./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_tiling_tcpy.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/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_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_tiling_tcpy.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/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_4cc95b7c-465c-48f7-aa36-0ea983ca8264/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 5446997f7b2d7b76d63a39784df785fb06bbab562e365ba547eeee8a855e283e --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-25 00:02:45,760 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-25 00:02:45,834 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-25 00:02:45,840 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-25 00:02:45,841 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-25 00:02:45,868 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-25 00:02:45,868 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-25 00:02:45,869 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-25 00:02:45,870 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-25 00:02:45,870 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-25 00:02:45,871 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-25 00:02:45,871 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-25 00:02:45,872 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-25 00:02:45,872 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-25 00:02:45,873 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-25 00:02:45,873 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-25 00:02:45,874 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-25 00:02:45,874 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-25 00:02:45,875 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-25 00:02:45,875 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-25 00:02:45,876 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-25 00:02:45,876 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-25 00:02:45,877 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-25 00:02:45,878 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-25 00:02:45,878 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-25 00:02:45,878 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-25 00:02:45,879 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-25 00:02:45,879 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-25 00:02:45,879 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-25 00:02:45,880 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-25 00:02:45,880 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-25 00:02:45,881 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-25 00:02:45,881 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-25 00:02:45,881 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-25 00:02:45,882 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-25 00:02:45,882 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-25 00:02:45,882 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-25 00:02:45,882 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:02:45,882 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-25 00:02:45,883 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-25 00:02:45,883 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-25 00:02:45,883 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-25 00:02:45,883 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-25 00:02:45,884 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-25 00:02:45,884 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-25 00:02:45,884 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-25 00:02:45,884 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-25 00:02:45,884 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_4cc95b7c-465c-48f7-aa36-0ea983ca8264/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5446997f7b2d7b76d63a39784df785fb06bbab562e365ba547eeee8a855e283e [2023-11-25 00:02:46,197 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-25 00:02:46,231 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-25 00:02:46,234 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-25 00:02:46,237 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-25 00:02:46,237 INFO L274 PluginConnector]: CDTParser initialized [2023-11-25 00:02:46,239 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/array-cav19/array_tiling_tcpy.c [2023-11-25 00:02:49,595 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-25 00:02:49,778 INFO L384 CDTParser]: Found 1 translation units. [2023-11-25 00:02:49,779 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/sv-benchmarks/c/array-cav19/array_tiling_tcpy.c [2023-11-25 00:02:49,787 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/data/776333a39/5e4acec56339467c989ae5df32847855/FLAGb7a0f9d2c [2023-11-25 00:02:49,803 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/data/776333a39/5e4acec56339467c989ae5df32847855 [2023-11-25 00:02:49,805 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-25 00:02:49,807 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-25 00:02:49,808 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-25 00:02:49,809 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-25 00:02:49,818 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-25 00:02:49,819 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:02:49" (1/1) ... [2023-11-25 00:02:49,820 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66b013d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:49, skipping insertion in model container [2023-11-25 00:02:49,820 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:02:49" (1/1) ... [2023-11-25 00:02:49,845 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-25 00:02:50,005 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_4cc95b7c-465c-48f7-aa36-0ea983ca8264/sv-benchmarks/c/array-cav19/array_tiling_tcpy.c[408,421] [2023-11-25 00:02:50,027 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:02:50,039 INFO L202 MainTranslator]: Completed pre-run [2023-11-25 00:02:50,055 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_4cc95b7c-465c-48f7-aa36-0ea983ca8264/sv-benchmarks/c/array-cav19/array_tiling_tcpy.c[408,421] [2023-11-25 00:02:50,077 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:02:50,096 INFO L206 MainTranslator]: Completed translation [2023-11-25 00:02:50,096 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50 WrapperNode [2023-11-25 00:02:50,096 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-25 00:02:50,098 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-25 00:02:50,098 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-25 00:02:50,099 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-25 00:02:50,108 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,115 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,138 INFO L138 Inliner]: procedures = 15, calls = 22, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 60 [2023-11-25 00:02:50,138 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-25 00:02:50,139 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-25 00:02:50,139 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-25 00:02:50,139 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-25 00:02:50,151 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,151 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,154 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,154 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,161 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,166 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,167 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,168 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,174 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-25 00:02:50,177 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-25 00:02:50,178 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-25 00:02:50,179 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-25 00:02:50,180 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (1/1) ... [2023-11-25 00:02:50,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:02:50,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:02:50,232 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-25 00:02:50,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-25 00:02:50,279 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-25 00:02:50,280 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-25 00:02:50,281 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-25 00:02:50,281 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-25 00:02:50,283 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-25 00:02:50,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-25 00:02:50,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-25 00:02:50,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-25 00:02:50,285 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-25 00:02:50,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-25 00:02:50,360 INFO L241 CfgBuilder]: Building ICFG [2023-11-25 00:02:50,363 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-25 00:02:50,546 INFO L282 CfgBuilder]: Performing block encoding [2023-11-25 00:02:50,595 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-25 00:02:50,595 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-25 00:02:50,597 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:02:50 BoogieIcfgContainer [2023-11-25 00:02:50,597 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-25 00:02:50,600 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-25 00:02:50,601 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-25 00:02:50,605 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-25 00:02:50,605 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 12:02:49" (1/3) ... [2023-11-25 00:02:50,606 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58efe4f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:02:50, skipping insertion in model container [2023-11-25 00:02:50,606 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:50" (2/3) ... [2023-11-25 00:02:50,607 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58efe4f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:02:50, skipping insertion in model container [2023-11-25 00:02:50,607 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:02:50" (3/3) ... [2023-11-25 00:02:50,609 INFO L112 eAbstractionObserver]: Analyzing ICFG array_tiling_tcpy.c [2023-11-25 00:02:50,632 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-25 00:02:50,632 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-25 00:02:50,688 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-25 00:02:50,697 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;@67fea566, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-25 00:02:50,697 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-25 00:02:50,702 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:02:50,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-25 00:02:50,712 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:02:50,712 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:02:50,713 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:02:50,719 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:02:50,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1388210206, now seen corresponding path program 1 times [2023-11-25 00:02:50,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:02:50,731 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037898388] [2023-11-25 00:02:50,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:02:50,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:02:50,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:02:51,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-25 00:02:51,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:02:51,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037898388] [2023-11-25 00:02:51,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037898388] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:02:51,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:02:51,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-25 00:02:51,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194672055] [2023-11-25 00:02:51,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:02:51,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-25 00:02:51,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:02:51,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-25 00:02:51,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-25 00:02:51,157 INFO L87 Difference]: Start difference. First operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:02:51,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:02:51,209 INFO L93 Difference]: Finished difference Result 26 states and 34 transitions. [2023-11-25 00:02:51,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-25 00:02:51,212 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 12 [2023-11-25 00:02:51,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:02:51,221 INFO L225 Difference]: With dead ends: 26 [2023-11-25 00:02:51,221 INFO L226 Difference]: Without dead ends: 18 [2023-11-25 00:02:51,224 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 [2023-11-25 00:02:51,229 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:02:51,230 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 18 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:02:51,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-25 00:02:51,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2023-11-25 00:02:51,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:02:51,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2023-11-25 00:02:51,268 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 12 [2023-11-25 00:02:51,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:02:51,270 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2023-11-25 00:02:51,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-25 00:02:51,271 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2023-11-25 00:02:51,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-25 00:02:51,272 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:02:51,272 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:02:51,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-25 00:02:51,273 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:02:51,274 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:02:51,274 INFO L85 PathProgramCache]: Analyzing trace with hash 81444339, now seen corresponding path program 1 times [2023-11-25 00:02:51,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:02:51,274 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6668057] [2023-11-25 00:02:51,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:02:51,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:02:51,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:02:52,027 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-25 00:02:52,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:02:52,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6668057] [2023-11-25 00:02:52,029 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [6668057] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:02:52,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558123642] [2023-11-25 00:02:52,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:02:52,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:02:52,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:02:52,033 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:02:52,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-25 00:02:52,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:02:52,136 INFO L262 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-25 00:02:52,142 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:02:52,239 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:02:52,239 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:02:52,314 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:02:52,314 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558123642] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:02:52,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41721844] [2023-11-25 00:02:52,337 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-25 00:02:52,337 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:02:52,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:02:52,344 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:02:52,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:02:54,063 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 63 for LOIs [2023-11-25 00:02:54,119 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:02:55,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '158#(and (= |ULTIMATE.start_main_~i~0#1| 0) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|)) (exists ((|v_ULTIMATE.start_main_~i~0#1_43| Int)) (and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~S~0#1| 1073741822) (= |ULTIMATE.start_main_~#acopy~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#acopy~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (<= 2 |ULTIMATE.start_main_~S~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= |ULTIMATE.start_main_~S~0#1| |v_ULTIMATE.start_main_~i~0#1_43|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#acopy~0#1.base|) |ULTIMATE.start_main_~#acopy~0#1.offset|)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-25 00:02:55,388 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:02:55,388 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:02:55,388 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-25 00:02:55,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096453794] [2023-11-25 00:02:55,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:02:55,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-25 00:02:55,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:02:55,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-25 00:02:55,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2023-11-25 00:02:55,394 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-25 00:02:55,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:02:55,769 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2023-11-25 00:02:55,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-25 00:02:55,769 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 13 [2023-11-25 00:02:55,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:02:55,770 INFO L225 Difference]: With dead ends: 27 [2023-11-25 00:02:55,770 INFO L226 Difference]: Without dead ends: 22 [2023-11-25 00:02:55,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=139, Invalid=617, Unknown=0, NotChecked=0, Total=756 [2023-11-25 00:02:55,773 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 36 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:02:55,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 30 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:02:55,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-25 00:02:55,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2023-11-25 00:02:55,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:02:55,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2023-11-25 00:02:55,780 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 13 [2023-11-25 00:02:55,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:02:55,781 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2023-11-25 00:02:55,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-25 00:02:55,782 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2023-11-25 00:02:55,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-25 00:02:55,782 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:02:55,783 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:02:55,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-25 00:02:55,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:02:55,990 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:02:55,990 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:02:55,991 INFO L85 PathProgramCache]: Analyzing trace with hash -382394071, now seen corresponding path program 1 times [2023-11-25 00:02:55,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:02:55,991 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988842221] [2023-11-25 00:02:55,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:02:55,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:02:56,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:02:56,512 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-25 00:02:56,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:02:56,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988842221] [2023-11-25 00:02:56,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988842221] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:02:56,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1620237434] [2023-11-25 00:02:56,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:02:56,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:02:56,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:02:56,518 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:02:56,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-25 00:02:56,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:02:56,603 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 36 conjunts are in the unsatisfiable core [2023-11-25 00:02:56,609 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:02:56,700 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-25 00:02:56,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:02:56,824 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 15 [2023-11-25 00:02:57,109 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:02:57,110 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:02:57,294 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:02:57,295 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 1218 treesize of output 1138 [2023-11-25 00:03:01,177 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,216 INFO L349 Elim1Store]: treesize reduction 13, result has 56.7 percent of original size [2023-11-25 00:03:01,216 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 371 treesize of output 260 [2023-11-25 00:03:01,301 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,302 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,305 WARN L214 Elim1Store]: Array PQE input equivalent to true [2023-11-25 00:03:01,313 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,317 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-11-25 00:03:01,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:01,441 INFO L349 Elim1Store]: treesize reduction 22, result has 63.3 percent of original size [2023-11-25 00:03:01,442 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 355 treesize of output 280 [2023-11-25 00:03:01,526 INFO L349 Elim1Store]: treesize reduction 10, result has 67.7 percent of original size [2023-11-25 00:03:01,526 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 190 treesize of output 146 [2023-11-25 00:03:01,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:01,576 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,587 INFO L349 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-11-25 00:03:01,587 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 1 [2023-11-25 00:03:01,655 INFO L349 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2023-11-25 00:03:01,656 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 635 treesize of output 430 [2023-11-25 00:03:01,713 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,723 INFO L349 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2023-11-25 00:03:01,723 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 265 treesize of output 185 [2023-11-25 00:03:01,790 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,804 INFO L349 Elim1Store]: treesize reduction 45, result has 2.2 percent of original size [2023-11-25 00:03:01,804 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 619 treesize of output 1 [2023-11-25 00:03:01,871 INFO L349 Elim1Store]: treesize reduction 19, result has 38.7 percent of original size [2023-11-25 00:03:01,871 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 190 treesize of output 137 [2023-11-25 00:03:01,940 INFO L349 Elim1Store]: treesize reduction 59, result has 1.7 percent of original size [2023-11-25 00:03:01,941 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 619 treesize of output 1 [2023-11-25 00:03:01,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:01,961 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,975 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:01,986 INFO L349 Elim1Store]: treesize reduction 47, result has 2.1 percent of original size [2023-11-25 00:03:01,987 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 77 treesize of output 1 [2023-11-25 00:03:02,005 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,027 INFO L349 Elim1Store]: treesize reduction 30, result has 3.2 percent of original size [2023-11-25 00:03:02,028 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 1 [2023-11-25 00:03:02,034 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:02,052 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,077 INFO L349 Elim1Store]: treesize reduction 30, result has 3.2 percent of original size [2023-11-25 00:03:02,078 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 80 treesize of output 1 [2023-11-25 00:03:02,085 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,095 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,106 INFO L349 Elim1Store]: treesize reduction 47, result has 2.1 percent of original size [2023-11-25 00:03:02,107 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 106 treesize of output 1 [2023-11-25 00:03:02,119 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,128 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,139 INFO L349 Elim1Store]: treesize reduction 47, result has 2.1 percent of original size [2023-11-25 00:03:02,140 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 84 treesize of output 1 [2023-11-25 00:03:02,146 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:02,161 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:02,173 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:02,189 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,198 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,200 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,210 INFO L349 Elim1Store]: treesize reduction 33, result has 2.9 percent of original size [2023-11-25 00:03:02,210 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 88 treesize of output 1 [2023-11-25 00:03:02,221 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,232 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,233 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,242 INFO L349 Elim1Store]: treesize reduction 33, result has 2.9 percent of original size [2023-11-25 00:03:02,242 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 106 treesize of output 1 [2023-11-25 00:03:02,248 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,249 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,253 WARN L214 Elim1Store]: Array PQE input equivalent to true [2023-11-25 00:03:02,264 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,274 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,275 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,284 INFO L349 Elim1Store]: treesize reduction 33, result has 2.9 percent of original size [2023-11-25 00:03:02,285 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 1 [2023-11-25 00:03:02,295 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,305 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,306 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,317 INFO L349 Elim1Store]: treesize reduction 33, result has 2.9 percent of original size [2023-11-25 00:03:02,318 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 106 treesize of output 1 [2023-11-25 00:03:02,365 INFO L349 Elim1Store]: treesize reduction 59, result has 1.7 percent of original size [2023-11-25 00:03:02,366 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 479 treesize of output 1 [2023-11-25 00:03:02,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:02,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:02,425 INFO L349 Elim1Store]: treesize reduction 30, result has 3.2 percent of original size [2023-11-25 00:03:02,426 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 463 treesize of output 1 [2023-11-25 00:03:02,440 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,456 INFO L349 Elim1Store]: treesize reduction 30, result has 3.2 percent of original size [2023-11-25 00:03:02,457 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 1 [2023-11-25 00:03:02,462 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,472 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,483 INFO L349 Elim1Store]: treesize reduction 47, result has 2.1 percent of original size [2023-11-25 00:03:02,484 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 81 treesize of output 1 [2023-11-25 00:03:02,493 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,503 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,516 INFO L349 Elim1Store]: treesize reduction 47, result has 2.1 percent of original size [2023-11-25 00:03:02,516 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 59 treesize of output 1 [2023-11-25 00:03:02,531 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,532 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,537 WARN L214 Elim1Store]: Array PQE input equivalent to true [2023-11-25 00:03:02,548 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,591 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,598 INFO L349 Elim1Store]: treesize reduction 47, result has 2.1 percent of original size [2023-11-25 00:03:02,599 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 77 treesize of output 1 [2023-11-25 00:03:02,606 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,609 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,613 WARN L214 Elim1Store]: Array PQE input equivalent to true [2023-11-25 00:03:02,626 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,639 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,649 INFO L349 Elim1Store]: treesize reduction 47, result has 2.1 percent of original size [2023-11-25 00:03:02,650 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 88 treesize of output 1 [2023-11-25 00:03:02,660 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,673 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,685 INFO L349 Elim1Store]: treesize reduction 47, result has 2.1 percent of original size [2023-11-25 00:03:02,685 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 84 treesize of output 1 [2023-11-25 00:03:02,693 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:02,731 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,732 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,735 WARN L214 Elim1Store]: Array PQE input equivalent to true [2023-11-25 00:03:02,740 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:02,747 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 69 [2023-11-25 00:03:03,014 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-25 00:03:03,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1620237434] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:03:03,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [777980824] [2023-11-25 00:03:03,019 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-25 00:03:03,019 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:03:03,020 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:03:03,020 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:03:03,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:03:03,459 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 63 for LOIs [2023-11-25 00:03:03,492 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:03:04,679 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '359#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 1 |ULTIMATE.start_main_~S~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-25 00:03:04,679 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:03:04,679 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:03:04,679 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 8] total 21 [2023-11-25 00:03:04,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762245217] [2023-11-25 00:03:04,680 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:03:04,680 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-25 00:03:04,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:04,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-25 00:03:04,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=826, Unknown=0, NotChecked=0, Total=930 [2023-11-25 00:03:04,682 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 21 states, 20 states have (on average 1.5) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-25 00:03:05,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:05,061 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2023-11-25 00:03:05,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-25 00:03:05,062 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.5) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 17 [2023-11-25 00:03:05,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:05,063 INFO L225 Difference]: With dead ends: 22 [2023-11-25 00:03:05,063 INFO L226 Difference]: Without dead ends: 20 [2023-11-25 00:03:05,064 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=179, Invalid=1153, Unknown=0, NotChecked=0, Total=1332 [2023-11-25 00:03:05,064 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 26 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:05,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 54 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:03:05,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-25 00:03:05,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2023-11-25 00:03:05,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:03:05,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-11-25 00:03:05,070 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2023-11-25 00:03:05,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:05,071 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-11-25 00:03:05,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.5) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-25 00:03:05,071 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-11-25 00:03:05,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-25 00:03:05,072 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:05,072 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:05,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-25 00:03:05,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:05,273 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:05,274 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:05,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1643051298, now seen corresponding path program 2 times [2023-11-25 00:03:05,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:05,274 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778059785] [2023-11-25 00:03:05,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:05,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:05,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:05,993 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:03:05,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:05,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778059785] [2023-11-25 00:03:05,994 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778059785] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:05,994 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092907386] [2023-11-25 00:03:05,994 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-25 00:03:05,994 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:05,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:05,998 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:06,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-25 00:03:06,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-25 00:03:06,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:03:06,116 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 40 conjunts are in the unsatisfiable core [2023-11-25 00:03:06,118 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:06,162 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-25 00:03:06,261 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 23 [2023-11-25 00:03:06,540 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:03:06,540 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:03:06,754 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:03:06,754 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 582 treesize of output 550 [2023-11-25 00:03:07,180 INFO L349 Elim1Store]: treesize reduction 12, result has 68.4 percent of original size [2023-11-25 00:03:07,181 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 371 treesize of output 268 [2023-11-25 00:03:07,258 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:07,295 INFO L349 Elim1Store]: treesize reduction 23, result has 39.5 percent of original size [2023-11-25 00:03:07,295 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 38 [2023-11-25 00:03:07,346 INFO L349 Elim1Store]: treesize reduction 27, result has 28.9 percent of original size [2023-11-25 00:03:07,347 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 306 treesize of output 228 [2023-11-25 00:03:07,386 INFO L349 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-11-25 00:03:07,387 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 306 treesize of output 210 [2023-11-25 00:03:07,413 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:07,413 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 121 treesize of output 93 [2023-11-25 00:03:07,477 INFO L349 Elim1Store]: treesize reduction 27, result has 28.9 percent of original size [2023-11-25 00:03:07,477 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 186 treesize of output 136 [2023-11-25 00:03:07,535 INFO L349 Elim1Store]: treesize reduction 17, result has 55.3 percent of original size [2023-11-25 00:03:07,535 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 371 treesize of output 263 [2023-11-25 00:03:07,652 INFO L349 Elim1Store]: treesize reduction 23, result has 39.5 percent of original size [2023-11-25 00:03:07,652 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 306 treesize of output 232 [2023-11-25 00:03:07,678 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:07,685 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:07,691 INFO L349 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2023-11-25 00:03:07,692 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 46 treesize of output 1 [2023-11-25 00:03:07,710 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:07,718 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:07,724 INFO L349 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2023-11-25 00:03:07,725 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 46 treesize of output 1 [2023-11-25 00:03:07,750 INFO L349 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-11-25 00:03:07,751 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 186 treesize of output 118 [2023-11-25 00:03:07,778 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:07,793 INFO L349 Elim1Store]: treesize reduction 37, result has 2.6 percent of original size [2023-11-25 00:03:07,793 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 1 [2023-11-25 00:03:07,823 INFO L349 Elim1Store]: treesize reduction 37, result has 2.6 percent of original size [2023-11-25 00:03:07,824 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 491 treesize of output 1 [2023-11-25 00:03:07,853 INFO L349 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2023-11-25 00:03:07,853 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 76 [2023-11-25 00:03:07,861 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-25 00:03:07,866 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 43 [2023-11-25 00:03:07,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,883 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 25 [2023-11-25 00:03:07,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,900 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 25 [2023-11-25 00:03:07,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,916 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 25 [2023-11-25 00:03:07,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,932 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 25 [2023-11-25 00:03:07,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:07,947 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 51 [2023-11-25 00:03:07,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:08,221 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-25 00:03:08,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092907386] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:03:08,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1452958232] [2023-11-25 00:03:08,223 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-25 00:03:08,223 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:03:08,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:03:08,224 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:03:08,224 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:03:08,593 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 63 for LOIs [2023-11-25 00:03:08,623 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:03:09,844 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '577#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 1 |ULTIMATE.start_main_~S~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-25 00:03:09,845 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:03:09,845 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:03:09,845 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 9] total 23 [2023-11-25 00:03:09,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993490365] [2023-11-25 00:03:09,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:03:09,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-25 00:03:09,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:09,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-25 00:03:09,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=947, Unknown=0, NotChecked=0, Total=1056 [2023-11-25 00:03:09,849 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 23 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-25 00:03:11,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:11,028 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2023-11-25 00:03:11,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-25 00:03:11,029 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 20 [2023-11-25 00:03:11,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:11,030 INFO L225 Difference]: With dead ends: 46 [2023-11-25 00:03:11,030 INFO L226 Difference]: Without dead ends: 44 [2023-11-25 00:03:11,032 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=359, Invalid=2191, Unknown=0, NotChecked=0, Total=2550 [2023-11-25 00:03:11,033 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 60 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:11,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 89 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-25 00:03:11,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-25 00:03:11,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 24. [2023-11-25 00:03:11,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:03:11,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-11-25 00:03:11,042 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 20 [2023-11-25 00:03:11,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:11,043 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-11-25 00:03:11,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-25 00:03:11,043 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-11-25 00:03:11,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-25 00:03:11,044 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:11,044 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:11,054 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-25 00:03:11,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:11,250 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:11,251 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:11,251 INFO L85 PathProgramCache]: Analyzing trace with hash 453452158, now seen corresponding path program 3 times [2023-11-25 00:03:11,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:11,251 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48506222] [2023-11-25 00:03:11,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:11,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:11,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:12,154 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-25 00:03:12,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:12,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48506222] [2023-11-25 00:03:12,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48506222] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:12,156 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873785845] [2023-11-25 00:03:12,156 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-25 00:03:12,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:12,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:12,162 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:12,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc95b7c-465c-48f7-aa36-0ea983ca8264/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-25 00:03:12,277 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-25 00:03:12,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:03:12,279 INFO L262 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 44 conjunts are in the unsatisfiable core [2023-11-25 00:03:12,282 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:12,290 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-25 00:03:12,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:12,410 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 15 [2023-11-25 00:03:12,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:12,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-25 00:03:12,473 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 18 [2023-11-25 00:03:12,985 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-25 00:03:12,986 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:03:13,403 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-25 00:03:13,404 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 27942 treesize of output 26550