trace with hash 964203512, now seen corresponding path program 1 times [2023-11-24 23:52:49,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:49,470 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768066220] [2023-11-24 23:52:49,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:49,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:49,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:49,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:52:49,851 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:49,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768066220] [2023-11-24 23:52:49,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768066220] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:49,852 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:52:49,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:52:49,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207412556] [2023-11-24 23:52:49,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:49,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:52:49,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:49,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:52:49,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:52:49,909 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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) [2023-11-24 23:52:50,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:50,025 INFO L93 Difference]: Finished difference Result 36 states and 59 transitions. [2023-11-24 23:52:50,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:52:50,028 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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 15 [2023-11-24 23:52:50,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:50,036 INFO L225 Difference]: With dead ends: 36 [2023-11-24 23:52:50,036 INFO L226 Difference]: Without dead ends: 17 [2023-11-24 23:52:50,039 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 [2023-11-24 23:52:50,044 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:50,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:52:50,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-24 23:52:50,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-24 23:52:50,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:50,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 27 transitions. [2023-11-24 23:52:50,086 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 27 transitions. Word has length 15 [2023-11-24 23:52:50,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:50,088 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 27 transitions. [2023-11-24 23:52:50,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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) [2023-11-24 23:52:50,088 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 27 transitions. [2023-11-24 23:52:50,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-24 23:52:50,090 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:50,090 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:50,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:52:50,091 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:50,091 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:50,092 INFO L85 PathProgramCache]: Analyzing trace with hash 278911161, now seen corresponding path program 1 times [2023-11-24 23:52:50,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:50,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558523631] [2023-11-24 23:52:50,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:50,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:50,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:50,266 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:52:50,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:50,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558523631] [2023-11-24 23:52:50,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558523631] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:50,267 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:52:50,267 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:52:50,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978293755] [2023-11-24 23:52:50,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:50,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:52:50,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:50,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:52:50,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:52:50,271 INFO L87 Difference]: Start difference. First operand 17 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:50,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:50,376 INFO L93 Difference]: Finished difference Result 39 states and 67 transitions. [2023-11-24 23:52:50,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:52:50,377 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-24 23:52:50,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:50,378 INFO L225 Difference]: With dead ends: 39 [2023-11-24 23:52:50,378 INFO L226 Difference]: Without dead ends: 27 [2023-11-24 23:52:50,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:52:50,381 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:50,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 5 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:52:50,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-24 23:52:50,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-24 23:52:50,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:50,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2023-11-24 23:52:50,395 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 16 [2023-11-24 23:52:50,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:50,395 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2023-11-24 23:52:50,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:50,397 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2023-11-24 23:52:50,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-24 23:52:50,398 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:50,398 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:50,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:52:50,399 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:50,399 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:50,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1909603372, now seen corresponding path program 1 times [2023-11-24 23:52:50,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:50,400 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921658451] [2023-11-24 23:52:50,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:50,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:50,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:50,591 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-24 23:52:50,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:50,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921658451] [2023-11-24 23:52:50,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1921658451] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:50,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941892841] [2023-11-24 23:52:50,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:50,594 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:50,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:50,599 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:50,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:52:50,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:50,721 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:52:50,728 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:50,822 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-24 23:52:50,822 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:52:50,867 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-24 23:52:50,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [941892841] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:52:50,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2112167945] [2023-11-24 23:52:50,906 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:52:50,906 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:52:50,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:52:50,919 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:52:50,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:52:51,770 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:52:51,927 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '392#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:52:51,933 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:52:51,933 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:52:51,933 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-24 23:52:51,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221776390] [2023-11-24 23:52:51,934 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:52:51,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:52:51,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:51,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:52:51,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-24 23:52:51,940 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:52,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:52,031 INFO L93 Difference]: Finished difference Result 51 states and 71 transitions. [2023-11-24 23:52:52,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:52:52,032 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2023-11-24 23:52:52,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:52,034 INFO L225 Difference]: With dead ends: 51 [2023-11-24 23:52:52,035 INFO L226 Difference]: Without dead ends: 28 [2023-11-24 23:52:52,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-24 23:52:52,040 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:52,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:52:52,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-24 23:52:52,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-11-24 23:52:52,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:52,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2023-11-24 23:52:52,057 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 26 [2023-11-24 23:52:52,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:52,057 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2023-11-24 23:52:52,057 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:52,058 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2023-11-24 23:52:52,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-24 23:52:52,058 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:52,058 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:52,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:52,265 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:52,266 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:52,266 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:52,266 INFO L85 PathProgramCache]: Analyzing trace with hash -2055099277, now seen corresponding path program 2 times [2023-11-24 23:52:52,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:52,267 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306604343] [2023-11-24 23:52:52,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:52,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:52,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:52,449 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-24 23:52:52,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:52,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306604343] [2023-11-24 23:52:52,450 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306604343] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:52,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403627738] [2023-11-24 23:52:52,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:52:52,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:52,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:52,453 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:52,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:52:52,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-24 23:52:52,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:52:52,568 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:52:52,571 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:52,640 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-24 23:52:52,640 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:52:52,692 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-24 23:52:52,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403627738] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:52:52,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [400022823] [2023-11-24 23:52:52,699 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:52:52,699 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:52:52,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:52:52,700 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:52:52,702 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:52:53,265 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:52:53,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '706#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:52:53,417 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:52:53,417 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:52:53,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-11-24 23:52:53,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974468095] [2023-11-24 23:52:53,418 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:52:53,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-24 23:52:53,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:53,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-24 23:52:53,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-11-24 23:52:53,421 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:53,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:53,556 INFO L93 Difference]: Finished difference Result 59 states and 87 transitions. [2023-11-24 23:52:53,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:52:53,557 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2023-11-24 23:52:53,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:53,559 INFO L225 Difference]: With dead ends: 59 [2023-11-24 23:52:53,560 INFO L226 Difference]: Without dead ends: 38 [2023-11-24 23:52:53,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-11-24 23:52:53,564 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:53,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 7 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:52:53,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-24 23:52:53,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-24 23:52:53,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 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) [2023-11-24 23:52:53,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2023-11-24 23:52:53,581 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 27 [2023-11-24 23:52:53,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:53,581 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2023-11-24 23:52:53,582 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.5) internal successors, (44), 8 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:53,582 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2023-11-24 23:52:53,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-24 23:52:53,584 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:53,584 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:53,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:53,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:53,791 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:53,791 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:53,792 INFO L85 PathProgramCache]: Analyzing trace with hash -181257608, now seen corresponding path program 3 times [2023-11-24 23:52:53,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:53,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548114991] [2023-11-24 23:52:53,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:53,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:54,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:57,865 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:52:57,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:57,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548114991] [2023-11-24 23:52:57,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548114991] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:57,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619550462] [2023-11-24 23:52:57,867 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-24 23:52:57,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:57,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:57,876 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:57,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:52:57,992 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-24 23:52:57,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:52:57,996 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 96 conjunts are in the unsatisfiable core [2023-11-24 23:52:58,003 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:58,053 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 15 treesize of output 1 [2023-11-24 23:52:58,301 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:52:58,302 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:52:58,535 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:52:58,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619550462] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:52:58,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1934280767] [2023-11-24 23:52:58,542 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:52:58,542 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:52:58,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:52:58,543 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:52:58,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:52:58,997 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:52:59,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1126#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:52:59,215 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:52:59,215 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:52:59,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 9] total 18 [2023-11-24 23:52:59,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340356370] [2023-11-24 23:52:59,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:52:59,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-24 23:52:59,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:59,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-24 23:52:59,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2023-11-24 23:52:59,218 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 18 states, 18 states have (on average 3.9444444444444446) internal successors, (71), 18 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:59,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:59,692 INFO L93 Difference]: Finished difference Result 69 states and 88 transitions. [2023-11-24 23:52:59,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-24 23:52:59,693 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.9444444444444446) internal successors, (71), 18 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2023-11-24 23:52:59,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:59,694 INFO L225 Difference]: With dead ends: 69 [2023-11-24 23:52:59,695 INFO L226 Difference]: Without dead ends: 66 [2023-11-24 23:52:59,695 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2023-11-24 23:52:59,696 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:59,696 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 23 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 23:52:59,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-24 23:52:59,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2023-11-24 23:52:59,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.3174603174603174) internal successors, (83), 63 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:59,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 83 transitions. [2023-11-24 23:52:59,718 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 83 transitions. Word has length 37 [2023-11-24 23:52:59,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:59,718 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 83 transitions. [2023-11-24 23:52:59,719 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.9444444444444446) internal successors, (71), 18 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:52:59,719 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 83 transitions. [2023-11-24 23:52:59,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-24 23:52:59,722 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:59,722 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:59,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:59,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:59,930 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:59,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:59,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1081948845, now seen corresponding path program 4 times [2023-11-24 23:52:59,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:59,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824529379] [2023-11-24 23:52:59,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:59,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:59,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:00,077 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-24 23:53:00,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:00,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824529379] [2023-11-24 23:53:00,078 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824529379] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:53:00,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945006276] [2023-11-24 23:53:00,079 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-24 23:53:00,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:00,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:00,080 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:00,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:53:00,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:00,192 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-24 23:53:00,194 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:00,251 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-24 23:53:00,252 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:00,301 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-24 23:53:00,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945006276] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:53:00,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2086498517] [2023-11-24 23:53:00,306 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:53:00,306 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:53:00,307 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:53:00,308 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:53:00,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:53:00,722 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:53:00,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1621#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:53:00,877 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:53:00,878 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:53:00,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-11-24 23:53:00,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627444241] [2023-11-24 23:53:00,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:53:00,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-24 23:53:00,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:00,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-24 23:53:00,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:53:00,880 INFO L87 Difference]: Start difference. First operand 64 states and 83 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:01,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:01,100 INFO L93 Difference]: Finished difference Result 126 states and 164 transitions. [2023-11-24 23:53:01,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-24 23:53:01,101 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2023-11-24 23:53:01,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:01,102 INFO L225 Difference]: With dead ends: 126 [2023-11-24 23:53:01,102 INFO L226 Difference]: Without dead ends: 65 [2023-11-24 23:53:01,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 100 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:53:01,104 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:01,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:53:01,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-24 23:53:01,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-11-24 23:53:01,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.3125) internal successors, (84), 64 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:01,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 84 transitions. [2023-11-24 23:53:01,117 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 84 transitions. Word has length 38 [2023-11-24 23:53:01,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:01,117 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 84 transitions. [2023-11-24 23:53:01,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:01,118 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 84 transitions. [2023-11-24 23:53:01,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-24 23:53:01,119 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:01,119 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:01,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:53:01,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-24 23:53:01,326 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:01,327 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:01,327 INFO L85 PathProgramCache]: Analyzing trace with hash -1265226548, now seen corresponding path program 5 times [2023-11-24 23:53:01,327 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:01,328 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815308589] [2023-11-24 23:53:01,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:01,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:01,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:01,506 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-24 23:53:01,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:01,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815308589] [2023-11-24 23:53:01,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815308589] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:53:01,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305180920] [2023-11-24 23:53:01,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:53:01,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:01,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:01,509 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:01,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:53:01,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-24 23:53:01,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:53:01,624 INFO L262 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-24 23:53:01,626 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:01,730 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-24 23:53:01,730 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:01,831 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-24 23:53:01,831 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305180920] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:53:01,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1492174656] [2023-11-24 23:53:01,834 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:53:01,834 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:53:01,835 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:53:01,835 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:53:01,835 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:53:02,181 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:53:02,325 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2237#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:53:02,326 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:53:02,326 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:53:02,326 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-24 23:53:02,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912260311] [2023-11-24 23:53:02,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:53:02,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-24 23:53:02,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:02,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-24 23:53:02,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2023-11-24 23:53:02,330 INFO L87 Difference]: Start difference. First operand 65 states and 84 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:02,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:02,498 INFO L93 Difference]: Finished difference Result 102 states and 138 transitions. [2023-11-24 23:53:02,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-24 23:53:02,499 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2023-11-24 23:53:02,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:02,499 INFO L225 Difference]: With dead ends: 102 [2023-11-24 23:53:02,500 INFO L226 Difference]: Without dead ends: 49 [2023-11-24 23:53:02,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 101 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2023-11-24 23:53:02,501 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:02,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 13 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:53:02,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-11-24 23:53:02,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-11-24 23:53:02,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:02,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2023-11-24 23:53:02,510 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 39 [2023-11-24 23:53:02,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:02,511 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2023-11-24 23:53:02,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:02,511 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2023-11-24 23:53:02,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-24 23:53:02,512 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:02,512 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:02,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:53:02,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:53:02,713 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:02,713 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:02,714 INFO L85 PathProgramCache]: Analyzing trace with hash 1273844948, now seen corresponding path program 6 times [2023-11-24 23:53:02,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:02,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799078472] [2023-11-24 23:53:02,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:02,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:02,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:08,506 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:53:08,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:08,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799078472] [2023-11-24 23:53:08,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799078472] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:53:08,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575449138] [2023-11-24 23:53:08,507 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-24 23:53:08,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:08,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:08,508 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:08,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:53:08,634 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-24 23:53:08,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:53:08,640 WARN L260 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 138 conjunts are in the unsatisfiable core [2023-11-24 23:53:08,646 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:08,674 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 15 treesize of output 1 [2023-11-24 23:53:09,247 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:53:09,248 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:09,856 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:53:09,857 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [575449138] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:53:09,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980798755] [2023-11-24 23:53:09,859 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:53:09,859 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:53:09,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:53:09,860 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:53:09,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:53:10,263 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:53:10,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2862#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:53:10,654 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:53:10,654 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:53:10,654 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 15, 11] total 47 [2023-11-24 23:53:10,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621020988] [2023-11-24 23:53:10,655 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:53:10,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-11-24 23:53:10,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:10,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-11-24 23:53:10,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=2453, Unknown=0, NotChecked=0, Total=2652 [2023-11-24 23:53:10,658 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 47 states, 47 states have (on average 2.74468085106383) internal successors, (129), 47 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:15,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:15,309 INFO L93 Difference]: Finished difference Result 207 states and 260 transitions. [2023-11-24 23:53:15,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-11-24 23:53:15,309 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.74468085106383) internal successors, (129), 47 states have internal predecessors, (129), 0 states have call successors, (0), 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 48 [2023-11-24 23:53:15,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:15,316 INFO L225 Difference]: With dead ends: 207 [2023-11-24 23:53:15,316 INFO L226 Difference]: Without dead ends: 143 [2023-11-24 23:53:15,325 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=582, Invalid=5424, Unknown=0, NotChecked=0, Total=6006 [2023-11-24 23:53:15,326 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 35 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 2765 mSolverCounterSat, 486 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 3251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 486 IncrementalHoareTripleChecker+Valid, 2765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:15,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 133 Invalid, 3251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [486 Valid, 2765 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2023-11-24 23:53:15,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-11-24 23:53:15,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 111. [2023-11-24 23:53:15,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.2636363636363637) internal successors, (139), 110 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:15,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 139 transitions. [2023-11-24 23:53:15,382 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 139 transitions. Word has length 48 [2023-11-24 23:53:15,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:15,382 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 139 transitions. [2023-11-24 23:53:15,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.74468085106383) internal successors, (129), 47 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:15,382 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 139 transitions. [2023-11-24 23:53:15,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-24 23:53:15,390 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:15,390 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:15,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 23:53:15,599 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-24 23:53:15,599 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:15,600 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:15,600 INFO L85 PathProgramCache]: Analyzing trace with hash 1755909761, now seen corresponding path program 7 times [2023-11-24 23:53:15,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:15,600 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987967477] [2023-11-24 23:53:15,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:15,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:15,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:15,796 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-24 23:53:15,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:15,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987967477] [2023-11-24 23:53:15,796 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987967477] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:53:15,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388038939] [2023-11-24 23:53:15,797 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-24 23:53:15,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:15,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:15,799 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:15,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 23:53:15,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:15,918 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-24 23:53:15,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:16,013 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-24 23:53:16,013 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:16,094 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-24 23:53:16,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388038939] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:53:16,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [99054856] [2023-11-24 23:53:16,101 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:53:16,101 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:53:16,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:53:16,102 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:53:16,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:53:16,450 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:53:16,602 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3848#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:53:16,602 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:53:16,602 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:53:16,602 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-11-24 23:53:16,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323318200] [2023-11-24 23:53:16,603 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:53:16,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-24 23:53:16,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:16,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-24 23:53:16,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2023-11-24 23:53:16,604 INFO L87 Difference]: Start difference. First operand 111 states and 139 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:16,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:16,826 INFO L93 Difference]: Finished difference Result 156 states and 201 transitions. [2023-11-24 23:53:16,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-24 23:53:16,827 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2023-11-24 23:53:16,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:16,827 INFO L225 Difference]: With dead ends: 156 [2023-11-24 23:53:16,827 INFO L226 Difference]: Without dead ends: 65 [2023-11-24 23:53:16,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 131 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2023-11-24 23:53:16,829 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:16,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 11 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:53:16,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-24 23:53:16,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2023-11-24 23:53:16,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:16,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2023-11-24 23:53:16,843 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 50 [2023-11-24 23:53:16,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:16,845 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2023-11-24 23:53:16,846 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 17 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:53:16,846 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2023-11-24 23:53:16,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-11-24 23:53:16,846 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:16,847 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:16,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-24 23:53:17,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-24 23:53:17,053 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:17,053 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:17,053 INFO L85 PathProgramCache]: Analyzing trace with hash 824189176, now seen corresponding path program 8 times [2023-11-24 23:53:17,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:17,054 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945045730] [2023-11-24 23:53:17,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:17,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:17,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:26,552 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 1 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:53:26,552 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:26,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945045730] [2023-11-24 23:53:26,552 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945045730] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:53:26,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403448699] [2023-11-24 23:53:26,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:53:26,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:26,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:26,554 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:26,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60714b35-5aa2-4a91-927a-1f82e9cf35ab/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-24 23:53:26,684 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-24 23:53:26,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:53:26,689 WARN L260 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 188 conjunts are in the unsatisfiable core [2023-11-24 23:53:26,699 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:26,727 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 19 treesize of output 1 [2023-11-24 23:53:29,247 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:53:29,248 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 14 [2023-11-24 23:53:29,391 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 4 proven. 100 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:53:29,391 INFO L327 TraceCheckSpWp]: Computing backward predicates...